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Fencer Vulns
high 7.8

CVE-2026-23209 json

macvlan: fix error recovery in macvlan_common_newlink()

published 2026-02-14 8 mo ago modified 2026-10-19 20 d ago also EUVD-2026-5839

cvss
7.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 7%
public exploits
0
none known

Summary

In the Linux kernel, the following vulnerability has been resolved:

macvlan: fix error recovery in macvlan_common_newlink()

valis provided a nice repro to crash the kernel:

ip link add p1 type veth peer p2 ip link set address 00:00:00:00:00:20 dev p1 ip link set up dev p1 ip link set up dev p2

ip link add mv0 link p2 type macvlan mode source ip link add invalid% link p2 type macvlan mode source macaddr add 00:00:00:00:00:20

ping -c1 -I p1 1.2.3.4

He also gave a very detailed analysis:

<quote valis>

The issue is triggered when a new macvlan link is created with MACVLAN_MODE_SOURCE mode and MACVLAN_MACADDR_ADD (or MACVLAN_MACADDR_SET) parameter, lower device already has a macvlan port and register_netdevice() called from macvlan_common_newlink() fails (e.g. because of the invalid link name).

In this case macvlan_hash_add_source is called from macvlan_change_sources() / macvlan_common_newlink():

This adds a reference to vlan to the port's vlan_source_hash using macvlan_source_entry.

vlan is a pointer to the priv data of the link that is being created.

When register_netdevice() fails, the error is returned from macvlan_newlink() to rtnl_newlink_create():

if (ops->newlink) err = ops->newlink(dev, &params, extack); else err = register_netdevice(dev); if (err < 0) { free_netdev(dev); goto out; }

and free_netdev() is called, causing a kvfree() on the struct net_device that is still referenced in the source entry attached to the lower device's macvlan port.

Now all packets sent on the macvlan port with a matching source mac address will trigger a use-after-free in macvlan_forward_source().

</quote valis>

With all that, my fix is to make sure we call macvlan_flush_sources() regardless of @create value whenever "goto destroy_macvlan_port;" path is taken.

Many thanks to valis for following up on this issue.

Patch / fix

  • Linux Linux 5.10.250, 5.15.200, 6.1.163, 6.6.124, 6.12.70, 6.18.10, 6.19
  • linux Debian 12 6.1.164-1
  • linux Debian 13 6.12.73-1
  • linux Debian 14 6.18.10-1

debian advisories DEBIAN-CVE-2026-23209

  • linux Ubuntu 22.04 LTS 5.15.0-176.186
  • linux Ubuntu 24.04 LTS 6.8.0-110.110
  • linux Ubuntu 25.10 6.17.0-22.22
  • linux-aws Ubuntu 22.04 LTS 5.15.0-1105.112
  • linux-aws Ubuntu 24.04 LTS 6.8.0-1052.55
  • linux-aws Ubuntu 25.10 6.17.0-1012.12
  • linux-gcp Ubuntu 22.04 LTS 5.15.0-1105.114
  • linux-gcp Ubuntu 24.04 LTS 6.8.0-1054.57

ubuntu advisories UBUNTU-CVE-2026-23209

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • kernel RHEL 10.1 6.12.0-124.49.1.el10_1
  • rv RHEL 10.1 6.12.0-124.49.1.el10_1
  • perf RHEL 10.1 6.12.0-124.49.1.el10_1
  • rtla RHEL 10.1 6.12.0-124.49.1.el10_1
  • libperf RHEL 10.1 6.12.0-124.49.1.el10_1
  • kernel-rt RHEL 10.1 6.12.0-124.49.1.el10_1
  • kernel-64k RHEL 10.1 6.12.0-124.49.1.el10_1
  • kernel-core RHEL 10.1 6.12.0-124.49.1.el10_1

red hat advisories RHSA-2026:9644RHSA-2026:9512RHSA-2026:7100RHSA-2026:7013RHSA-2026:7003RHSA-2026:6961

