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Fencer Vulns
high 7.8

CVE-2025-37890 json

net_sched: hfsc: Fix a UAF vulnerability in class with netem as child qdisc

published 2025-05-16 17 mo ago modified 2026-08-05 3 mo ago also EUVD-2025-15440

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 12%
public exploits
0
none known

Summary

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

net_sched: hfsc: Fix a UAF vulnerability in class with netem as child qdisc

As described in Gerrard's report [1], we have a UAF case when an hfsc class has a netem child qdisc. The crux of the issue is that hfsc is assuming that checking for cl->qdisc->q.qlen == 0 guarantees that it hasn't inserted the class in the vttree or eltree (which is not true for the netem duplicate case).

This patch checks the n_active class variable to make sure that the code won't insert the class in the vttree or eltree twice, catering for the reentrant case.

[1] https://lore.kernel.org/netdev/CAHcdcOm+03OD2j6R0=YHKqmy=VgJ8xEOKuP6c7mSgnp-TEJJbw@mail.gmail.com/

Patch / fix

  • Linux Linux 5.4.294, 5.10.238, 5.15.182, 6.1.138, 6.6.90, 6.12.28, 6.14.6, 6.15
  • linux Debian 12 6.1.140-1
  • linux Debian 14, Debian 13 6.12.29-1

debian advisories DEBIAN-CVE-2025-37890

  • linux Ubuntu 22.04 LTS 5.15.0-143.153
  • linux Ubuntu 24.04 LTS 6.8.0-63.66
  • linux-aws Ubuntu 22.04 LTS 5.15.0-1087.94
  • linux-aws Ubuntu 24.04 LTS 6.8.0-1031.33
  • linux-gcp Ubuntu 22.04 LTS 5.15.0-1086.95
  • linux-gcp Ubuntu 24.04 LTS 6.8.0-1032.34
  • linux-gke Ubuntu 22.04 LTS 5.15.0-1084.90
  • linux-gke Ubuntu 24.04 LTS 6.8.0-1027.31

ubuntu advisories UBUNTU-CVE-2025-37890

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-4_18_0-553_72_1 RHEL 8 1-2.el8_10
  • kpatch-patch-4_18_0-553_16_1 RHEL 8 1-10.el8_10
  • kpatch-patch-4_18_0-553_30_1 RHEL 8 1-9.el8_10
  • kpatch-patch-4_18_0-553_40_1 RHEL 8 1-7.el8_10
  • kpatch-patch-4_18_0-553_53_1 RHEL 8 1-5.el8_10
  • kpatch-patch-5_14_0-570_17_1 RHEL 9 1-10.el9_6
  • kernel-rt RHEL 8 4.18.0-553.66.1.rt7.407.el8_10
  • kernel-rt-kvm RHEL 8 4.18.0-553.66.1.rt7.407.el8_10

red hat advisories RHSA-2025:16582RHSA-2025:16583RHSA-2025:16580RHSA-2025:16540RHSA-2025:16541RHSA-2025:16538

  • kernel-livepatch-MICRO-6-0-RT_Update_2 Linux Micro 6.1, Linux Micro 6.0 11-1.1
  • kernel-livepatch-MICRO-6-0_Update_2 Linux Micro 6.1, Linux Micro 6.0 11-1.1
  • kernel-livepatch-MICRO-6-0_Update_5 Linux Micro 6.1, Linux Micro 6.0 7-1.2
  • kernel-livepatch-MICRO-6-0-RT_Update_3 Linux Micro 6.0 11-1.2
  • kernel-livepatch-MICRO-6-0-RT_Update_4 Linux Micro 6.0 8-1.1
  • kernel-livepatch-MICRO-6-0-RT_Update_5 Linux Micro 6.0 7-1.1
  • kernel-livepatch-SLE15-SP6_Update_9 SLE Live Patching 15 SP6 6-150600.2.1
  • kernel-livepatch-SLE15-SP6_Update_5 SLE Live Patching 15 SP6 15-150600.2.1

suse advisories SUSE-SU-2025:03235-1SUSE-SU-2025:03226-1SUSE-SU-2025:03223-1SUSE-SU-2025:03217-1SUSE-SU-2025:03215-1SUSE-SU-2025:03212-1

