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Fencer Vulns
high 7.8

CVE-2025-38352 kev in the critical feed json

posix-cpu-timers: fix race between handle_posix_cpu_timers() and posix_cpu_timer_del()

published 2025-07-22 15 mo ago modified 2026-09-08 2 mo ago also EUVD-2025-22297

cvss
7.8
version 3.1, CNA
cisa kev
Exploited
added 2025-09-04
epss
1.4%
EPSS 1.4% chance of exploitation in 30 days, percentile 71%
public exploits
0
none known

Summary

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

posix-cpu-timers: fix race between handle_posix_cpu_timers() and posix_cpu_timer_del()

If an exiting non-autoreaping task has already passed exit_notify() and calls handle_posix_cpu_timers() from IRQ, it can be reaped by its parent or debugger right after unlock_task_sighand().

If a concurrent posix_cpu_timer_del() runs at that moment, it won't be able to detect timer->it.cpu.firing != 0: cpu_timer_task_rcu() and/or lock_task_sighand() will fail.

Add the tsk->exit_state check into run_posix_cpu_timers() to fix this.

This fix is not needed if CONFIG_POSIX_CPU_TIMERS_TASK_WORK=y, because exit_task_work() is called before exit_notify(). But the check still makes sense, task_work_add(&tsk->posix_cputimers_work.work) will fail anyway in this case.

Patch / fix

cisa required action Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

  • Linux Linux 5.4.295, 5.10.239, 5.15.186, 6.1.142, 6.6.94, 6.12.34, 6.15.3, 6.16
  • linux Debian 12 6.1.147-1
  • linux Debian 14, Debian 13 6.12.35-1

debian advisories DEBIAN-CVE-2025-38352

  • linux Ubuntu 22.04 LTS 5.15.0-156.166
  • linux Ubuntu 24.04 LTS 6.8.0-87.88
  • linux-aws Ubuntu 22.04 LTS 5.15.0-1092.99
  • linux-aws Ubuntu 24.04 LTS 6.8.0-1042.44
  • linux-gcp Ubuntu 22.04 LTS 5.15.0-1092.101
  • linux-gcp Ubuntu 24.04 LTS 6.8.0-1043.46
  • linux-gke Ubuntu 22.04 LTS 5.15.0-1089.95
  • linux-gke Ubuntu 24.04 LTS 6.8.0-1039.44

ubuntu advisories UBUNTU-CVE-2025-38352

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 1-1.el8_10
  • kpatch-patch-4_18_0-553_16_1 RHEL 8 1-8.el8_10
  • kpatch-patch-4_18_0-553_30_1 RHEL 8 1-7.el8_10
  • kpatch-patch-4_18_0-553_40_1 RHEL 8 1-5.el8_10
  • kpatch-patch-4_18_0-553_53_1 RHEL 8 1-3.el8_10
  • kpatch-patch-5_14_0-570_17_1 RHEL 9 1-8.el9_6
  • kpatch-patch-5_14_0-570_39_1 RHEL 9 1-1.el9_6
  • kernel RHEL 10.0 6.12.0-55.32.1.el10_0

red hat advisories RHSA-2025:16045RHSA-2025:16008RHSA-2025:15931RHSA-2025:15933RHSA-2025:15932RHSA-2025:15921

  • kernel-livepatch-SLE16-RT_Update_0 Linux Micro 6.2 5-160000.3.4
  • kernel-livepatch-SLE16_Update_0 SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 7-160000.4.3
  • kernel-livepatch-MICRO-6-0-RT_Update_10 Linux Micro 6.1, Linux Micro 6.0 10-1.1
  • kernel-livepatch-MICRO-6-0-RT_Update_6 Linux Micro 6.1, Linux Micro 6.0 12-3.1
  • kernel-livepatch-MICRO-6-0-RT_Update_7 Linux Micro 6.1, Linux Micro 6.0 12-1.3
  • kernel-livepatch-MICRO-6-0-RT_Update_8 Linux Micro 6.1, Linux Micro 6.0 11-1.2
  • kernel-livepatch-MICRO-6-0-RT_Update_9 Linux Micro 6.1, Linux Micro 6.0 10-1.2
  • kernel-livepatch-MICRO-6-0_Update_4 Linux Micro 6.1, Linux Micro 6.0 17-1.2

suse advisories SUSE-SU-2026:20645-1SUSE-SU-2026:20635-1SUSE-SU-2026:20644-1SUSE-SU-2026:20470-1SUSE-SU-2026:20516-1SUSE-SU-2026:20456-1