  • kernel-default SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Live Patching 15 SP6 +1 more 6.4.0-150600.23.112.1
  • kernel-64kb SLE Module for Basesystem 15 SP7 6.4.0-150700.53.55.1
  • kernel-syms SLE Module for Development Tools 15 SP7 6.4.0-150700.53.55.1
  • kernel-azure SLE Module for Public Cloud 15 SP7 6.4.0-150700.53.55.1
  • kernel-source SLE Module for Development Tools 15 SP7, SLE Module for Basesystem 15 SP7 6.4.0-150700.53.55.1
  • kernel-default SLE Workstation Extension 15 SP7, SLE Module for Legacy 15 SP7, SLE Module for Basesystem 15 SP7 +2 more 6.4.0-150700.53.55.1
  • kernel-zfcpdump SLE Module for Basesystem 15 SP7 6.4.0-150700.53.55.1
  • kernel-obs-build SLE Module for Development Tools 15 SP7 6.4.0-150700.53.55.1

suse advisories SUSE-SU-2026:2195-1SUSE-SU-2026:2238-1SUSE-SU-2026:21834-1SUSE-SU-2026:1305-1SUSE-SU-2026:1304-1SUSE-SU-2026:1298-1

  • kernel-rt openSUSE Leap 16.0 6.12.0-160000.27.1
  • dtb-aarch64 openSUSE Leap 16.0 6.12.0-160000.27.1
  • kernel-64kb openSUSE Leap 16.0 6.12.0-160000.27.1
  • kernel-syms openSUSE Leap 16.0 6.12.0-160000.27.1
  • kernel-azure openSUSE Leap 16.0 6.12.0-160000.27.1
  • kernel-obs-qa openSUSE Leap 16.0 6.12.0-160000.27.1
  • kernel-source openSUSE Leap 16.0 6.12.0-160000.27.1
  • kernel-default openSUSE Leap 16.0 6.12.0-160000.27.1

opensuse advisories openSUSE-SU-2026:20416-1

  • kernel-abi-stablelists AlmaLinux 10 6.12.0-124.49.1.el10_1
  • kernel-rt AlmaLinux 8 4.18.0-553.115.1.rt7.456.el8_10
  • kernel-rt-core AlmaLinux 8 4.18.0-553.115.1.rt7.456.el8_10
  • kernel-rt-modules AlmaLinux 8 4.18.0-553.115.1.rt7.456.el8_10
  • kernel-rt-debug-core AlmaLinux 8 4.18.0-553.115.1.rt7.456.el8_10
  • kernel-rt-debug-modules AlmaLinux 8 4.18.0-553.115.1.rt7.456.el8_10
  • kernel-rt-modules-extra AlmaLinux 8 4.18.0-553.115.1.rt7.456.el8_10
  • kernel-rt-debug-modules-extra AlmaLinux 8 4.18.0-553.115.1.rt7.456.el8_10

almalinux advisories ALSA-2026:6632ALSA-2026:6036ALSA-2026:6037ALSA-2026:6153

  • kernel Rocky Linux 10 6.12.0-124.49.1.el10_1
  • kernel Rocky Linux 9 5.14.0-611.45.1.el9_7
  • kernel-rt Rocky Linux 8 4.18.0-553.115.1.rt7.456.el8_10
  • kernel Rocky Linux 8 4.18.0-553.115.1.el8_10

rocky linux advisories RLSA-2026:6632RLSA-2026:6153RLSA-2026:6036RLSA-2026:6037

  • kernel Azure Linux 3.0 6.6.126.1-1

azure linux advisories AZL-77739

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-23209 updated cvss 7.0

kernel: macvlan: fix error recovery in macvlan_common_newlink()

