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Fencer Vulns
high 7.8

CVE-2023-3776 json

Use-after-free in Linux kernel's net/sched: cls_fw component

published 2023-07-21 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-44409

cvss
7.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 43%
public exploits
0
none known

Summary

A use-after-free vulnerability in the Linux kernel's net/sched: cls_fw component can be exploited to achieve local privilege escalation.

If tcf_change_indev() fails, fw_set_parms() will immediately return an error after incrementing or decrementing the reference counter in tcf_bind_filter(). If an attacker can control the reference counter and set it to zero, they can cause the reference to be freed, leading to a use-after-free vulnerability.

We recommend upgrading past commit 0323bce598eea038714f941ce2b22541c46d488f.

Patch / fix

  • Linux Kernel 6.5
  • linux Debian 12 6.1.52-1
  • linux Debian 14, Debian 13 6.4.4-2

debian advisories DEBIAN-CVE-2023-3776

  • linux Ubuntu 20.04 LTS 5.4.0-159.176
  • linux Ubuntu 22.04 LTS 5.15.0-82.91
  • linux-aws Ubuntu 20.04 LTS 5.4.0-1108.116
  • linux-aws Ubuntu 22.04 LTS 5.15.0-1043.48
  • linux-gcp Ubuntu 20.04 LTS 5.4.0-1111.120
  • linux-gcp Ubuntu 22.04 LTS 5.15.0-1040.48
  • linux-gke Ubuntu 22.04 LTS 5.15.0-1040.45
  • linux-ibm Ubuntu 20.04 LTS 5.4.0-1056.61

ubuntu advisories UBUNTU-CVE-2023-3776

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

  • kpatch-patch-5_14_0-284_11_1 RHEL 9 1-5.el9_2
  • kpatch-patch-5_14_0-284_18_1 RHEL 9 1-4.el9_2
  • kpatch-patch-5_14_0-284_25_1 RHEL 9 1-3.el9_2
  • kernel RHEL 9 5.14.0-284.30.1.el9_2
  • perf RHEL 9 5.14.0-284.30.1.el9_2
  • rtla RHEL 9 5.14.0-284.30.1.el9_2
  • bpftool RHEL 9 7.0.0-284.30.1.el9_2
  • kernel-64k RHEL 9 5.14.0-284.30.1.el9_2

red hat advisories RHSA-2023:7411RHSA-2023:7382RHSA-2023:7389RHSA-2023:5093RHSA-2023:5069RHSA-2023:5091

  • kernel-syms SLES for SAP 12 SP5, SLES 12 SP5 4.12.14-122.173.1
  • kernel-source SLES for SAP 12 SP5, SLES 12 SP5 4.12.14-122.173.1
  • kernel-default SLES for SAP 12 SP5, SLES 12 SP5, SLE Workstation Extension 12 SP5 +2 more 4.12.14-122.173.1
  • kernel-obs-build SLE Software Development Kit 12 SP5 4.12.14-122.173.1
  • kernel-rt SLE Micro 5.2, SLE Micro 5.1 5.3.18-150300.138.3
  • kernel-default SLES for SAP 15 SP1, SLES 15 SP1-LTSS, SLE Live Patching 15 SP1 +3 more 4.12.14-150100.197.154.1
  • kernel-vanilla openSUSE Leap 15.5, openSUSE Leap 15.4 4.12.14-150100.197.154.1
  • kernel-kvmsmall openSUSE Leap 15.4 4.12.14-150100.197.154.1

suse advisories SUSE-SU-2023:3924-1SUSE-SU-2023:3923-1SUSE-SU-2023:3928-1SUSE-SU-2023:3922-1SUSE-SU-2023:3893-1SUSE-SU-2023:3892-1

