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Fencer Vulns
high 7.8

CVE-2025-37914 json

net_sched: ets: Fix double list add in class with netem as child qdisc

published 2025-05-20 17 mo ago modified 2026-10-15 24 d ago also EUVD-2025-15922

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 14%
public exploits
0
none known

Summary

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

net_sched: ets: Fix double list add in class with netem as child qdisc

As described in Gerrard's report [1], there are use cases where a netem child qdisc will make the parent qdisc's enqueue callback reentrant. In the case of ets, there won't be a UAF, but the code will add the same classifier to the list twice, which will cause memory corruption.

In addition to checking for qlen being zero, this patch checks whether the class was already added to the active_list (cl_is_active) before doing the addition to cater for the reentrant case.

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

Patch / fix

  • Linux Linux 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-2025-37914

  • linux Ubuntu 22.04 LTS 5.15.0-144.157
  • linux Ubuntu 24.04 LTS 6.8.0-100.100
  • linux-aws Ubuntu 22.04 LTS 5.15.0-1088.95
  • linux-aws Ubuntu 24.04 LTS 6.8.0-1046.49
  • linux-gcp Ubuntu 22.04 LTS 5.15.0-1087.96
  • linux-gcp Ubuntu 24.04 LTS 6.8.0-1047.50
  • linux-gke Ubuntu 22.04 LTS 5.15.0-1085.91
  • linux-gke Ubuntu 24.04 LTS 6.8.0-1043.48

ubuntu advisories UBUNTU-CVE-2025-37914

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 10.0 6.12.0-55.29.1.el10_0
  • rv RHEL 10.0 6.12.0-55.29.1.el10_0
  • perf RHEL 10.0 6.12.0-55.29.1.el10_0
  • rtla RHEL 10.0 6.12.0-55.29.1.el10_0
  • libperf RHEL 10.0 6.12.0-55.29.1.el10_0
  • kernel-rt RHEL 10.0 6.12.0-55.29.1.el10_0
  • kernel-64k RHEL 10.0 6.12.0-55.29.1.el10_0
  • kernel-core RHEL 10.0 6.12.0-55.29.1.el10_0

red hat advisories RHSA-2025:22752RHSA-2025:18098RHSA-2025:18054RHSA-2025:18043RHSA-2025:17735RHSA-2025:17734

  • kernel-coco SLE Module for Confidential Computing Technical Preview 15 SP6 6.4.0-15061.28.coco15sp6.1
  • kernel-syms-coco SLE Module for Confidential Computing Technical Preview 15 SP6 6.4.0-15061.28.coco15sp6.1
  • kernel-coco_debug SLE Module for Confidential Computing Technical Preview 15 SP6 6.4.0-15061.28.coco15sp6.1
  • kernel-source-coco SLE Module for Confidential Computing Technical Preview 15 SP6 6.4.0-15061.28.coco15sp6.1
  • kernel-rt Real Time Module 15 SP7 6.4.0-150700.7.8.1
  • kernel-syms-rt Real Time Module 15 SP7 6.4.0-150700.7.8.1
  • kernel-source-rt Real Time Module 15 SP7 6.4.0-150700.7.8.1
  • kernel-64kb SLE Module for Basesystem 15 SP7 6.4.0-150700.53.6.1

suse advisories SUSE-SU-2025:02923-1SUSE-SU-2025:02333-1SUSE-SU-2025:02307-1SUSE-SU-2025:02254-1SUSE-SU-2025:02000-1SUSE-SU-2025:20413-1

  • kernel AlmaLinux 9 5.14.0-570.37.1.el9_6
  • rv AlmaLinux 9 5.14.0-570.37.1.el9_6
  • perf AlmaLinux 9 5.14.0-570.37.1.el9_6
  • rtla AlmaLinux 9 5.14.0-570.37.1.el9_6
  • libperf AlmaLinux 9 5.14.0-570.37.1.el9_6
  • kernel-rt AlmaLinux 9 5.14.0-570.37.1.el9_6
  • kernel-64k AlmaLinux 9 5.14.0-570.37.1.el9_6
  • kernel-core AlmaLinux 9 5.14.0-570.37.1.el9_6

almalinux advisories ALSA-2025:14420ALSA-2025:14510ALSA-2025:13960ALSA-2025:13961