  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more
    affected: workaround, no fix planned “To mitigate this issue, prevent module macvlan from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.”
  • Red Hat Enterprise Linux 9 kernel-rt, kernel-rt-kvm, kernel-rt-core, kernel-rt-modules, kernel-rt-debug-kvm, kernel-rt-debug-core, +12 more
    affected: workaround, no fix available “To mitigate this issue, prevent module macvlan from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.”
  • Red Hat CodeReady Linux Builder EUS (v.9.4) libperf 5.14.0-427.117.1.el9_4, kernel-debuginfo-common-s390x 5.14.0-427.117.1.el9_4, kernel-debuginfo-common-x86_64 5.14.0-427.117.1.el9_4, kernel-debuginfo-common-aarch64 5.14.0-427.117.1.el9_4, kernel-debuginfo-common-ppc64le 5.14.0-427.117.1.el9_4
    fixed: vendor fix “To mitigate this issue, prevent module macvlan from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:6310
  • Red Hat CodeReady Linux Builder EUS (v.9.6) libperf 5.14.0-570.103.1.el9_6, kernel-debuginfo-common-s390x 5.14.0-570.103.1.el9_6, kernel-debuginfo-common-x86_64 5.14.0-570.103.1.el9_6, kernel-debuginfo-common-aarch64 5.14.0-570.103.1.el9_6, kernel-debuginfo-common-ppc64le 5.14.0-570.103.1.el9_6
    fixed: vendor fix “To mitigate this issue, prevent module macvlan from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:6164
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-611.45.1.el9_7, perf 5.14.0-611.45.1.el9_7, rtla 5.14.0-611.45.1.el9_7, python3-perf 5.14.0-611.45.1.el9_7, kernel-devel-matched 5.14.0-611.45.1.el9_7, kernel-64k-devel-matched 5.14.0-611.45.1.el9_7, +7 more
    fixed: vendor fix “To mitigate this issue, prevent module macvlan from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:6153
  • Red Hat Enterprise Linux AppStream (v. 10) rv 6.12.0-124.49.1.el10_1, perf 6.12.0-124.49.1.el10_1, rtla 6.12.0-124.49.1.el10_1, python3-perf 6.12.0-124.49.1.el10_1, kernel-devel-matched 6.12.0-124.49.1.el10_1, kernel-64k-devel-matched 6.12.0-124.49.1.el10_1, +7 more
    fixed: vendor fix “To mitigate this issue, prevent module macvlan from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:6632
  • Red Hat Enterprise Linux AppStream E4S (v.9.0) perf 5.14.0-70.173.1.el9_0, kernel-devel-matched 5.14.0-70.173.1.el9_0, kernel-debug-devel-matched 5.14.0-70.173.1.el9_0, kernel-debuginfo-common-s390x 5.14.0-70.173.1.el9_0, kernel-zfcpdump-devel-matched 5.14.0-70.173.1.el9_0, kernel-debuginfo-common-x86_64 5.14.0-70.173.1.el9_0, +2 more
    fixed: vendor fix “To mitigate this issue, prevent module macvlan from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:7013
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) perf 5.14.0-284.166.1.el9_2, rtla 5.14.0-284.166.1.el9_2, kernel-devel-matched 5.14.0-284.166.1.el9_2, kernel-64k-devel-matched 5.14.0-284.166.1.el9_2, kernel-debug-devel-matched 5.14.0-284.166.1.el9_2, kernel-debuginfo-common-s390x 5.14.0-284.166.1.el9_2, +5 more
    fixed: vendor fix “To mitigate this issue, prevent module macvlan from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:9644
show 31 more
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) rv 6.12.0-55.66.1.el10_0, perf 6.12.0-55.66.1.el10_0, rtla 6.12.0-55.66.1.el10_0, python3-perf 6.12.0-55.66.1.el10_0, kernel-devel-matched 6.12.0-55.66.1.el10_0, kernel-64k-devel-matched 6.12.0-55.66.1.el10_0, +7 more