  • kernel AlmaLinux 8 4.18.0-477.27.2.el8_8
  • perf AlmaLinux 8 4.18.0-477.27.2.el8_8
  • bpftool AlmaLinux 8 4.18.0-477.27.2.el8_8
  • kernel-core AlmaLinux 8 4.18.0-477.27.2.el8_8
  • kernel-tools AlmaLinux 8 4.18.0-477.27.2.el8_8
  • python3-perf AlmaLinux 8 4.18.0-477.27.2.el8_8
  • kernel-modules AlmaLinux 8 4.18.0-477.27.2.el8_8
  • kernel-zfcpdump AlmaLinux 8 4.18.0-477.27.2.el8_8

almalinux advisories ALSA-2023:5244ALSA-2023:5069ALSA-2023:5091

  • kernel Rocky Linux 8 4.18.0-477.27.1.el8_8.cloud
  • kernel Rocky Linux 8 4.18.0-477.27.1.el8_8
  • kernel-rt Rocky Linux 9 5.14.0-284.30.1.rt14.315.el9_2

rocky linux advisories RXSA-2023:5244RLSA-2023:5244RLSA-2023:5091

  • kernel CBL-Mariner 2.0 5.15.122.1-2

azure linux advisories AZL-27677

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-2023-3776 updated cvss 7.0

kernel: net/sched: cls_fw component can be exploited as result of failure in tcf_change_indev function