  • kernel-abi-stablelists AlmaLinux 10 6.12.0-55.25.1.el10_0
  • kernel AlmaLinux 9 5.14.0-570.32.1.el9_6
  • rv AlmaLinux 9 5.14.0-570.32.1.el9_6
  • perf AlmaLinux 9 5.14.0-570.32.1.el9_6
  • rtla AlmaLinux 9 5.14.0-570.32.1.el9_6
  • libperf AlmaLinux 9 5.14.0-570.32.1.el9_6
  • kernel-rt AlmaLinux 9 5.14.0-570.32.1.el9_6
  • kernel-64k AlmaLinux 9 5.14.0-570.32.1.el9_6

almalinux advisories ALSA-2025:12662ALSA-2025:12746ALSA-2025:12752ALSA-2025:12753

  • kernel Rocky Linux 9 5.14.0-570.32.1.el9_6
  • kernel Rocky Linux 10 6.12.0-55.25.1.el10_0
  • kernel-rt Rocky Linux 8 4.18.0-553.66.1.rt7.407.el8_10
  • kernel Rocky Linux 8 4.18.0-553.66.1.el8_10

rocky linux advisories RLSA-2025:12746RLSA-2025:12662RLSA-2025:12753RLSA-2025:12752

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-2025-37890 updated cvss 7.0

kernel: net_sched: hfsc: Fix a UAF vulnerability in class with netem as child qdisc