    fixed: vendor fix “To mitigate this issue, prevent module macvlan from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:6692
  • Red Hat Enterprise Linux AppStream EUS (v.9.4) rv 5.14.0-427.117.1.el9_4, perf 5.14.0-427.117.1.el9_4, rtla 5.14.0-427.117.1.el9_4, kernel-devel-matched 5.14.0-427.117.1.el9_4, kernel-64k-devel-matched 5.14.0-427.117.1.el9_4, kernel-debug-devel-matched 5.14.0-427.117.1.el9_4, +6 more
    fixed: vendor fix “To mitigate this issue, prevent module macvlan from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:6310
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) rv 5.14.0-570.103.1.el9_6, perf 5.14.0-570.103.1.el9_6, rtla 5.14.0-570.103.1.el9_6, python3-perf 5.14.0-570.103.1.el9_6, kernel-devel-matched 5.14.0-570.103.1.el9_6, kernel-64k-devel-matched 5.14.0-570.103.1.el9_6, +7 more
    fixed: vendor fix “To mitigate this issue, prevent module macvlan from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:6164
  • Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-553.115.1.el8_10, kernel 4.18.0-553.115.1.el8_10, bpftool 4.18.0-553.115.1.el8_10, kernel-core 4.18.0-553.115.1.el8_10, kernel-tools 4.18.0-553.115.1.el8_10, python3-perf 4.18.0-553.115.1.el8_10, +15 more
    fixed: vendor fix “To mitigate this issue, prevent module macvlan from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:6037
  • Red Hat Enterprise Linux BaseOS (v. 9) kernel 5.14.0-611.45.1.el9_7, kernel-64k 5.14.0-611.45.1.el9_7, kernel-core 5.14.0-611.45.1.el9_7, kernel-tools 5.14.0-611.45.1.el9_7, kernel-modules 5.14.0-611.45.1.el9_7, kernel-64k-core 5.14.0-611.45.1.el9_7, +27 more
    fixed: vendor fix “To mitigate this issue, prevent module macvlan from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:6153
  • Red Hat Enterprise Linux BaseOS (v. 10) kernel 6.12.0-124.49.1.el10_1, kernel-64k 6.12.0-124.49.1.el10_1, kernel-core 6.12.0-124.49.1.el10_1, kernel-tools 6.12.0-124.49.1.el10_1, kernel-modules 6.12.0-124.49.1.el10_1, kernel-64k-core 6.12.0-124.49.1.el10_1, +28 more
    fixed: vendor fix “To mitigate this issue, prevent module macvlan from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:6632
  • Red Hat Enterprise Linux BaseOS AUS (v. 8.2) perf 4.18.0-193.193.1.el8_2, kernel 4.18.0-193.193.1.el8_2, bpftool 4.18.0-193.193.1.el8_2, kernel-core 4.18.0-193.193.1.el8_2, kernel-tools 4.18.0-193.193.1.el8_2, python3-perf 4.18.0-193.193.1.el8_2, +8 more
    fixed: vendor fix “To mitigate this issue, prevent module macvlan from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:6953
  • Red Hat Enterprise Linux BaseOS AUS (v.8.4) perf 4.18.0-305.188.1.el8_4, kernel 4.18.0-305.188.1.el8_4, bpftool 4.18.0-305.188.1.el8_4, kernel-core 4.18.0-305.188.1.el8_4, kernel-tools 4.18.0-305.188.1.el8_4, python3-perf 4.18.0-305.188.1.el8_4, +8 more
    fixed: vendor fix “To mitigate this issue, prevent module macvlan from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:7003
  • Red Hat Enterprise Linux BaseOS AUS (v.8.6) perf 4.18.0-372.187.1.el8_6, kernel 4.18.0-372.187.1.el8_6, bpftool 4.18.0-372.187.1.el8_6, kernel-core 4.18.0-372.187.1.el8_6, kernel-tools 4.18.0-372.187.1.el8_6, python3-perf 4.18.0-372.187.1.el8_6, +8 more Red Hat Enterprise Linux BaseOS E4S (v.8.6) perf 4.18.0-372.187.1.el8_6, kernel 4.18.0-372.187.1.el8_6, bpftool 4.18.0-372.187.1.el8_6, kernel-core 4.18.0-372.187.1.el8_6, kernel-tools 4.18.0-372.187.1.el8_6, python3-perf 4.18.0-372.187.1.el8_6, +15 more
