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Fencer Vulns
high 7.8

CVE-2025-37797 json

net_sched: hfsc: Fix a UAF vulnerability in class handling

published 2025-05-02 18 mo ago modified 2026-08-05 3 mo ago also EUVD-2025-13245

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 13%
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 handling

This patch fixes a Use-After-Free vulnerability in the HFSC qdisc class handling. The issue occurs due to a time-of-check/time-of-use condition in hfsc_change_class() when working with certain child qdiscs like netem or codel.

The vulnerability works as follows: 1. hfsc_change_class() checks if a class has packets (q.qlen != 0) 2. It then calls qdisc_peek_len(), which for certain qdiscs (e.g., codel, netem) might drop packets and empty the queue 3. The code continues assuming the queue is still non-empty, adding the class to vttree 4. This breaks HFSC scheduler assumptions that only non-empty classes are in vttree 5. Later, when the class is destroyed, this can lead to a Use-After-Free

The fix adds a second queue length check after qdisc_peek_len() to verify the queue wasn't emptied.

Patch / fix

  • Linux Linux 5.4.293, 5.10.237, 5.15.181, 6.1.136, 6.6.89, 6.12.26, 6.14.5, 6.15
  • linux Debian 12 6.1.137-1
  • linux Debian 14, Debian 13 6.12.27-1

debian advisories DEBIAN-CVE-2025-37797

  • linux Ubuntu 22.04 LTS 5.15.0-144.157
  • linux Ubuntu 24.04 LTS 6.8.0-71.71
  • linux-aws Ubuntu 22.04 LTS 5.15.0-1088.95
  • linux-aws Ubuntu 24.04 LTS 6.8.0-1033.35
  • linux-gcp Ubuntu 22.04 LTS 5.15.0-1087.96
  • linux-gcp Ubuntu 24.04 LTS 6.8.0-1034.36
  • linux-gke Ubuntu 22.04 LTS 5.15.0-1085.91
  • linux-gke Ubuntu 24.04 LTS 6.8.0-1029.33

ubuntu advisories UBUNTU-CVE-2025-37797

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-rt RHEL 8 4.18.0-553.77.1.rt7.418.el8_10
  • kernel-rt-kvm RHEL 8 4.18.0-553.77.1.rt7.418.el8_10
  • kernel-rt-core RHEL 8 4.18.0-553.77.1.rt7.418.el8_10
  • kernel-rt-modules RHEL 8 4.18.0-553.77.1.rt7.418.el8_10
  • kernel-rt-debug-kvm RHEL 8 4.18.0-553.77.1.rt7.418.el8_10
  • kernel-rt-debug-core RHEL 8 4.18.0-553.77.1.rt7.418.el8_10
  • kernel-rt-debug-modules RHEL 8 4.18.0-553.77.1.rt7.418.el8_10
  • kernel-rt-modules-extra RHEL 8 4.18.0-553.77.1.rt7.418.el8_10

red hat advisories RHSA-2025:22752RHSA-2025:21667RHSA-2025:21082RHSA-2025:21063RHSA-2025:19222RHSA-2025:18932

  • kernel-livepatch-MICRO-6-0-RT_Update_3 Linux Micro 6.0 9-1.2
  • kernel-livepatch-MICRO-6-0-RT_Update_4 Linux Micro 6.1, Linux Micro 6.0 6-1.1
  • kernel-livepatch-MICRO-6-0-RT_Update_5 Linux Micro 6.1, Linux Micro 6.0 5-1.1
  • kernel-livepatch-MICRO-6-0-RT_Update_6 Linux Micro 6.1, Linux Micro 6.0 3-3.1
  • kernel-livepatch-MICRO-6-0-RT_Update_7 Linux Micro 6.1, Linux Micro 6.0 3-1.3
  • kernel-livepatch-MICRO-6-0-RT_Update_8 Linux Micro 6.1, Linux Micro 6.0 2-1.2
  • kernel-livepatch-MICRO-6-0-RT_Update_2 Linux Micro 6.1, Linux Micro 6.0 9-1.1
  • kernel-livepatch-MICRO-6-0_Update_6 Linux Micro 6.1, Linux Micro 6.0 3-3.1

suse advisories SUSE-SU-2025:4123-1SUSE-SU-2025:20578-1SUSE-SU-2025:20579-1SUSE-SU-2025:20580-1SUSE-SU-2025:20581-1SUSE-SU-2025:20582-1