  • kernel Rocky Linux 9 5.14.0-570.37.1.el9_6
  • kernel Rocky Linux 10 6.12.0-55.29.1.el10_0

rocky linux advisories RLSA-2025:14420RLSA-2025:14510

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-2025-37914 updated cvss 7.0

kernel: net_sched: ets: Fix double list add in class with netem as child qdisc

  • Red Hat CodeReady Linux Builder EUS (v.9.4) libperf 5.14.0-427.88.1.el9_4, kernel-debuginfo-common-s390x 5.14.0-427.88.1.el9_4, kernel-debuginfo-common-x86_64 5.14.0-427.88.1.el9_4, kernel-debuginfo-common-aarch64 5.14.0-427.88.1.el9_4, kernel-debuginfo-common-ppc64le 5.14.0-427.88.1.el9_4
    fixed: vendor fix RHSA-2025:15668
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-570.37.1.el9_6, perf 5.14.0-570.37.1.el9_6, rtla 5.14.0-570.37.1.el9_6, python3-perf 5.14.0-570.37.1.el9_6, kernel-devel-matched 5.14.0-570.37.1.el9_6, kernel-64k-devel-matched 5.14.0-570.37.1.el9_6, +7 more
    fixed: vendor fix RHSA-2025:14420
  • Red Hat Enterprise Linux AppStream (v. 10) rv 6.12.0-55.29.1.el10_0, perf 6.12.0-55.29.1.el10_0, rtla 6.12.0-55.29.1.el10_0, python3-perf 6.12.0-55.29.1.el10_0, kernel-devel-matched 6.12.0-55.29.1.el10_0, kernel-64k-devel-matched 6.12.0-55.29.1.el10_0, +7 more
    fixed: vendor fix RHSA-2025:14510
  • Red Hat Enterprise Linux AppStream E4S (v.9.0) perf 5.14.0-70.149.1.el9_0, kernel-devel-matched 5.14.0-70.149.1.el9_0, kernel-debug-devel-matched 5.14.0-70.149.1.el9_0, kernel-debuginfo-common-s390x 5.14.0-70.149.1.el9_0, kernel-zfcpdump-devel-matched 5.14.0-70.149.1.el9_0, kernel-debuginfo-common-x86_64 5.14.0-70.149.1.el9_0, +2 more
    fixed: vendor fix RHSA-2025:18054
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) perf 5.14.0-284.142.1.el9_2, rtla 5.14.0-284.142.1.el9_2, kernel-devel-matched 5.14.0-284.142.1.el9_2, kernel-64k-devel-matched 5.14.0-284.142.1.el9_2, kernel-debug-devel-matched 5.14.0-284.142.1.el9_2, kernel-debuginfo-common-s390x 5.14.0-284.142.1.el9_2, +5 more
    fixed: vendor fix RHSA-2025:17734
  • Red Hat Enterprise Linux AppStream EUS (v.9.4) rv 5.14.0-427.88.1.el9_4, perf 5.14.0-427.88.1.el9_4, rtla 5.14.0-427.88.1.el9_4, kernel-devel-matched 5.14.0-427.88.1.el9_4, kernel-64k-devel-matched 5.14.0-427.88.1.el9_4, kernel-debug-devel-matched 5.14.0-427.88.1.el9_4, +6 more
    fixed: vendor fix RHSA-2025:15668
  • Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-553.70.1.el8_10, kernel 4.18.0-553.70.1.el8_10, bpftool 4.18.0-553.70.1.el8_10, kernel-core 4.18.0-553.70.1.el8_10, kernel-tools 4.18.0-553.70.1.el8_10, python3-perf 4.18.0-553.70.1.el8_10, +15 more
    fixed: vendor fix RHSA-2025:13960
  • Red Hat Enterprise Linux BaseOS (v. 9) kernel 5.14.0-570.37.1.el9_6, kernel-64k 5.14.0-570.37.1.el9_6, kernel-core 5.14.0-570.37.1.el9_6, kernel-tools 5.14.0-570.37.1.el9_6, kernel-modules 5.14.0-570.37.1.el9_6, kernel-64k-core 5.14.0-570.37.1.el9_6, +27 more