    fixed: vendor fix “To mitigate this issue, prevent module macvlan from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:6961
  • Red Hat Enterprise Linux BaseOS E4S (v.8.8) perf 4.18.0-477.135.1.el8_8, kernel 4.18.0-477.135.1.el8_8, bpftool 4.18.0-477.135.1.el8_8, kernel-core 4.18.0-477.135.1.el8_8, kernel-tools 4.18.0-477.135.1.el8_8, python3-perf 4.18.0-477.135.1.el8_8, +9 more
    fixed: vendor fix “To mitigate this issue, prevent module macvlan from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:6954
  • Red Hat Enterprise Linux BaseOS E4S (v.9.0) kernel 5.14.0-70.173.1.el9_0, bpftool 5.14.0-70.173.1.el9_0, kernel-core 5.14.0-70.173.1.el9_0, kernel-tools 5.14.0-70.173.1.el9_0, python3-perf 5.14.0-70.173.1.el9_0, kernel-modules 5.14.0-70.173.1.el9_0, +14 more
    fixed: vendor fix “To mitigate this issue, prevent module macvlan from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:7013
  • Red Hat Enterprise Linux BaseOS E4S (v.9.2) bpftool 7.0.0-284.166.1.el9_2, kernel 5.14.0-284.166.1.el9_2, kernel-64k 5.14.0-284.166.1.el9_2, kernel-core 5.14.0-284.166.1.el9_2, kernel-tools 5.14.0-284.166.1.el9_2, python3-perf 5.14.0-284.166.1.el9_2, +28 more
    fixed: vendor fix “To mitigate this issue, prevent module macvlan from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:9644
  • Red Hat Enterprise Linux BaseOS EUS (v. 10.0) kernel 6.12.0-55.66.1.el10_0, kernel-64k 6.12.0-55.66.1.el10_0, kernel-core 6.12.0-55.66.1.el10_0, kernel-tools 6.12.0-55.66.1.el10_0, kernel-modules 6.12.0-55.66.1.el10_0, kernel-64k-core 6.12.0-55.66.1.el10_0, +27 more
    fixed: vendor fix “To mitigate this issue, prevent module macvlan from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:6692
  • Red Hat Enterprise Linux BaseOS EUS (v.9.4) bpftool 7.3.0-427.117.1.el9_4, kernel 5.14.0-427.117.1.el9_4, kernel-64k 5.14.0-427.117.1.el9_4, kernel-core 5.14.0-427.117.1.el9_4, kernel-tools 5.14.0-427.117.1.el9_4, python3-perf 5.14.0-427.117.1.el9_4, +28 more
    fixed: vendor fix “To mitigate this issue, prevent module macvlan from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:6310
  • Red Hat Enterprise Linux BaseOS EUS (v.9.6) kernel 5.14.0-570.103.1.el9_6, kernel-64k 5.14.0-570.103.1.el9_6, kernel-core 5.14.0-570.103.1.el9_6, kernel-tools 5.14.0-570.103.1.el9_6, kernel-modules 5.14.0-570.103.1.el9_6, kernel-64k-core 5.14.0-570.103.1.el9_6, +27 more
    fixed: vendor fix “To mitigate this issue, prevent module macvlan from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:6164
  • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) perf 4.18.0-305.188.1.el8_4, kernel 4.18.0-305.188.1.el8_4, bpftool 4.18.0-305.188.1.el8_4, kernel-core 4.18.0-305.188.1.el8_4, kernel-tools 4.18.0-305.188.1.el8_4, python3-perf 4.18.0-305.188.1.el8_4, +8 more
    fixed: vendor fix “To mitigate this issue, prevent module macvlan from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:7003
  • Red Hat Enterprise Linux BaseOS TUS (v.8.6) perf 4.18.0-372.187.1.el8_6, kernel 4.18.0-372.187.1.el8_6, bpftool 4.18.0-372.187.1.el8_6, kernel-core 4.18.0-372.187.1.el8_6, kernel-tools 4.18.0-372.187.1.el8_6, python3-perf 4.18.0-372.187.1.el8_6, +8 more