  • kernel AlmaLinux 8 4.18.0-553.77.1.el8_10
  • perf AlmaLinux 8 4.18.0-553.77.1.el8_10
  • bpftool AlmaLinux 8 4.18.0-553.77.1.el8_10
  • kernel-core AlmaLinux 8 4.18.0-553.77.1.el8_10
  • kernel-tools AlmaLinux 8 4.18.0-553.77.1.el8_10
  • python3-perf AlmaLinux 8 4.18.0-553.77.1.el8_10
  • kernel-modules AlmaLinux 8 4.18.0-553.77.1.el8_10
  • kernel-zfcpdump AlmaLinux 8 4.18.0-553.77.1.el8_10

almalinux advisories ALSA-2025:16919ALSA-2025:16920ALSA-2025:11855ALSA-2025:11861

  • kernel-rt Rocky Linux 8 4.18.0-553.77.1.rt7.418.el8_10
  • kernel Rocky Linux 8 4.18.0-553.77.1.el8_10
  • kernel Rocky Linux 9 5.14.0-570.30.1.el9_6
  • kernel Rocky Linux 10 6.12.0-55.24.1.el10_0

rocky linux advisories RLSA-2025:16920RLSA-2025:16919RLSA-2025:11861RLSA-2025:11855

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-2025-37797 updated cvss 7.0