  • Red Hat CodeReady Linux Builder EUS (v.8.6) kernel-debuginfo-common-x86_64 4.18.0-372.80.1.el8_6, kernel-debuginfo-common-aarch64 4.18.0-372.80.1.el8_6, kernel-debuginfo-common-ppc64le 4.18.0-372.80.1.el8_6
    fixed: vendor fix “To mitigate this issue, prevent module cls_fw 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-2023:7398
  • Red Hat CodeReady Linux Builder EUS (v.9.0) kernel-debuginfo-common-s390x 5.14.0-70.80.1.el9_0, kernel-debuginfo-common-x86_64 5.14.0-70.80.1.el9_0, kernel-debuginfo-common-aarch64 5.14.0-70.80.1.el9_0, kernel-debuginfo-common-ppc64le 5.14.0-70.80.1.el9_0
    fixed: vendor fix “To mitigate this issue, prevent module cls_fw 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-2023:7382
  • Red Hat Enterprise Linux AppStream (v. 9) perf 5.14.0-284.30.1.el9_2, rtla 5.14.0-284.30.1.el9_2, kernel-devel-matched 5.14.0-284.30.1.el9_2, kernel-64k-devel-matched 5.14.0-284.30.1.el9_2, kernel-debug-devel-matched 5.14.0-284.30.1.el9_2, kernel-debuginfo-common-s390x 5.14.0-284.30.1.el9_2, +5 more
    fixed: vendor fix “To mitigate this issue, prevent module cls_fw 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-2023:5069
  • Red Hat Enterprise Linux AppStream EUS (v.9.0) perf 5.14.0-70.80.1.el9_0, kernel-devel-matched 5.14.0-70.80.1.el9_0, kernel-debug-devel-matched 5.14.0-70.80.1.el9_0, kernel-debuginfo-common-s390x 5.14.0-70.80.1.el9_0, kernel-zfcpdump-devel-matched 5.14.0-70.80.1.el9_0, kernel-debuginfo-common-x86_64 5.14.0-70.80.1.el9_0, +2 more
    fixed: vendor fix “To mitigate this issue, prevent module cls_fw 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-2023:7382
  • Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-477.27.1.el8_8, kernel 4.18.0-477.27.1.el8_8, bpftool 4.18.0-477.27.1.el8_8, kernel-core 4.18.0-477.27.1.el8_8, kernel-tools 4.18.0-477.27.1.el8_8, python3-perf 4.18.0-477.27.1.el8_8, +19 more
    fixed: vendor fix “To mitigate this issue, prevent module cls_fw 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-2023:5244
  • Red Hat Enterprise Linux BaseOS (v. 9) bpftool 7.0.0-284.30.1.el9_2, kernel 5.14.0-284.30.1.el9_2, kernel-64k 5.14.0-284.30.1.el9_2, kernel-core 5.14.0-284.30.1.el9_2, kernel-tools 5.14.0-284.30.1.el9_2, python3-perf 5.14.0-284.30.1.el9_2, +31 more
    fixed: vendor fix “To mitigate this issue, prevent module cls_fw 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-2023:5069
  • Red Hat Enterprise Linux BaseOS AUS (v. 8.2) perf 4.18.0-193.119.1.el8_2, kernel 4.18.0-193.119.1.el8_2, bpftool 4.18.0-193.119.1.el8_2, kernel-core 4.18.0-193.119.1.el8_2, kernel-tools 4.18.0-193.119.1.el8_2, python3-perf 4.18.0-193.119.1.el8_2, +8 more
    fixed: vendor fix “To mitigate this issue, prevent module cls_fw 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-2023:7434
  • Red Hat Enterprise Linux BaseOS AUS (v.8.4) perf 4.18.0-305.108.1.el8_4, kernel 4.18.0-305.108.1.el8_4, bpftool 4.18.0-305.108.1.el8_4, kernel-core 4.18.0-305.108.1.el8_4, kernel-tools 4.18.0-305.108.1.el8_4, python3-perf 4.18.0-305.108.1.el8_4, +8 more
    fixed: vendor fix “To mitigate this issue, prevent module cls_fw 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-2023:5628
show 27 more
  • Red Hat Enterprise Linux BaseOS E4S (v. 8.1) perf 4.18.0-147.94.1.el8_1, kernel 4.18.0-147.94.1.el8_1, bpftool 4.18.0-147.94.1.el8_1, kernel-core 4.18.0-147.94.1.el8_1, kernel-tools 4.18.0-147.94.1.el8_1, python3-perf 4.18.0-147.94.1.el8_1, +13 more
    fixed: vendor fix “To mitigate this issue, prevent module cls_fw 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-2023:6813
  • Red Hat Enterprise Linux BaseOS E4S (v. 8.2) perf 4.18.0-193.119.1.el8_2, kernel 4.18.0-193.119.1.el8_2, bpftool 4.18.0-193.119.1.el8_2, kernel-core 4.18.0-193.119.1.el8_2, kernel-tools 4.18.0-193.119.1.el8_2, python3-perf 4.18.0-193.119.1.el8_2, +12 more