    fixed: vendor fix “To mitigate this issue, prevent module macvlan from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:6961
  • Red Hat Enterprise Linux BaseOS TUS (v.8.8) perf 4.18.0-477.135.1.el8_8, kernel 4.18.0-477.135.1.el8_8, bpftool 4.18.0-477.135.1.el8_8, kernel-core 4.18.0-477.135.1.el8_8, kernel-tools 4.18.0-477.135.1.el8_8, python3-perf 4.18.0-477.135.1.el8_8, +8 more
    fixed: vendor fix “To mitigate this issue, prevent module macvlan from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:6954
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libperf 5.14.0-611.45.1.el9_7, kernel-debuginfo-common-s390x 5.14.0-611.45.1.el9_7, kernel-debuginfo-common-x86_64 5.14.0-611.45.1.el9_7, kernel-debuginfo-common-aarch64 5.14.0-611.45.1.el9_7, kernel-debuginfo-common-ppc64le 5.14.0-611.45.1.el9_7
    fixed: vendor fix “To mitigate this issue, prevent module macvlan from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:6153
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libperf 6.12.0-124.49.1.el10_1, kernel-debuginfo-common-s390x 6.12.0-124.49.1.el10_1, kernel-debuginfo-common-x86_64 6.12.0-124.49.1.el10_1, kernel-debuginfo-common-aarch64 6.12.0-124.49.1.el10_1, kernel-debuginfo-common-ppc64le 6.12.0-124.49.1.el10_1
    fixed: vendor fix “To mitigate this issue, prevent module macvlan from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:6632
  • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) libperf 6.12.0-55.66.1.el10_0, kernel-debuginfo-common-s390x 6.12.0-55.66.1.el10_0, kernel-debuginfo-common-x86_64 6.12.0-55.66.1.el10_0, kernel-debuginfo-common-aarch64 6.12.0-55.66.1.el10_0, kernel-debuginfo-common-ppc64le 6.12.0-55.66.1.el10_0
    fixed: vendor fix “To mitigate this issue, prevent module macvlan from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:6692
  • Red Hat Enterprise Linux CRB (v. 8) kernel-debuginfo-common-x86_64 4.18.0-553.115.1.el8_10, kernel-debuginfo-common-aarch64 4.18.0-553.115.1.el8_10, kernel-debuginfo-common-ppc64le 4.18.0-553.115.1.el8_10
    fixed: vendor fix “To mitigate this issue, prevent module macvlan from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:6037
  • Red Hat Enterprise Linux NFV (v. 8) kernel-rt 4.18.0-553.115.1.rt7.456.el8_10, kernel-rt-kvm 4.18.0-553.115.1.rt7.456.el8_10, kernel-rt-core 4.18.0-553.115.1.rt7.456.el8_10, kernel-rt-modules 4.18.0-553.115.1.rt7.456.el8_10, kernel-rt-debug-kvm 4.18.0-553.115.1.rt7.456.el8_10, kernel-rt-debug-core 4.18.0-553.115.1.rt7.456.el8_10, +4 more
    fixed: vendor fix “To mitigate this issue, prevent module macvlan from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:6036
  • Red Hat Enterprise Linux NFV E4S (v.9.0) kernel-rt 5.14.0-70.173.1.rt21.245.el9_0, kernel-rt-kvm 5.14.0-70.173.1.rt21.245.el9_0, kernel-rt-core 5.14.0-70.173.1.rt21.245.el9_0, kernel-rt-modules 5.14.0-70.173.1.rt21.245.el9_0, kernel-rt-debug-kvm 5.14.0-70.173.1.rt21.245.el9_0, kernel-rt-debug-core 5.14.0-70.173.1.rt21.245.el9_0, +4 more
    fixed: vendor fix “To mitigate this issue, prevent module macvlan from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:7100
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-611.45.1.el9_7, kernel-rt-64k 5.14.0-611.45.1.el9_7, kernel-rt-core 5.14.0-611.45.1.el9_7, kernel-rt-modules 5.14.0-611.45.1.el9_7, kernel-rt-64k-core 5.14.0-611.45.1.el9_7, kernel-rt-debug-core 5.14.0-611.45.1.el9_7, +14 more