  • 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 sch_hfsc 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 5.14.0-427.81.1.el9_4, kernel-debuginfo-common-s390x 5.14.0-427.81.1.el9_4, kernel-debuginfo-common-x86_64 5.14.0-427.81.1.el9_4, kernel-debuginfo-common-aarch64 5.14.0-427.81.1.el9_4, kernel-debuginfo-common-ppc64le 5.14.0-427.81.1.el9_4
    fixed: vendor fix “To mitigate this issue, prevent module sch_hfsc 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-2025:13135
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-570.32.1.el9_6, perf 5.14.0-570.32.1.el9_6, rtla 5.14.0-570.32.1.el9_6, python3-perf 5.14.0-570.32.1.el9_6, kernel-devel-matched 5.14.0-570.32.1.el9_6, kernel-64k-devel-matched 5.14.0-570.32.1.el9_6, +7 more
    fixed: vendor fix “To mitigate this issue, prevent module sch_hfsc 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-2025:12746
  • Red Hat Enterprise Linux AppStream (v. 10) rv 6.12.0-55.25.1.el10_0, perf 6.12.0-55.25.1.el10_0, rtla 6.12.0-55.25.1.el10_0, python3-perf 6.12.0-55.25.1.el10_0, kernel-devel-matched 6.12.0-55.25.1.el10_0, kernel-64k-devel-matched 6.12.0-55.25.1.el10_0, +7 more
    fixed: vendor fix “To mitigate this issue, prevent module sch_hfsc 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-2025:12662
  • Red Hat Enterprise Linux AppStream E4S (v.9.0) perf 5.14.0-70.144.1.el9_0, kernel-devel-matched 5.14.0-70.144.1.el9_0, kernel-debug-devel-matched 5.14.0-70.144.1.el9_0, kernel-debuginfo-common-s390x 5.14.0-70.144.1.el9_0, kernel-zfcpdump-devel-matched 5.14.0-70.144.1.el9_0, kernel-debuginfo-common-x86_64 5.14.0-70.144.1.el9_0, +2 more
    fixed: vendor fix “To mitigate this issue, prevent module sch_hfsc 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-2025:14744
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) perf 5.14.0-284.128.1.el9_2, rtla 5.14.0-284.128.1.el9_2, kernel-devel-matched 5.14.0-284.128.1.el9_2, kernel-64k-devel-matched 5.14.0-284.128.1.el9_2, kernel-debug-devel-matched 5.14.0-284.128.1.el9_2, kernel-debuginfo-common-s390x 5.14.0-284.128.1.el9_2, +5 more
    fixed: vendor fix “To mitigate this issue, prevent module sch_hfsc 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-2025:12209
  • Red Hat Enterprise Linux AppStream EUS (v.9.4) rv 5.14.0-427.81.1.el9_4, perf 5.14.0-427.81.1.el9_4, rtla 5.14.0-427.81.1.el9_4, kernel-devel-matched 5.14.0-427.81.1.el9_4, kernel-64k-devel-matched 5.14.0-427.81.1.el9_4, kernel-debug-devel-matched 5.14.0-427.81.1.el9_4, +6 more
    fixed: vendor fix “To mitigate this issue, prevent module sch_hfsc 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-2025:13135
  • Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-553.66.1.el8_10, kernel 4.18.0-553.66.1.el8_10, bpftool 4.18.0-553.66.1.el8_10, kernel-core 4.18.0-553.66.1.el8_10, kernel-tools 4.18.0-553.66.1.el8_10, python3-perf 4.18.0-553.66.1.el8_10, +20 more
    fixed: vendor fix “To mitigate this issue, prevent module sch_hfsc 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-2025:12752
show 26 more
  • Red Hat Enterprise Linux BaseOS (v. 9) kernel 5.14.0-570.32.1.el9_6, kernel-64k 5.14.0-570.32.1.el9_6, kernel-core 5.14.0-570.32.1.el9_6, kernel-tools 5.14.0-570.32.1.el9_6, kernel-modules 5.14.0-570.32.1.el9_6, kernel-64k-core 5.14.0-570.32.1.el9_6, +28 more
    fixed: vendor fix “To mitigate this issue, prevent module sch_hfsc 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-2025:12746