    fixed: vendor fix “To mitigate this issue, prevent module cls_fw 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-2023:7434
  • Red Hat Enterprise Linux BaseOS E4S (v.8.4) perf 4.18.0-305.108.1.el8_4, kernel 4.18.0-305.108.1.el8_4, bpftool 4.18.0-305.108.1.el8_4, kernel-core 4.18.0-305.108.1.el8_4, kernel-tools 4.18.0-305.108.1.el8_4, python3-perf 4.18.0-305.108.1.el8_4, +21 more
    fixed: vendor fix “To mitigate this issue, prevent module cls_fw 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-2023:5628
  • Red Hat Enterprise Linux BaseOS EUS (v.8.6) perf 4.18.0-372.80.1.el8_6, kernel 4.18.0-372.80.1.el8_6, bpftool 4.18.0-372.80.1.el8_6, kernel-core 4.18.0-372.80.1.el8_6, kernel-tools 4.18.0-372.80.1.el8_6, python3-perf 4.18.0-372.80.1.el8_6, +20 more
    fixed: vendor fix “To mitigate this issue, prevent module cls_fw 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-2023:7398
  • Red Hat Enterprise Linux BaseOS EUS (v.9.0) kernel 5.14.0-70.80.1.el9_0, bpftool 5.14.0-70.80.1.el9_0, kernel-core 5.14.0-70.80.1.el9_0, kernel-tools 5.14.0-70.80.1.el9_0, python3-perf 5.14.0-70.80.1.el9_0, kernel-modules 5.14.0-70.80.1.el9_0, +19 more
    fixed: vendor fix “To mitigate this issue, prevent module cls_fw 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-2023:7382
  • Red Hat Enterprise Linux BaseOS TUS (v. 8.2) perf 4.18.0-193.119.1.el8_2, kernel 4.18.0-193.119.1.el8_2, bpftool 4.18.0-193.119.1.el8_2, kernel-core 4.18.0-193.119.1.el8_2, kernel-tools 4.18.0-193.119.1.el8_2, python3-perf 4.18.0-193.119.1.el8_2, +8 more
    fixed: vendor fix “To mitigate this issue, prevent module cls_fw 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-2023:7434
  • Red Hat Enterprise Linux BaseOS TUS (v.8.4) perf 4.18.0-305.108.1.el8_4, kernel 4.18.0-305.108.1.el8_4, bpftool 4.18.0-305.108.1.el8_4, kernel-core 4.18.0-305.108.1.el8_4, kernel-tools 4.18.0-305.108.1.el8_4, python3-perf 4.18.0-305.108.1.el8_4, +8 more
    fixed: vendor fix “To mitigate this issue, prevent module cls_fw 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-2023:5628
  • Red Hat Enterprise Linux Client (v. 7) perf 3.10.0-1160.105.1.el7, kernel 3.10.0-1160.105.1.el7, bpftool 3.10.0-1160.105.1.el7, python-perf 3.10.0-1160.105.1.el7, kernel-tools 3.10.0-1160.105.1.el7, kernel-tools-libs 3.10.0-1160.105.1.el7, +2 more Red Hat Enterprise Linux Client Optional (v. 7) kernel-debuginfo-common-x86_64 3.10.0-1160.105.1.el7 Red Hat Enterprise Linux ComputeNode Optional (v. 7) kernel-debuginfo-common-x86_64 3.10.0-1160.105.1.el7
    fixed: vendor fix “To mitigate this issue, prevent module cls_fw 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-2023:7423
  • Red Hat Enterprise Linux CRB (v. 8) kernel-debuginfo-common-x86_64 4.18.0-477.27.1.el8_8, kernel-debuginfo-common-aarch64 4.18.0-477.27.1.el8_8, kernel-debuginfo-common-ppc64le 4.18.0-477.27.1.el8_8
    fixed: vendor fix “To mitigate this issue, prevent module cls_fw 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-2023:5244
  • Red Hat Enterprise Linux CRB (v. 9) kernel-debuginfo-common-s390x 5.14.0-284.30.1.el9_2, kernel-debuginfo-common-x86_64 5.14.0-284.30.1.el9_2, kernel-debuginfo-common-aarch64 5.14.0-284.30.1.el9_2, kernel-debuginfo-common-ppc64le 5.14.0-284.30.1.el9_2
    fixed: vendor fix “To mitigate this issue, prevent module cls_fw 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-2023:5069
  • Red Hat Enterprise Linux for Real Time (v. 7) kernel-rt 3.10.0-1160.105.1.rt56.1256.el7, kernel-rt-trace 3.10.0-1160.105.1.rt56.1256.el7, kernel-rt-debuginfo-common-x86_64 3.10.0-1160.105.1.rt56.1256.el7 Red Hat Enterprise Linux for Real Time for NFV (v. 7) kernel-rt 3.10.0-1160.105.1.rt56.1256.el7, kernel-rt-kvm 3.10.0-1160.105.1.rt56.1256.el7, kernel-rt-trace 3.10.0-1160.105.1.rt56.1256.el7, kernel-rt-debug-kvm 3.10.0-1160.105.1.rt56.1256.el7, kernel-rt-trace-kvm 3.10.0-1160.105.1.rt56.1256.el7, kernel-rt-debuginfo-common-x86_64 3.10.0-1160.105.1.rt56.1256.el7