kernel: net_sched: hfsc: Fix a UAF vulnerability in class handling

  • 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 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 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 5.14.0-427.83.1.el9_4, kernel-debuginfo-common-s390x 5.14.0-427.83.1.el9_4, kernel-debuginfo-common-x86_64 5.14.0-427.83.1.el9_4, kernel-debuginfo-common-aarch64 5.14.0-427.83.1.el9_4, kernel-debuginfo-common-ppc64le 5.14.0-427.83.1.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-2025:13946
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-570.30.1.el9_6, perf 5.14.0-570.30.1.el9_6, rtla 5.14.0-570.30.1.el9_6, python3-perf 5.14.0-570.30.1.el9_6, kernel-devel-matched 5.14.0-570.30.1.el9_6, kernel-64k-devel-matched 5.14.0-570.30.1.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-2025:11861
  • Red Hat Enterprise Linux AppStream (v. 10) rv 6.12.0-55.24.1.el10_0, perf 6.12.0-55.24.1.el10_0, rtla 6.12.0-55.24.1.el10_0, python3-perf 6.12.0-55.24.1.el10_0, kernel-devel-matched 6.12.0-55.24.1.el10_0, kernel-64k-devel-matched 6.12.0-55.24.1.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-2025:11855
  • Red Hat Enterprise Linux AppStream E4S (v.9.0) perf 5.14.0-70.142.1.el9_0, kernel-devel-matched 5.14.0-70.142.1.el9_0, kernel-debug-devel-matched 5.14.0-70.142.1.el9_0, kernel-debuginfo-common-s390x 5.14.0-70.142.1.el9_0, kernel-zfcpdump-devel-matched 5.14.0-70.142.1.el9_0, kernel-debuginfo-common-x86_64 5.14.0-70.142.1.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-2025:14054
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) perf 5.14.0-284.130.1.el9_2, rtla 5.14.0-284.130.1.el9_2, kernel-devel-matched 5.14.0-284.130.1.el9_2, kernel-64k-devel-matched 5.14.0-284.130.1.el9_2, kernel-debug-devel-matched 5.14.0-284.130.1.el9_2, kernel-debuginfo-common-s390x 5.14.0-284.130.1.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-2025:13781
  • Red Hat Enterprise Linux AppStream EUS (v.9.4) rv 5.14.0-427.83.1.el9_4, perf 5.14.0-427.83.1.el9_4, rtla 5.14.0-427.83.1.el9_4, kernel-devel-matched 5.14.0-427.83.1.el9_4, kernel-64k-devel-matched 5.14.0-427.83.1.el9_4, kernel-debug-devel-matched 5.14.0-427.83.1.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-2025:13946
show 30 more
  • Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-553.77.1.el8_10, kernel 4.18.0-553.77.1.el8_10, bpftool 4.18.0-553.77.1.el8_10, kernel-core 4.18.0-553.77.1.el8_10, kernel-tools 4.18.0-553.77.1.el8_10, python3-perf 4.18.0-553.77.1.el8_10, +15 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-2025:16919
  • Red Hat Enterprise Linux BaseOS (v. 9) kernel 5.14.0-570.30.1.el9_6, kernel-64k 5.14.0-570.30.1.el9_6, kernel-core 5.14.0-570.30.1.el9_6, kernel-tools 5.14.0-570.30.1.el9_6, kernel-modules 5.14.0-570.30.1.el9_6, kernel-64k-core 5.14.0-570.30.1.el9_6, +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-2025:11861
  • Red Hat Enterprise Linux BaseOS (v. 10) kernel 6.12.0-55.24.1.el10_0, kernel-64k 6.12.0-55.24.1.el10_0, kernel-core 6.12.0-55.24.1.el10_0, kernel-tools 6.12.0-55.24.1.el10_0, kernel-modules 6.12.0-55.24.1.el10_0, kernel-64k-core 6.12.0-55.24.1.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-2025:11855
  • Red Hat Enterprise Linux BaseOS AUS (v. 8.2) perf 4.18.0-193.173.1.el8_2, kernel 4.18.0-193.173.1.el8_2, bpftool 4.18.0-193.173.1.el8_2, kernel-core 4.18.0-193.173.1.el8_2, kernel-tools 4.18.0-193.173.1.el8_2, python3-perf 4.18.0-193.173.1.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-2025:21667
  • Red Hat Enterprise Linux BaseOS AUS (v.8.4) perf 4.18.0-305.179.1.el8_4, kernel 4.18.0-305.179.1.el8_4, bpftool 4.18.0-305.179.1.el8_4, kernel-core 4.18.0-305.179.1.el8_4, kernel-tools 4.18.0-305.179.1.el8_4, python3-perf 4.18.0-305.179.1.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-2025:22752
  • Red Hat Enterprise Linux BaseOS AUS (v.8.6) perf 4.18.0-372.166.1.el8_6, kernel 4.18.0-372.166.1.el8_6, bpftool 4.18.0-372.166.1.el8_6, kernel-core 4.18.0-372.166.1.el8_6, kernel-tools 4.18.0-372.166.1.el8_6, python3-perf 4.18.0-372.166.1.el8_6, +8 more Red Hat Enterprise Linux BaseOS E4S (v.8.6) perf 4.18.0-372.166.1.el8_6, kernel 4.18.0-372.166.1.el8_6, bpftool 4.18.0-372.166.1.el8_6, kernel-core 4.18.0-372.166.1.el8_6, kernel-tools 4.18.0-372.166.1.el8_6, python3-perf 4.18.0-372.166.1.el8_6, +15 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-2025:19222