  • Red Hat Enterprise Linux BaseOS (v. 10) kernel 6.12.0-55.25.1.el10_0, kernel-64k 6.12.0-55.25.1.el10_0, kernel-core 6.12.0-55.25.1.el10_0, kernel-tools 6.12.0-55.25.1.el10_0, kernel-modules 6.12.0-55.25.1.el10_0, kernel-64k-core 6.12.0-55.25.1.el10_0, +27 more
    fixed: vendor fix “To mitigate this issue, prevent module sch_hfsc 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-2025:12662
  • Red Hat Enterprise Linux BaseOS AUS (v. 8.2) perf 4.18.0-193.165.1.el8_2, kernel 4.18.0-193.165.1.el8_2, bpftool 4.18.0-193.165.1.el8_2, kernel-core 4.18.0-193.165.1.el8_2, kernel-tools 4.18.0-193.165.1.el8_2, python3-perf 4.18.0-193.165.1.el8_2, +8 more
    fixed: vendor fix “To mitigate this issue, prevent module sch_hfsc 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-2025:14742
  • Red Hat Enterprise Linux BaseOS AUS (v.8.4) perf 4.18.0-305.170.1.el8_4, kernel 4.18.0-305.170.1.el8_4, bpftool 4.18.0-305.170.1.el8_4, kernel-core 4.18.0-305.170.1.el8_4, kernel-tools 4.18.0-305.170.1.el8_4, python3-perf 4.18.0-305.170.1.el8_4, +8 more
    fixed: vendor fix “To mitigate this issue, prevent module sch_hfsc 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-2025:15035
  • Red Hat Enterprise Linux BaseOS AUS (v.8.6) perf 4.18.0-372.158.1.el8_6, kernel 4.18.0-372.158.1.el8_6, bpftool 4.18.0-372.158.1.el8_6, kernel-core 4.18.0-372.158.1.el8_6, kernel-tools 4.18.0-372.158.1.el8_6, python3-perf 4.18.0-372.158.1.el8_6, +8 more Red Hat Enterprise Linux BaseOS E4S (v.8.6) perf 4.18.0-372.158.1.el8_6, kernel 4.18.0-372.158.1.el8_6, bpftool 4.18.0-372.158.1.el8_6, kernel-core 4.18.0-372.158.1.el8_6, kernel-tools 4.18.0-372.158.1.el8_6, python3-perf 4.18.0-372.158.1.el8_6, +19 more
    fixed: vendor fix “To mitigate this issue, prevent module sch_hfsc 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-2025:14692
  • Red Hat Enterprise Linux BaseOS E4S (v.8.8) perf 4.18.0-477.107.1.el8_8, kernel 4.18.0-477.107.1.el8_8, bpftool 4.18.0-477.107.1.el8_8, kernel-core 4.18.0-477.107.1.el8_8, kernel-tools 4.18.0-477.107.1.el8_8, python3-perf 4.18.0-477.107.1.el8_8, +13 more
    fixed: vendor fix “To mitigate this issue, prevent module sch_hfsc 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-2025:14511
  • Red Hat Enterprise Linux BaseOS E4S (v.9.0) kernel 5.14.0-70.144.1.el9_0, bpftool 5.14.0-70.144.1.el9_0, kernel-core 5.14.0-70.144.1.el9_0, kernel-tools 5.14.0-70.144.1.el9_0, python3-perf 5.14.0-70.144.1.el9_0, kernel-modules 5.14.0-70.144.1.el9_0, +18 more
    fixed: vendor fix “To mitigate this issue, prevent module sch_hfsc 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-2025:14744
  • Red Hat Enterprise Linux BaseOS E4S (v.9.2) bpftool 7.0.0-284.128.1.el9_2, kernel 5.14.0-284.128.1.el9_2, kernel-64k 5.14.0-284.128.1.el9_2, kernel-core 5.14.0-284.128.1.el9_2, kernel-tools 5.14.0-284.128.1.el9_2, python3-perf 5.14.0-284.128.1.el9_2, +32 more
    fixed: vendor fix “To mitigate this issue, prevent module sch_hfsc 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-2025:12209
  • Red Hat Enterprise Linux BaseOS EUS (v.9.4) bpftool 7.3.0-427.81.1.el9_4, kernel 5.14.0-427.81.1.el9_4, kernel-64k 5.14.0-427.81.1.el9_4, kernel-core 5.14.0-427.81.1.el9_4, kernel-tools 5.14.0-427.81.1.el9_4, python3-perf 5.14.0-427.81.1.el9_4, +33 more
    fixed: vendor fix “To mitigate this issue, prevent module sch_hfsc 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-2025:13135
  • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) perf 4.18.0-305.170.1.el8_4, kernel 4.18.0-305.170.1.el8_4, bpftool 4.18.0-305.170.1.el8_4, kernel-core 4.18.0-305.170.1.el8_4, kernel-tools 4.18.0-305.170.1.el8_4, python3-perf 4.18.0-305.170.1.el8_4, +8 more