    fixed: vendor fix RHSA-2025:14420
show 26 more
  • Red Hat Enterprise Linux BaseOS (v. 10) kernel 6.12.0-55.29.1.el10_0, kernel-64k 6.12.0-55.29.1.el10_0, kernel-core 6.12.0-55.29.1.el10_0, kernel-tools 6.12.0-55.29.1.el10_0, kernel-modules 6.12.0-55.29.1.el10_0, kernel-64k-core 6.12.0-55.29.1.el10_0, +27 more
    fixed: vendor fix RHSA-2025:14510
  • 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 RHSA-2025:22752
  • Red Hat Enterprise Linux BaseOS AUS (v.8.6) perf 4.18.0-372.164.1.el8_6, kernel 4.18.0-372.164.1.el8_6, bpftool 4.18.0-372.164.1.el8_6, kernel-core 4.18.0-372.164.1.el8_6, kernel-tools 4.18.0-372.164.1.el8_6, python3-perf 4.18.0-372.164.1.el8_6, +8 more Red Hat Enterprise Linux BaseOS E4S (v.8.6) perf 4.18.0-372.164.1.el8_6, kernel 4.18.0-372.164.1.el8_6, bpftool 4.18.0-372.164.1.el8_6, kernel-core 4.18.0-372.164.1.el8_6, kernel-tools 4.18.0-372.164.1.el8_6, python3-perf 4.18.0-372.164.1.el8_6, +15 more
    fixed: vendor fix RHSA-2025:18043
  • Red Hat Enterprise Linux BaseOS E4S (v.8.8) perf 4.18.0-477.114.1.el8_8, kernel 4.18.0-477.114.1.el8_8, bpftool 4.18.0-477.114.1.el8_8, kernel-core 4.18.0-477.114.1.el8_8, kernel-tools 4.18.0-477.114.1.el8_8, python3-perf 4.18.0-477.114.1.el8_8, +9 more
    fixed: vendor fix RHSA-2025:17570
  • Red Hat Enterprise Linux BaseOS E4S (v.9.0) kernel 5.14.0-70.149.1.el9_0, bpftool 5.14.0-70.149.1.el9_0, kernel-core 5.14.0-70.149.1.el9_0, kernel-tools 5.14.0-70.149.1.el9_0, python3-perf 5.14.0-70.149.1.el9_0, kernel-modules 5.14.0-70.149.1.el9_0, +14 more
    fixed: vendor fix RHSA-2025:18054
  • Red Hat Enterprise Linux BaseOS E4S (v.9.2) bpftool 7.0.0-284.142.1.el9_2, kernel 5.14.0-284.142.1.el9_2, kernel-64k 5.14.0-284.142.1.el9_2, kernel-core 5.14.0-284.142.1.el9_2, kernel-tools 5.14.0-284.142.1.el9_2, python3-perf 5.14.0-284.142.1.el9_2, +28 more
    fixed: vendor fix RHSA-2025:17734
  • Red Hat Enterprise Linux BaseOS EUS (v.9.4) bpftool 7.3.0-427.88.1.el9_4, kernel 5.14.0-427.88.1.el9_4, kernel-64k 5.14.0-427.88.1.el9_4, kernel-core 5.14.0-427.88.1.el9_4, kernel-tools 5.14.0-427.88.1.el9_4, python3-perf 5.14.0-427.88.1.el9_4, +28 more
    fixed: vendor fix RHSA-2025:15668
  • 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 RHSA-2025:22752
  • Red Hat Enterprise Linux BaseOS TUS (v.8.6) perf 4.18.0-372.164.1.el8_6, kernel 4.18.0-372.164.1.el8_6, bpftool 4.18.0-372.164.1.el8_6, kernel-core 4.18.0-372.164.1.el8_6, kernel-tools 4.18.0-372.164.1.el8_6, python3-perf 4.18.0-372.164.1.el8_6, +8 more
    fixed: vendor fix RHSA-2025:18043
  • Red Hat Enterprise Linux BaseOS TUS (v.8.8) perf 4.18.0-477.114.1.el8_8, kernel 4.18.0-477.114.1.el8_8, bpftool 4.18.0-477.114.1.el8_8, kernel-core 4.18.0-477.114.1.el8_8, kernel-tools 4.18.0-477.114.1.el8_8, python3-perf 4.18.0-477.114.1.el8_8, +8 more