  • Red Hat Enterprise Linux BaseOS E4S (v.8.8) perf 4.18.0-477.116.1.el8_8, kernel 4.18.0-477.116.1.el8_8, bpftool 4.18.0-477.116.1.el8_8, kernel-core 4.18.0-477.116.1.el8_8, kernel-tools 4.18.0-477.116.1.el8_8, python3-perf 4.18.0-477.116.1.el8_8, +9 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-2025:18932
  • Red Hat Enterprise Linux BaseOS E4S (v.9.0) kernel 5.14.0-70.142.1.el9_0, bpftool 5.14.0-70.142.1.el9_0, kernel-core 5.14.0-70.142.1.el9_0, kernel-tools 5.14.0-70.142.1.el9_0, python3-perf 5.14.0-70.142.1.el9_0, kernel-modules 5.14.0-70.142.1.el9_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-2025:14054
  • Red Hat Enterprise Linux BaseOS E4S (v.9.2) bpftool 7.0.0-284.130.1.el9_2, kernel 5.14.0-284.130.1.el9_2, kernel-64k 5.14.0-284.130.1.el9_2, kernel-core 5.14.0-284.130.1.el9_2, kernel-tools 5.14.0-284.130.1.el9_2, python3-perf 5.14.0-284.130.1.el9_2, +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-2025:13781
  • Red Hat Enterprise Linux BaseOS EUS (v.9.4) bpftool 7.3.0-427.83.1.el9_4, kernel 5.14.0-427.83.1.el9_4, kernel-64k 5.14.0-427.83.1.el9_4, kernel-core 5.14.0-427.83.1.el9_4, kernel-tools 5.14.0-427.83.1.el9_4, python3-perf 5.14.0-427.83.1.el9_4, +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-2025:13946
  • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) perf 4.18.0-305.179.1.el8_4, kernel 4.18.0-305.179.1.el8_4, bpftool 4.18.0-305.179.1.el8_4, kernel-core 4.18.0-305.179.1.el8_4, kernel-tools 4.18.0-305.179.1.el8_4, python3-perf 4.18.0-305.179.1.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-2025:22752
  • Red Hat Enterprise Linux BaseOS TUS (v.8.6) perf 4.18.0-372.166.1.el8_6, kernel 4.18.0-372.166.1.el8_6, bpftool 4.18.0-372.166.1.el8_6, kernel-core 4.18.0-372.166.1.el8_6, kernel-tools 4.18.0-372.166.1.el8_6, python3-perf 4.18.0-372.166.1.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-2025:19222
  • Red Hat Enterprise Linux BaseOS TUS (v.8.8) perf 4.18.0-477.116.1.el8_8, kernel 4.18.0-477.116.1.el8_8, bpftool 4.18.0-477.116.1.el8_8, kernel-core 4.18.0-477.116.1.el8_8, kernel-tools 4.18.0-477.116.1.el8_8, python3-perf 4.18.0-477.116.1.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-2025:18932
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libperf 5.14.0-570.30.1.el9_6, kernel-debuginfo-common-s390x 5.14.0-570.30.1.el9_6, kernel-debuginfo-common-x86_64 5.14.0-570.30.1.el9_6, kernel-debuginfo-common-aarch64 5.14.0-570.30.1.el9_6, kernel-debuginfo-common-ppc64le 5.14.0-570.30.1.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-2025:11861
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libperf 6.12.0-55.24.1.el10_0, kernel-debuginfo-common-s390x 6.12.0-55.24.1.el10_0, kernel-debuginfo-common-x86_64 6.12.0-55.24.1.el10_0, kernel-debuginfo-common-aarch64 6.12.0-55.24.1.el10_0, kernel-debuginfo-common-ppc64le 6.12.0-55.24.1.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-2025:11855
  • Red Hat Enterprise Linux CRB (v. 8) kernel-debuginfo-common-x86_64 4.18.0-553.77.1.el8_10, kernel-debuginfo-common-aarch64 4.18.0-553.77.1.el8_10, kernel-debuginfo-common-ppc64le 4.18.0-553.77.1.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-2025:16919
  • Red Hat Enterprise Linux for Real Time (v. 7 ELS) kernel-rt 3.10.0-1160.142.1.rt56.1294.el7, kernel-rt-trace 3.10.0-1160.142.1.rt56.1294.el7, kernel-rt-debuginfo-common-x86_64 3.10.0-1160.142.1.rt56.1294.el7
    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-2025:21082
  • Red Hat Enterprise Linux NFV (v. 8) kernel-rt 4.18.0-553.77.1.rt7.418.el8_10, kernel-rt-kvm 4.18.0-553.77.1.rt7.418.el8_10, kernel-rt-core 4.18.0-553.77.1.rt7.418.el8_10, kernel-rt-modules 4.18.0-553.77.1.rt7.418.el8_10, kernel-rt-debug-kvm 4.18.0-553.77.1.rt7.418.el8_10, kernel-rt-debug-core 4.18.0-553.77.1.rt7.418.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-2025:16920
  • Red Hat Enterprise Linux NFV E4S (v.9.0) kernel-rt 5.14.0-70.142.1.rt21.214.el9_0, kernel-rt-kvm 5.14.0-70.142.1.rt21.214.el9_0, kernel-rt-core 5.14.0-70.142.1.rt21.214.el9_0, kernel-rt-modules 5.14.0-70.142.1.rt21.214.el9_0, kernel-rt-debug-kvm 5.14.0-70.142.1.rt21.214.el9_0, kernel-rt-debug-core 5.14.0-70.142.1.rt21.214.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-2025:14094
