Skip to content
Fencer Vulns
high 7.8

CVE-2026-64189 json

netfilter: ipset: fix race between dump and ip_set_list resize

published 2026-07-20 3 mo ago modified 2026-10-19 20 d ago also EUVD-2026-46009

cvss
7.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 2%
public exploits
0
none known

Summary

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

netfilter: ipset: fix race between dump and ip_set_list resize

The release path of ip_set_dump_do() and ip_set_dump_done() read inst->ip_set_list via ip_set_ref_netlink(), a plain rcu_dereference_raw() of the array pointer. These run from netlink_recvmsg() without the nfnl mutex and without an RCU read-side critical section.

A concurrent ip_set_create() can grow the array: it publishes the new array, calls synchronize_net() and then kvfree()s the old one. Since the dump paths read the array outside any RCU reader, synchronize_net() does not wait for them and the old array can be freed while they still index into it, causing a use-after-free.

The dumped set itself stays pinned via set->ref_netlink, so only the array load needs protecting. Take rcu_read_lock() around it, matching ip_set_get_byname() and __ip_set_put_byindex().

BUG: KASAN: slab-use-after-free in ip_set_dump_do (net/netfilter/ipset/ip_set_core.c:1697) Read of size 8 at addr ffff88800b5c4018 by task exploit/150 Call Trace: ... kasan_report (mm/kasan/report.c:595) ip_set_dump_do (net/netfilter/ipset/ip_set_core.c:1697) netlink_dump (net/netlink/af_netlink.c:2325) netlink_recvmsg (net/netlink/af_netlink.c:1976) sock_recvmsg (net/socket.c:1159) __sys_recvfrom (net/socket.c:2315) ... Oops: general protection fault, probably for non-canonical address ... KASAN NOPTI KASAN: maybe wild-memory-access in range [0x02d6...d0-0x02d6...d7] RIP: 0010:ip_set_dump_do (net/netfilter/ipset/ip_set_core.c:1698) Kernel panic - not syncing: Fatal exception

Patch / fix

  • Linux Linux 4.20, 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.96, 6.18.39, 7.1.4, 7.2
  • linux Debian 12 6.1.180-1
  • linux Debian 13 6.12.96-1
  • linux Debian 14 7.1.4-1
  • linux-6.12 Debian 12 6.12.100-1~deb12u1

debian advisories DEBIAN-CVE-2026-64189

  • linux Ubuntu 22.04 LTS 5.15.0-198.208
  • linux Ubuntu 24.04 LTS 6.8.0-147.147
  • linux Ubuntu 26.04 LTS 7.0.0-31.31
  • linux-aws Ubuntu 22.04 LTS 5.15.0-1117.124
  • linux-aws Ubuntu 24.04 LTS 6.8.0-1067.70
  • linux-aws Ubuntu 26.04 LTS 7.0.0-1012.12
  • linux-gcp Ubuntu 22.04 LTS 5.15.0-1118.128
  • linux-gcp Ubuntu 24.04 LTS 6.8.0-1071.79

ubuntu advisories UBUNTU-CVE-2026-64189

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 10.2 6.12.0-211.50.1.el10_2
  • rv RHEL 10.2 6.12.0-211.50.1.el10_2
  • perf RHEL 10.2 6.12.0-211.50.1.el10_2
  • rtla RHEL 10.2 6.12.0-211.50.1.el10_2
  • libperf RHEL 10.2 6.12.0-211.50.1.el10_2
  • kernel-rt RHEL 10.2 6.12.0-211.50.1.el10_2
  • kernel-64k RHEL 10.2 6.12.0-211.50.1.el10_2
  • kernel-core RHEL 10.2 6.12.0-211.50.1.el10_2

red hat advisories RHSA-2026:61887RHSA-2026:59737RHSA-2026:59821RHSA-2026:59723

  • kernel-livepatch-SLE16_Update_5 SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 12-160000.1.1
  • kernel-livepatch-SLE16_Update_9 SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 8-160000.1.1
  • kernel-livepatch-SLE16_Update_0 SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 19-160000.4.3
  • kernel-livepatch-MICRO-6-0-RT_Update_18 Linux Micro 6.1, Linux Micro 6.0 11-1.1
  • kernel-livepatch-MICRO-6-0-RT_Update_15 Linux Micro 6.1, Linux Micro 6.0 12-1.1
  • kernel-livepatch-MICRO-6-0-RT_Update_14 Linux Micro 6.1, Linux Micro 6.0 13-1.1
  • kernel-livepatch-MICRO-6-0-RT_Update_13 Linux Micro 6.1, Linux Micro 6.0 13-1.1
  • kernel-livepatch-MICRO-6-0-RT_Update_12 Linux Micro 6.1, Linux Micro 6.0 17-1.1

suse advisories SUSE-SU-2026:24107-1SUSE-SU-2026:24108-1SUSE-SU-2026:24174-1SUSE-SU-2026:24175-1SUSE-SU-2026:24106-1SUSE-SU-2026:24173-1