    fixed: vendor fix RHSA-2025:17570
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libperf 5.14.0-570.37.1.el9_6, kernel-debuginfo-common-s390x 5.14.0-570.37.1.el9_6, kernel-debuginfo-common-x86_64 5.14.0-570.37.1.el9_6, kernel-debuginfo-common-aarch64 5.14.0-570.37.1.el9_6, kernel-debuginfo-common-ppc64le 5.14.0-570.37.1.el9_6
    fixed: vendor fix RHSA-2025:14420
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libperf 6.12.0-55.29.1.el10_0, kernel-debuginfo-common-s390x 6.12.0-55.29.1.el10_0, kernel-debuginfo-common-x86_64 6.12.0-55.29.1.el10_0, kernel-debuginfo-common-aarch64 6.12.0-55.29.1.el10_0, kernel-debuginfo-common-ppc64le 6.12.0-55.29.1.el10_0
    fixed: vendor fix RHSA-2025:14510
  • Red Hat Enterprise Linux CRB (v. 8) kernel-debuginfo-common-x86_64 4.18.0-553.70.1.el8_10, kernel-debuginfo-common-aarch64 4.18.0-553.70.1.el8_10, kernel-debuginfo-common-ppc64le 4.18.0-553.70.1.el8_10
    fixed: vendor fix RHSA-2025:13960
  • Red Hat Enterprise Linux NFV (v. 8) kernel-rt 4.18.0-553.70.1.rt7.411.el8_10, kernel-rt-kvm 4.18.0-553.70.1.rt7.411.el8_10, kernel-rt-core 4.18.0-553.70.1.rt7.411.el8_10, kernel-rt-modules 4.18.0-553.70.1.rt7.411.el8_10, kernel-rt-debug-kvm 4.18.0-553.70.1.rt7.411.el8_10, kernel-rt-debug-core 4.18.0-553.70.1.rt7.411.el8_10, +4 more
    fixed: vendor fix RHSA-2025:13961
  • Red Hat Enterprise Linux NFV E4S (v.9.0) kernel-rt 5.14.0-70.149.1.rt21.221.el9_0, kernel-rt-kvm 5.14.0-70.149.1.rt21.221.el9_0, kernel-rt-core 5.14.0-70.149.1.rt21.221.el9_0, kernel-rt-modules 5.14.0-70.149.1.rt21.221.el9_0, kernel-rt-debug-kvm 5.14.0-70.149.1.rt21.221.el9_0, kernel-rt-debug-core 5.14.0-70.149.1.rt21.221.el9_0, +4 more
    fixed: vendor fix RHSA-2025:18098
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-570.37.1.el9_6, kernel-rt-64k 5.14.0-570.37.1.el9_6, kernel-rt-core 5.14.0-570.37.1.el9_6, kernel-rt-modules 5.14.0-570.37.1.el9_6, kernel-rt-64k-core 5.14.0-570.37.1.el9_6, kernel-rt-debug-core 5.14.0-570.37.1.el9_6, +14 more
    fixed: vendor fix RHSA-2025:14420
  • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt 6.12.0-55.29.1.el10_0, kernel-rt-64k 6.12.0-55.29.1.el10_0, kernel-rt-core 6.12.0-55.29.1.el10_0, kernel-rt-modules 6.12.0-55.29.1.el10_0, kernel-rt-64k-core 6.12.0-55.29.1.el10_0, kernel-rt-debug-core 6.12.0-55.29.1.el10_0, +14 more
    fixed: vendor fix RHSA-2025:14510
  • Red Hat Enterprise Linux Real Time E4S (v.9.0) kernel-rt 5.14.0-70.149.1.rt21.221.el9_0, kernel-rt-core 5.14.0-70.149.1.rt21.221.el9_0, kernel-rt-modules 5.14.0-70.149.1.rt21.221.el9_0, kernel-rt-debug-core 5.14.0-70.149.1.rt21.221.el9_0, kernel-rt-debug-modules 5.14.0-70.149.1.rt21.221.el9_0, kernel-rt-modules-extra 5.14.0-70.149.1.rt21.221.el9_0, +2 more
    fixed: vendor fix RHSA-2025:18098