    fixed: vendor fix “To mitigate this issue, prevent module cls_fw 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-2023:7424
  • Red Hat Enterprise Linux NFV (v. 8) kernel-rt 4.18.0-477.27.1.rt7.290.el8_8, kernel-rt-kvm 4.18.0-477.27.1.rt7.290.el8_8, kernel-rt-core 4.18.0-477.27.1.rt7.290.el8_8, kernel-rt-modules 4.18.0-477.27.1.rt7.290.el8_8, kernel-rt-debug-kvm 4.18.0-477.27.1.rt7.290.el8_8, kernel-rt-debug-core 4.18.0-477.27.1.rt7.290.el8_8, +4 more
    fixed: vendor fix “To mitigate this issue, prevent module cls_fw 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-2023:5255
  • Red Hat Enterprise Linux NFV (v. 9) kernel-rt 5.14.0-284.30.1.rt14.315.el9_2, kernel-rt-kvm 5.14.0-284.30.1.rt14.315.el9_2, kernel-rt-core 5.14.0-284.30.1.rt14.315.el9_2, kernel-rt-modules 5.14.0-284.30.1.rt14.315.el9_2, kernel-rt-debug-kvm 5.14.0-284.30.1.rt14.315.el9_2, kernel-rt-debug-core 5.14.0-284.30.1.rt14.315.el9_2, +6 more
    fixed: vendor fix “To mitigate this issue, prevent module cls_fw 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-2023:5091
  • Red Hat Enterprise Linux NFV TUS (v.8.4) kernel-rt 4.18.0-305.108.1.rt7.183.el8_4, kernel-rt-kvm 4.18.0-305.108.1.rt7.183.el8_4, kernel-rt-core 4.18.0-305.108.1.rt7.183.el8_4, kernel-rt-modules 4.18.0-305.108.1.rt7.183.el8_4, kernel-rt-debug-kvm 4.18.0-305.108.1.rt7.183.el8_4, kernel-rt-debug-core 4.18.0-305.108.1.rt7.183.el8_4, +4 more
    fixed: vendor fix “To mitigate this issue, prevent module cls_fw 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-2023:5794
  • Red Hat Enterprise Linux Real Time EUS (v.9.0) kernel-rt 5.14.0-70.80.1.rt21.151.el9_0, kernel-rt-core 5.14.0-70.80.1.rt21.151.el9_0, kernel-rt-modules 5.14.0-70.80.1.rt21.151.el9_0, kernel-rt-debug-core 5.14.0-70.80.1.rt21.151.el9_0, kernel-rt-debug-modules 5.14.0-70.80.1.rt21.151.el9_0, kernel-rt-modules-extra 5.14.0-70.80.1.rt21.151.el9_0, +2 more Red Hat Enterprise Linux Real Time for NFV EUS (v.9.0) kernel-rt 5.14.0-70.80.1.rt21.151.el9_0, kernel-rt-kvm 5.14.0-70.80.1.rt21.151.el9_0, kernel-rt-core 5.14.0-70.80.1.rt21.151.el9_0, kernel-rt-modules 5.14.0-70.80.1.rt21.151.el9_0, kernel-rt-debug-kvm 5.14.0-70.80.1.rt21.151.el9_0, kernel-rt-debug-core 5.14.0-70.80.1.rt21.151.el9_0, +4 more
    fixed: vendor fix “To mitigate this issue, prevent module cls_fw 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-2023:7389
  • Red Hat Enterprise Linux Real Time for NFV TUS (v. 8.2) kernel-rt 4.18.0-193.119.1.rt13.170.el8_2, kernel-rt-kvm 4.18.0-193.119.1.rt13.170.el8_2, kernel-rt-core 4.18.0-193.119.1.rt13.170.el8_2, kernel-rt-modules 4.18.0-193.119.1.rt13.170.el8_2, kernel-rt-debug-kvm 4.18.0-193.119.1.rt13.170.el8_2, kernel-rt-debug-core 4.18.0-193.119.1.rt13.170.el8_2, +4 more Red Hat Enterprise Linux Real Time TUS (v. 8.2) kernel-rt 4.18.0-193.119.1.rt13.170.el8_2, kernel-rt-core 4.18.0-193.119.1.rt13.170.el8_2, kernel-rt-modules 4.18.0-193.119.1.rt13.170.el8_2, kernel-rt-debug-core 4.18.0-193.119.1.rt13.170.el8_2, kernel-rt-debug-modules 4.18.0-193.119.1.rt13.170.el8_2, kernel-rt-modules-extra 4.18.0-193.119.1.rt13.170.el8_2, +2 more
    fixed: vendor fix “To mitigate this issue, prevent module cls_fw 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-2023:7431
  • Red Hat Enterprise Linux RT (v. 8) kernel-rt 4.18.0-477.27.1.rt7.290.el8_8, kernel-rt-core 4.18.0-477.27.1.rt7.290.el8_8, kernel-rt-modules 4.18.0-477.27.1.rt7.290.el8_8, kernel-rt-debug-core 4.18.0-477.27.1.rt7.290.el8_8, kernel-rt-debug-modules 4.18.0-477.27.1.rt7.290.el8_8, kernel-rt-modules-extra 4.18.0-477.27.1.rt7.290.el8_8, +2 more