  • kernel-rt openSUSE Leap 16.0 6.12.0-160000.37.1
  • dtb-aarch64 openSUSE Leap 16.0 6.12.0-160000.37.1
  • kernel-64kb openSUSE Leap 16.0 6.12.0-160000.37.1
  • kernel-syms openSUSE Leap 16.0 6.12.0-160000.37.1
  • kernel-azure openSUSE Leap 16.0 6.12.0-160000.37.1
  • kernel-obs-qa openSUSE Leap 16.0 6.12.0-160000.37.1
  • kernel-source openSUSE Leap 16.0 6.12.0-160000.37.1
  • kernel-default openSUSE Leap 16.0 6.12.0-160000.37.1

opensuse advisories openSUSE-SU-2026:21555-1openSUSE-SU-2026:11476-1

  • kernel AlmaLinux 10 6.12.0-211.50.1.el10_2
  • rv AlmaLinux 10 6.12.0-211.50.1.el10_2
  • perf AlmaLinux 10 6.12.0-211.50.1.el10_2
  • rtla AlmaLinux 10 6.12.0-211.50.1.el10_2
  • libperf AlmaLinux 10 6.12.0-211.50.1.el10_2
  • kernel-rt AlmaLinux 10 6.12.0-211.50.1.el10_2
  • kernel-64k AlmaLinux 10 6.12.0-211.50.1.el10_2
  • kernel-core AlmaLinux 10 6.12.0-211.50.1.el10_2

almalinux advisories ALSA-2026:61887ALSA-2026:59723ALSA-2026:59737ALSA-2026:59821

  • kernel Rocky Linux 10 6.12.0-211.50.1.el10_2
  • kernel Rocky Linux 9 5.14.0-687.42.1.el9_8
  • kernel-rt Rocky Linux 8 4.18.0-553.158.1.rt7.499.el8_10
  • kernel Rocky Linux 8 4.18.0-553.158.1.el8_10

rocky linux advisories RLSA-2026:61887RLSA-2026:59723RLSA-2026:59737RLSA-2026:59821

  • kernel Azure Linux 3.0 6.6.145.2-1

azure linux advisories AZL-92868

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-2026-64189 updated cvss 4.7