    fixed: vendor fix “To mitigate this issue, prevent module macvlan from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:6153
  • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt 6.12.0-124.49.1.el10_1, kernel-rt-64k 6.12.0-124.49.1.el10_1, kernel-rt-core 6.12.0-124.49.1.el10_1, kernel-rt-modules 6.12.0-124.49.1.el10_1, kernel-rt-64k-core 6.12.0-124.49.1.el10_1, kernel-rt-debug-core 6.12.0-124.49.1.el10_1, +14 more
    fixed: vendor fix “To mitigate this issue, prevent module macvlan from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:6632
  • Red Hat Enterprise Linux Real Time E4S (v.9.0) kernel-rt 5.14.0-70.173.1.rt21.245.el9_0, kernel-rt-core 5.14.0-70.173.1.rt21.245.el9_0, kernel-rt-modules 5.14.0-70.173.1.rt21.245.el9_0, kernel-rt-debug-core 5.14.0-70.173.1.rt21.245.el9_0, kernel-rt-debug-modules 5.14.0-70.173.1.rt21.245.el9_0, kernel-rt-modules-extra 5.14.0-70.173.1.rt21.245.el9_0, +2 more
    fixed: vendor fix “To mitigate this issue, prevent module macvlan from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:7100
  • Red Hat Enterprise Linux Real Time E4S (v.9.2) kernel-rt 5.14.0-284.166.1.rt14.451.el9_2, kernel-rt-core 5.14.0-284.166.1.rt14.451.el9_2, kernel-rt-modules 5.14.0-284.166.1.rt14.451.el9_2, kernel-rt-debug-core 5.14.0-284.166.1.rt14.451.el9_2, kernel-rt-modules-core 5.14.0-284.166.1.rt14.451.el9_2, kernel-rt-debug-modules 5.14.0-284.166.1.rt14.451.el9_2, +4 more
    fixed: vendor fix “To mitigate this issue, prevent module macvlan from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:9512
  • Red Hat Enterprise Linux Real Time EUS (v. 10.0) kernel-rt 6.12.0-55.66.1.el10_0, kernel-rt-64k 6.12.0-55.66.1.el10_0, kernel-rt-core 6.12.0-55.66.1.el10_0, kernel-rt-modules 6.12.0-55.66.1.el10_0, kernel-rt-64k-core 6.12.0-55.66.1.el10_0, kernel-rt-debug-core 6.12.0-55.66.1.el10_0, +14 more
    fixed: vendor fix “To mitigate this issue, prevent module macvlan from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:6692
  • Red Hat Enterprise Linux Real Time EUS (v.9.4) kernel-rt 5.14.0-427.117.1.el9_4, kernel-rt-core 5.14.0-427.117.1.el9_4, kernel-rt-modules 5.14.0-427.117.1.el9_4, kernel-rt-debug-core 5.14.0-427.117.1.el9_4, kernel-rt-modules-core 5.14.0-427.117.1.el9_4, kernel-rt-debug-modules 5.14.0-427.117.1.el9_4, +4 more
    fixed: vendor fix “To mitigate this issue, prevent module macvlan from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:6310
  • Red Hat Enterprise Linux Real Time EUS (v.9.6) kernel-rt 5.14.0-570.103.1.el9_6, kernel-rt-64k 5.14.0-570.103.1.el9_6, kernel-rt-core 5.14.0-570.103.1.el9_6, kernel-rt-modules 5.14.0-570.103.1.el9_6, kernel-rt-64k-core 5.14.0-570.103.1.el9_6, kernel-rt-debug-core 5.14.0-570.103.1.el9_6, +14 more
    fixed: vendor fix “To mitigate this issue, prevent module macvlan from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:6164

7 more fixed, 1 more not affected in the full advisory

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
4 mo ago

Exploit prediction

0.18% chance of exploitation in the next 30 days, higher than 7% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

  • Linux Linux

Classification

Weakness
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.