    fixed: vendor fix “To mitigate this issue, prevent module sch_hfsc 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-2025:15035
  • Red Hat Enterprise Linux BaseOS TUS (v.8.6) perf 4.18.0-372.158.1.el8_6, kernel 4.18.0-372.158.1.el8_6, bpftool 4.18.0-372.158.1.el8_6, kernel-core 4.18.0-372.158.1.el8_6, kernel-tools 4.18.0-372.158.1.el8_6, python3-perf 4.18.0-372.158.1.el8_6, +8 more
    fixed: vendor fix “To mitigate this issue, prevent module sch_hfsc 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-2025:14692
  • Red Hat Enterprise Linux BaseOS TUS (v.8.8) perf 4.18.0-477.107.1.el8_8, kernel 4.18.0-477.107.1.el8_8, bpftool 4.18.0-477.107.1.el8_8, kernel-core 4.18.0-477.107.1.el8_8, kernel-tools 4.18.0-477.107.1.el8_8, python3-perf 4.18.0-477.107.1.el8_8, +8 more
    fixed: vendor fix “To mitigate this issue, prevent module sch_hfsc 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-2025:14511
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libperf 5.14.0-570.32.1.el9_6, kernel-debuginfo-common-s390x 5.14.0-570.32.1.el9_6, kernel-debuginfo-common-x86_64 5.14.0-570.32.1.el9_6, kernel-debuginfo-common-aarch64 5.14.0-570.32.1.el9_6, kernel-debuginfo-common-ppc64le 5.14.0-570.32.1.el9_6
    fixed: vendor fix “To mitigate this issue, prevent module sch_hfsc 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-2025:12746
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libperf 6.12.0-55.25.1.el10_0, kernel-debuginfo-common-s390x 6.12.0-55.25.1.el10_0, kernel-debuginfo-common-x86_64 6.12.0-55.25.1.el10_0, kernel-debuginfo-common-aarch64 6.12.0-55.25.1.el10_0, kernel-debuginfo-common-ppc64le 6.12.0-55.25.1.el10_0
    fixed: vendor fix “To mitigate this issue, prevent module sch_hfsc 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-2025:12662
  • Red Hat Enterprise Linux CRB (v. 8) kernel-debuginfo-common-x86_64 4.18.0-553.66.1.el8_10, kernel-debuginfo-common-aarch64 4.18.0-553.66.1.el8_10, kernel-debuginfo-common-ppc64le 4.18.0-553.66.1.el8_10
    fixed: vendor fix “To mitigate this issue, prevent module sch_hfsc 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-2025:12752
  • Red Hat Enterprise Linux NFV (v. 8) kernel-rt 4.18.0-553.66.1.rt7.407.el8_10, kernel-rt-kvm 4.18.0-553.66.1.rt7.407.el8_10, kernel-rt-core 4.18.0-553.66.1.rt7.407.el8_10, kernel-rt-modules 4.18.0-553.66.1.rt7.407.el8_10, kernel-rt-debug-kvm 4.18.0-553.66.1.rt7.407.el8_10, kernel-rt-debug-core 4.18.0-553.66.1.rt7.407.el8_10, +4 more
    fixed: vendor fix “To mitigate this issue, prevent module sch_hfsc 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-2025:12753
  • Red Hat Enterprise Linux NFV E4S (v.9.0) kernel-rt 5.14.0-70.144.1.rt21.216.el9_0, kernel-rt-kvm 5.14.0-70.144.1.rt21.216.el9_0, kernel-rt-core 5.14.0-70.144.1.rt21.216.el9_0, kernel-rt-modules 5.14.0-70.144.1.rt21.216.el9_0, kernel-rt-debug-kvm 5.14.0-70.144.1.rt21.216.el9_0, kernel-rt-debug-core 5.14.0-70.144.1.rt21.216.el9_0, +4 more
    fixed: vendor fix “To mitigate this issue, prevent module sch_hfsc 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-2025:14749
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-570.32.1.el9_6, kernel-rt-64k 5.14.0-570.32.1.el9_6, kernel-rt-core 5.14.0-570.32.1.el9_6, kernel-rt-modules 5.14.0-570.32.1.el9_6, kernel-rt-64k-core 5.14.0-570.32.1.el9_6, kernel-rt-debug-core 5.14.0-570.32.1.el9_6, +14 more