kernel: netfilter: ipset: fix race between dump and ip_set_list resize

  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more
    affected: workaround, no fix planned “Out of support scope”
  • 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
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-687.42.1.el9_8, perf 5.14.0-687.42.1.el9_8, rtla 5.14.0-687.42.1.el9_8, python3-perf 5.14.0-687.42.1.el9_8, kernel-devel-matched 5.14.0-687.42.1.el9_8, kernel-64k-devel-matched 5.14.0-687.42.1.el9_8, +7 more
    fixed: vendor fix RHSA-2026:59723
  • Red Hat Enterprise Linux AppStream (v. 10) rv 6.12.0-211.50.1.el10_2, perf 6.12.0-211.50.1.el10_2, rtla 6.12.0-211.50.1.el10_2, python3-perf 6.12.0-211.50.1.el10_2, kernel-devel-matched 6.12.0-211.50.1.el10_2, kernel-64k-devel-matched 6.12.0-211.50.1.el10_2, +7 more
    fixed: vendor fix RHSA-2026:61887
  • Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-553.158.1.el8_10, kernel 4.18.0-553.158.1.el8_10, bpftool 4.18.0-553.158.1.el8_10, kernel-core 4.18.0-553.158.1.el8_10, kernel-tools 4.18.0-553.158.1.el8_10, python3-perf 4.18.0-553.158.1.el8_10, +15 more
    fixed: vendor fix RHSA-2026:59821
  • Red Hat Enterprise Linux BaseOS (v. 9) kernel 5.14.0-687.42.1.el9_8, kernel-64k 5.14.0-687.42.1.el9_8, kernel-core 5.14.0-687.42.1.el9_8, kernel-tools 5.14.0-687.42.1.el9_8, kernel-modules 5.14.0-687.42.1.el9_8, kernel-64k-core 5.14.0-687.42.1.el9_8, +27 more
    fixed: vendor fix RHSA-2026:59723
  • Red Hat Enterprise Linux BaseOS (v. 10) kernel 6.12.0-211.50.1.el10_2, kernel-64k 6.12.0-211.50.1.el10_2, kernel-core 6.12.0-211.50.1.el10_2, kernel-tools 6.12.0-211.50.1.el10_2, kernel-modules 6.12.0-211.50.1.el10_2, kernel-64k-core 6.12.0-211.50.1.el10_2, +28 more
    fixed: vendor fix RHSA-2026:61887
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libperf 5.14.0-687.42.1.el9_8, kernel-debuginfo-common-s390x 5.14.0-687.42.1.el9_8, kernel-debuginfo-common-x86_64 5.14.0-687.42.1.el9_8, kernel-debuginfo-common-aarch64 5.14.0-687.42.1.el9_8, kernel-debuginfo-common-ppc64le 5.14.0-687.42.1.el9_8
    fixed: vendor fix RHSA-2026:59723
show 9 more
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libperf 6.12.0-211.50.1.el10_2, kernel-debuginfo-common-s390x 6.12.0-211.50.1.el10_2, kernel-debuginfo-common-x86_64 6.12.0-211.50.1.el10_2, kernel-debuginfo-common-aarch64 6.12.0-211.50.1.el10_2, kernel-debuginfo-common-ppc64le 6.12.0-211.50.1.el10_2
    fixed: vendor fix RHSA-2026:61887
  • Red Hat Enterprise Linux CRB (v. 8) kernel-debuginfo-common-x86_64 4.18.0-553.158.1.el8_10, kernel-debuginfo-common-aarch64 4.18.0-553.158.1.el8_10, kernel-debuginfo-common-ppc64le 4.18.0-553.158.1.el8_10
    fixed: vendor fix RHSA-2026:59821
  • Red Hat Enterprise Linux NFV (v. 8) kernel-rt 4.18.0-553.158.1.rt7.499.el8_10, kernel-rt-kvm 4.18.0-553.158.1.rt7.499.el8_10, kernel-rt-core 4.18.0-553.158.1.rt7.499.el8_10, kernel-rt-modules 4.18.0-553.158.1.rt7.499.el8_10, kernel-rt-debug-kvm 4.18.0-553.158.1.rt7.499.el8_10, kernel-rt-debug-core 4.18.0-553.158.1.rt7.499.el8_10, +4 more
    fixed: vendor fix RHSA-2026:59737
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-687.42.1.el9_8, kernel-rt-64k 5.14.0-687.42.1.el9_8, kernel-rt-core 5.14.0-687.42.1.el9_8, kernel-rt-modules 5.14.0-687.42.1.el9_8, kernel-rt-64k-core 5.14.0-687.42.1.el9_8, kernel-rt-debug-core 5.14.0-687.42.1.el9_8, +14 more
    fixed: vendor fix RHSA-2026:59723
  • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt 6.12.0-211.50.1.el10_2, kernel-rt-64k 6.12.0-211.50.1.el10_2, kernel-rt-core 6.12.0-211.50.1.el10_2, kernel-rt-modules 6.12.0-211.50.1.el10_2, kernel-rt-64k-core 6.12.0-211.50.1.el10_2, kernel-rt-debug-core 6.12.0-211.50.1.el10_2, +14 more
    fixed: vendor fix RHSA-2026:61887
  • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-687.42.1.el9_8, kernel-rt-core 5.14.0-687.42.1.el9_8, kernel-rt-modules 5.14.0-687.42.1.el9_8, kernel-rt-debug-core 5.14.0-687.42.1.el9_8, kernel-rt-modules-core 5.14.0-687.42.1.el9_8, kernel-rt-debug-modules 5.14.0-687.42.1.el9_8, +4 more
    fixed: vendor fix RHSA-2026:59723
  • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt 6.12.0-211.50.1.el10_2, kernel-rt-core 6.12.0-211.50.1.el10_2, kernel-rt-modules 6.12.0-211.50.1.el10_2, kernel-rt-debug-core 6.12.0-211.50.1.el10_2, kernel-rt-modules-core 6.12.0-211.50.1.el10_2, kernel-rt-debug-modules 6.12.0-211.50.1.el10_2, +4 more
    fixed: vendor fix RHSA-2026:61887
  • Red Hat Enterprise Linux RT (v. 8) kernel-rt 4.18.0-553.158.1.rt7.499.el8_10, kernel-rt-core 4.18.0-553.158.1.rt7.499.el8_10, kernel-rt-modules 4.18.0-553.158.1.rt7.499.el8_10, kernel-rt-debug-core 4.18.0-553.158.1.rt7.499.el8_10, kernel-rt-debug-modules 4.18.0-553.158.1.rt7.499.el8_10, kernel-rt-modules-extra 4.18.0-553.158.1.rt7.499.el8_10, +2 more
    fixed: vendor fix RHSA-2026:59737
  • Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more
    not affected: vulnerable code not present

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
23 d ago

Exploit prediction

0.13% chance of exploitation in the next 30 days, higher than 2% 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

Affected products

  • Linux Linux

Classification

Weakness
  • CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization
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.