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-570.30.1.el9_6, kernel-rt-64k 5.14.0-570.30.1.el9_6, kernel-rt-core 5.14.0-570.30.1.el9_6, kernel-rt-modules 5.14.0-570.30.1.el9_6, kernel-rt-64k-core 5.14.0-570.30.1.el9_6, kernel-rt-debug-core 5.14.0-570.30.1.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-2025:11861
  • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt 6.12.0-55.24.1.el10_0, kernel-rt-64k 6.12.0-55.24.1.el10_0, kernel-rt-core 6.12.0-55.24.1.el10_0, kernel-rt-modules 6.12.0-55.24.1.el10_0, kernel-rt-64k-core 6.12.0-55.24.1.el10_0, kernel-rt-debug-core 6.12.0-55.24.1.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-2025:11855
  • Red Hat Enterprise Linux Real Time E4S (v.9.0) kernel-rt 5.14.0-70.142.1.rt21.214.el9_0, kernel-rt-core 5.14.0-70.142.1.rt21.214.el9_0, kernel-rt-modules 5.14.0-70.142.1.rt21.214.el9_0, kernel-rt-debug-core 5.14.0-70.142.1.rt21.214.el9_0, kernel-rt-debug-modules 5.14.0-70.142.1.rt21.214.el9_0, kernel-rt-modules-extra 5.14.0-70.142.1.rt21.214.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-2025:14094
  • Red Hat Enterprise Linux Real Time E4S (v.9.2) kernel-rt 5.14.0-284.130.1.rt14.415.el9_2, kernel-rt-core 5.14.0-284.130.1.rt14.415.el9_2, kernel-rt-modules 5.14.0-284.130.1.rt14.415.el9_2, kernel-rt-debug-core 5.14.0-284.130.1.rt14.415.el9_2, kernel-rt-modules-core 5.14.0-284.130.1.rt14.415.el9_2, kernel-rt-debug-modules 5.14.0-284.130.1.rt14.415.el9_2, +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-2025:13633
  • Red Hat Enterprise Linux Real Time EUS (v.9.4) kernel-rt 5.14.0-427.83.1.el9_4, kernel-rt-core 5.14.0-427.83.1.el9_4, kernel-rt-modules 5.14.0-427.83.1.el9_4, kernel-rt-debug-core 5.14.0-427.83.1.el9_4, kernel-rt-modules-core 5.14.0-427.83.1.el9_4, kernel-rt-debug-modules 5.14.0-427.83.1.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-2025:13946
  • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-570.30.1.el9_6, kernel-rt-kvm 5.14.0-570.30.1.el9_6, kernel-rt-core 5.14.0-570.30.1.el9_6, kernel-rt-modules 5.14.0-570.30.1.el9_6, kernel-rt-debug-kvm 5.14.0-570.30.1.el9_6, kernel-rt-debug-core 5.14.0-570.30.1.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-2025:11861
  • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt 6.12.0-55.24.1.el10_0, kernel-rt-kvm 6.12.0-55.24.1.el10_0, kernel-rt-core 6.12.0-55.24.1.el10_0, kernel-rt-modules 6.12.0-55.24.1.el10_0, kernel-rt-debug-kvm 6.12.0-55.24.1.el10_0, kernel-rt-debug-core 6.12.0-55.24.1.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-2025:11855
  • Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2) kernel-rt 5.14.0-284.130.1.rt14.415.el9_2, kernel-rt-kvm 5.14.0-284.130.1.rt14.415.el9_2, kernel-rt-core 5.14.0-284.130.1.rt14.415.el9_2, kernel-rt-modules 5.14.0-284.130.1.rt14.415.el9_2, kernel-rt-debug-kvm 5.14.0-284.130.1.rt14.415.el9_2, kernel-rt-debug-core 5.14.0-284.130.1.rt14.415.el9_2, +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-2025:13633
  • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.4) kernel-rt 5.14.0-427.83.1.el9_4, kernel-rt-kvm 5.14.0-427.83.1.el9_4, kernel-rt-core 5.14.0-427.83.1.el9_4, kernel-rt-modules 5.14.0-427.83.1.el9_4, kernel-rt-debug-kvm 5.14.0-427.83.1.el9_4, kernel-rt-debug-core 5.14.0-427.83.1.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-2025:13946
  • Red Hat Enterprise Linux RT (v. 8) kernel-rt 4.18.0-553.77.1.rt7.418.el8_10, kernel-rt-core 4.18.0-553.77.1.rt7.418.el8_10, kernel-rt-modules 4.18.0-553.77.1.rt7.418.el8_10, kernel-rt-debug-core 4.18.0-553.77.1.rt7.418.el8_10, kernel-rt-debug-modules 4.18.0-553.77.1.rt7.418.el8_10, kernel-rt-modules-extra 4.18.0-553.77.1.rt7.418.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-2025:16920
  • Red Hat Enterprise Linux Server (v. 7 ELS) perf 3.10.0-1160.142.1.el7, kernel 3.10.0-1160.142.1.el7, bpftool 3.10.0-1160.142.1.el7, python-perf 3.10.0-1160.142.1.el7, kernel-kdump 3.10.0-1160.142.1.el7, kernel-tools 3.10.0-1160.142.1.el7, +7 more Red Hat Enterprise Linux Server Optional (v. 7 ELS) kernel-debuginfo-common-ppc64 3.10.0-1160.142.1.el7, kernel-debuginfo-common-x86_64 3.10.0-1160.142.1.el7, kernel-debuginfo-common-ppc64le 3.10.0-1160.142.1.el7
    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-2025:21063

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 13% 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.