    fixed: vendor fix “To mitigate this issue, prevent module cls_fw 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-2023:5255
  • Red Hat Enterprise Linux RT (v. 9) kernel-rt 5.14.0-284.30.1.rt14.315.el9_2, kernel-rt-core 5.14.0-284.30.1.rt14.315.el9_2, kernel-rt-modules 5.14.0-284.30.1.rt14.315.el9_2, kernel-rt-debug-core 5.14.0-284.30.1.rt14.315.el9_2, kernel-rt-modules-core 5.14.0-284.30.1.rt14.315.el9_2, kernel-rt-debug-modules 5.14.0-284.30.1.rt14.315.el9_2, +4 more
    fixed: vendor fix “To mitigate this issue, prevent module cls_fw 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-2023:5091
  • Red Hat Enterprise Linux RT TUS (v.8.4) kernel-rt 4.18.0-305.108.1.rt7.183.el8_4, kernel-rt-core 4.18.0-305.108.1.rt7.183.el8_4, kernel-rt-modules 4.18.0-305.108.1.rt7.183.el8_4, kernel-rt-debug-core 4.18.0-305.108.1.rt7.183.el8_4, kernel-rt-debug-modules 4.18.0-305.108.1.rt7.183.el8_4, kernel-rt-modules-extra 4.18.0-305.108.1.rt7.183.el8_4, +2 more
    fixed: vendor fix “To mitigate this issue, prevent module cls_fw 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-2023:5794
  • Red Hat Enterprise Linux Server (v. 6 ELS) perf 2.6.32-754.53.1.el6, kernel 2.6.32-754.53.1.el6, kernel-kdump 2.6.32-754.53.1.el6, kernel-firmware 2.6.32-754.53.1.el6, kernel-abi-whitelists 2.6.32-754.53.1.el6, kernel-debuginfo-common-i686 2.6.32-754.53.1.el6, +2 more
    fixed: vendor fix “To mitigate this issue, prevent module cls_fw 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-2024:1831
  • Red Hat Enterprise Linux Server (v. 7) perf 3.10.0-1160.105.1.el7, kernel 3.10.0-1160.105.1.el7, bpftool 3.10.0-1160.105.1.el7, python-perf 3.10.0-1160.105.1.el7, kernel-kdump 3.10.0-1160.105.1.el7, kernel-tools 3.10.0-1160.105.1.el7, +12 more
    fixed: vendor fix “To mitigate this issue, prevent module cls_fw 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-2023:7423
  • Red Hat Enterprise Linux Server AUS (v. 7.6) perf 3.10.0-957.108.1.el7, kernel 3.10.0-957.108.1.el7, bpftool 3.10.0-957.108.1.el7, python-perf 3.10.0-957.108.1.el7, kernel-tools 3.10.0-957.108.1.el7, kernel-tools-libs 3.10.0-957.108.1.el7, +2 more
    fixed: vendor fix “To mitigate this issue, prevent module cls_fw 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-2023:7294
  • Red Hat Enterprise Linux Server AUS (v. 7.7) perf 3.10.0-1062.82.1.el7, kernel 3.10.0-1062.82.1.el7, bpftool 3.10.0-1062.82.1.el7, python-perf 3.10.0-1062.82.1.el7, kernel-tools 3.10.0-1062.82.1.el7, kernel-tools-libs 3.10.0-1062.82.1.el7, +2 more
    fixed: vendor fix “To mitigate this issue, prevent module cls_fw 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-2024:0262
  • Red Hat Enterprise Linux Server Optional (v. 6 ELS) python-perf 2.6.32-754.53.1.el6, kernel-debuginfo-common-i686 2.6.32-754.53.1.el6, kernel-debuginfo-common-s390x 2.6.32-754.53.1.el6, kernel-debuginfo-common-x86_64 2.6.32-754.53.1.el6
    fixed: vendor fix “To mitigate this issue, prevent module cls_fw 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-2024:1831
  • Red Hat Enterprise Linux Server Optional (v. 7) kernel-debuginfo-common-ppc64 3.10.0-1160.105.1.el7, kernel-debuginfo-common-x86_64 3.10.0-1160.105.1.el7, kernel-debuginfo-common-ppc64le 3.10.0-1160.105.1.el7
    fixed: vendor fix “To mitigate this issue, prevent module cls_fw 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-2023:7423
  • Red Hat Enterprise Linux Server Optional AUS (v. 7.6) kernel-debuginfo-common-x86_64 3.10.0-957.108.1.el7
    fixed: vendor fix “To mitigate this issue, prevent module cls_fw 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-2023:7294
  • Red Hat Enterprise Linux Server Optional AUS (v. 7.7) kernel-debuginfo-common-x86_64 3.10.0-1062.82.1.el7
    fixed: vendor fix “To mitigate this issue, prevent module cls_fw 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-2024:0262