    fixed: vendor fix “To mitigate this issue, prevent module sch_hfsc 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-2025:12746
  • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt 6.12.0-55.25.1.el10_0, kernel-rt-64k 6.12.0-55.25.1.el10_0, kernel-rt-core 6.12.0-55.25.1.el10_0, kernel-rt-modules 6.12.0-55.25.1.el10_0, kernel-rt-64k-core 6.12.0-55.25.1.el10_0, kernel-rt-debug-core 6.12.0-55.25.1.el10_0, +14 more
    fixed: vendor fix “To mitigate this issue, prevent module sch_hfsc 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-2025:12662
  • Red Hat Enterprise Linux Real Time E4S (v.9.0) kernel-rt 5.14.0-70.144.1.rt21.216.el9_0, kernel-rt-core 5.14.0-70.144.1.rt21.216.el9_0, kernel-rt-modules 5.14.0-70.144.1.rt21.216.el9_0, kernel-rt-debug-core 5.14.0-70.144.1.rt21.216.el9_0, kernel-rt-debug-modules 5.14.0-70.144.1.rt21.216.el9_0, kernel-rt-modules-extra 5.14.0-70.144.1.rt21.216.el9_0, +2 more
    fixed: vendor fix “To mitigate this issue, prevent module sch_hfsc 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-2025:14749
  • Red Hat Enterprise Linux Real Time EUS (v.9.4) kernel-rt 5.14.0-427.81.1.el9_4, kernel-rt-core 5.14.0-427.81.1.el9_4, kernel-rt-modules 5.14.0-427.81.1.el9_4, kernel-rt-debug-core 5.14.0-427.81.1.el9_4, kernel-rt-modules-core 5.14.0-427.81.1.el9_4, kernel-rt-debug-modules 5.14.0-427.81.1.el9_4, +4 more
    fixed: vendor fix “To mitigate this issue, prevent module sch_hfsc 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-2025:13135
  • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-570.32.1.el9_6, kernel-rt-kvm 5.14.0-570.32.1.el9_6, kernel-rt-core 5.14.0-570.32.1.el9_6, kernel-rt-modules 5.14.0-570.32.1.el9_6, kernel-rt-debug-kvm 5.14.0-570.32.1.el9_6, kernel-rt-debug-core 5.14.0-570.32.1.el9_6, +6 more
    fixed: vendor fix “To mitigate this issue, prevent module sch_hfsc 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-2025:12746
  • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt 6.12.0-55.25.1.el10_0, kernel-rt-kvm 6.12.0-55.25.1.el10_0, kernel-rt-core 6.12.0-55.25.1.el10_0, kernel-rt-modules 6.12.0-55.25.1.el10_0, kernel-rt-debug-kvm 6.12.0-55.25.1.el10_0, kernel-rt-debug-core 6.12.0-55.25.1.el10_0, +6 more
    fixed: vendor fix “To mitigate this issue, prevent module sch_hfsc 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-2025:12662
  • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.4) kernel-rt 5.14.0-427.81.1.el9_4, kernel-rt-kvm 5.14.0-427.81.1.el9_4, kernel-rt-core 5.14.0-427.81.1.el9_4, kernel-rt-modules 5.14.0-427.81.1.el9_4, kernel-rt-debug-kvm 5.14.0-427.81.1.el9_4, kernel-rt-debug-core 5.14.0-427.81.1.el9_4, +6 more
    fixed: vendor fix “To mitigate this issue, prevent module sch_hfsc 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-2025:13135
  • Red Hat Enterprise Linux RT (v. 8) kernel-rt 4.18.0-553.66.1.rt7.407.el8_10, kernel-rt-core 4.18.0-553.66.1.rt7.407.el8_10, kernel-rt-modules 4.18.0-553.66.1.rt7.407.el8_10, kernel-rt-debug-core 4.18.0-553.66.1.rt7.407.el8_10, kernel-rt-debug-modules 4.18.0-553.66.1.rt7.407.el8_10, kernel-rt-modules-extra 4.18.0-553.66.1.rt7.407.el8_10, +2 more
    fixed: vendor fix “To mitigate this issue, prevent module sch_hfsc 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-2025:12753
  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more 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
4 mo ago

Exploit prediction

0.22% chance of exploitation in the next 30 days, higher than 12% 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.