  • Red Hat Enterprise Linux Real Time E4S (v.9.2) kernel-rt 5.14.0-284.142.1.rt14.427.el9_2, kernel-rt-core 5.14.0-284.142.1.rt14.427.el9_2, kernel-rt-modules 5.14.0-284.142.1.rt14.427.el9_2, kernel-rt-debug-core 5.14.0-284.142.1.rt14.427.el9_2, kernel-rt-modules-core 5.14.0-284.142.1.rt14.427.el9_2, kernel-rt-debug-modules 5.14.0-284.142.1.rt14.427.el9_2, +4 more
    fixed: vendor fix RHSA-2025:17735
  • Red Hat Enterprise Linux Real Time EUS (v.9.4) kernel-rt 5.14.0-427.88.1.el9_4, kernel-rt-core 5.14.0-427.88.1.el9_4, kernel-rt-modules 5.14.0-427.88.1.el9_4, kernel-rt-debug-core 5.14.0-427.88.1.el9_4, kernel-rt-modules-core 5.14.0-427.88.1.el9_4, kernel-rt-debug-modules 5.14.0-427.88.1.el9_4, +4 more
    fixed: vendor fix RHSA-2025:15668
  • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-570.37.1.el9_6, kernel-rt-kvm 5.14.0-570.37.1.el9_6, kernel-rt-core 5.14.0-570.37.1.el9_6, kernel-rt-modules 5.14.0-570.37.1.el9_6, kernel-rt-debug-kvm 5.14.0-570.37.1.el9_6, kernel-rt-debug-core 5.14.0-570.37.1.el9_6, +6 more
    fixed: vendor fix RHSA-2025:14420
  • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt 6.12.0-55.29.1.el10_0, kernel-rt-kvm 6.12.0-55.29.1.el10_0, kernel-rt-core 6.12.0-55.29.1.el10_0, kernel-rt-modules 6.12.0-55.29.1.el10_0, kernel-rt-debug-kvm 6.12.0-55.29.1.el10_0, kernel-rt-debug-core 6.12.0-55.29.1.el10_0, +6 more
    fixed: vendor fix RHSA-2025:14510
  • Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2) kernel-rt 5.14.0-284.142.1.rt14.427.el9_2, kernel-rt-kvm 5.14.0-284.142.1.rt14.427.el9_2, kernel-rt-core 5.14.0-284.142.1.rt14.427.el9_2, kernel-rt-modules 5.14.0-284.142.1.rt14.427.el9_2, kernel-rt-debug-kvm 5.14.0-284.142.1.rt14.427.el9_2, kernel-rt-debug-core 5.14.0-284.142.1.rt14.427.el9_2, +6 more
    fixed: vendor fix RHSA-2025:17735
  • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.4) kernel-rt 5.14.0-427.88.1.el9_4, kernel-rt-kvm 5.14.0-427.88.1.el9_4, kernel-rt-core 5.14.0-427.88.1.el9_4, kernel-rt-modules 5.14.0-427.88.1.el9_4, kernel-rt-debug-kvm 5.14.0-427.88.1.el9_4, kernel-rt-debug-core 5.14.0-427.88.1.el9_4, +6 more
    fixed: vendor fix RHSA-2025:15668
  • Red Hat Enterprise Linux RT (v. 8) kernel-rt 4.18.0-553.70.1.rt7.411.el8_10, kernel-rt-core 4.18.0-553.70.1.rt7.411.el8_10, kernel-rt-modules 4.18.0-553.70.1.rt7.411.el8_10, kernel-rt-debug-core 4.18.0-553.70.1.rt7.411.el8_10, kernel-rt-debug-modules 4.18.0-553.70.1.rt7.411.el8_10, kernel-rt-modules-extra 4.18.0-553.70.1.rt7.411.el8_10, +2 more
    fixed: vendor fix RHSA-2025:13961
  • 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 Red Hat Enterprise Linux AppStream EUS (v.9.4) kernel-doc 5.14.0-427.88.1.el9_4
    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
24 d ago

Exploit prediction

0.23% chance of exploitation in the next 30 days, higher than 14% 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.