3 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 ICSA-23-166-10 updated cvss 7.8

Siemens SIMATIC S7-1500 TM MFP BIOS

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

cisa ICSA-24-046-11 updated cvss 7.8

Siemens SCALANCE XCM-/XRM-300

  • Siemens SCALANCE XCH328 (6GK5328-4TS01-2EC2) <V2.4 Siemens SCALANCE XCM324 (6GK5324-8TS01-2AC2) <V2.4 Siemens SCALANCE XCM328 (6GK5328-4TS01-2AC2) <V2.4 Siemens SCALANCE XCM332 (6GK5332-0GA01-2AC2) <V2.4 Siemens SCALANCE XRH334 (24 V DC, 8xFO, CC) (6GK5334-2TS01-2ER3) <V2.4 Siemens SCALANCE XRM334 (2x230 V AC, 8xFO) (6GK5334-2TS01-4AR3) <V2.4
    +5 more products
    Siemens SCALANCE XRM334 (2x230 V AC, 12xFO) (6GK5334-3TS01-4AR3) <V2.4 Siemens SCALANCE XRM334 (24 V DC, 8xFO) (6GK5334-2TS01-2AR3) <V2.4 Siemens SCALANCE XRM334 (24 V DC, 12xFO) (6GK5334-3TS01-2AR3) <V2.4 Siemens SCALANCE XRM334 (230 V AC, 8xFO) (6GK5334-2TS01-3AR3) <V2.4 Siemens SCALANCE XRM334 (230 V AC, 12xFO) (6GK5334-3TS01-3AR3) <V2.4
    affected: fixed in V2.4 support.industry.siemens.com

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
20 mo ago

Exploit prediction

0.51% chance of exploitation in the next 30 days, higher than 43% 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 Kernel

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.