  • kernel-rt openSUSE Leap 16.0 6.12.0-160000.6.1
  • dtb-aarch64 openSUSE Leap 16.0 6.12.0-160000.6.1
  • kernel-64kb openSUSE Leap 16.0 6.12.0-160000.6.1
  • kernel-syms openSUSE Leap 16.0 6.12.0-160000.6.1
  • kernel-obs-qa openSUSE Leap 16.0 6.12.0-160000.6.1
  • kernel-source openSUSE Leap 16.0 6.12.0-160000.6.1
  • kernel-default openSUSE Leap 16.0 6.12.0-160000.6.1
  • kernel-kvmsmall openSUSE Leap 16.0 6.12.0-160000.6.1

opensuse advisories openSUSE-SU-2025:20081-1

  • kernel AlmaLinux 9 5.14.0-570.42.2.el9_6
  • rv AlmaLinux 9 5.14.0-570.42.2.el9_6
  • perf AlmaLinux 9 5.14.0-570.42.2.el9_6
  • rtla AlmaLinux 9 5.14.0-570.42.2.el9_6
  • libperf AlmaLinux 9 5.14.0-570.42.2.el9_6
  • kernel-rt AlmaLinux 9 5.14.0-570.42.2.el9_6
  • kernel-64k AlmaLinux 9 5.14.0-570.42.2.el9_6
  • kernel-core AlmaLinux 9 5.14.0-570.42.2.el9_6

almalinux advisories ALSA-2025:15661ALSA-2025:15662ALSA-2025:15471ALSA-2025:15472

  • kernel Rocky Linux 9 5.14.0-570.42.2.el9_6
  • kernel Rocky Linux 10 6.12.0-55.32.1.el10_0
  • kernel Rocky Linux 8 4.18.0-553.74.1.el8_10

rocky linux advisories RLSA-2025:15661RLSA-2025:15662RLSA-2025:15471

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-2025-38352 updated cvss 4.7

kernel: posix-cpu-timers: fix race between handle_posix_cpu_timers() and posix_cpu_timer_del()

  • 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 5.14.0-570.42.2.el9_6, perf 5.14.0-570.42.2.el9_6, rtla 5.14.0-570.42.2.el9_6, python3-perf 5.14.0-570.42.2.el9_6, kernel-devel-matched 5.14.0-570.42.2.el9_6, kernel-64k-devel-matched 5.14.0-570.42.2.el9_6, +7 more
    fixed: vendor fix RHSA-2025:15661
  • Red Hat Enterprise Linux AppStream (v. 10) rv 6.12.0-55.32.1.el10_0, perf 6.12.0-55.32.1.el10_0, rtla 6.12.0-55.32.1.el10_0, python3-perf 6.12.0-55.32.1.el10_0, kernel-devel-matched 6.12.0-55.32.1.el10_0, kernel-64k-devel-matched 6.12.0-55.32.1.el10_0, +7 more
    fixed: vendor fix RHSA-2025:15662
  • Red Hat Enterprise Linux AppStream E4S (v.9.0) perf 5.14.0-70.146.1.el9_0, kernel-devel-matched 5.14.0-70.146.1.el9_0, kernel-debug-devel-matched 5.14.0-70.146.1.el9_0, kernel-debuginfo-common-s390x 5.14.0-70.146.1.el9_0, kernel-zfcpdump-devel-matched 5.14.0-70.146.1.el9_0, kernel-debuginfo-common-x86_64 5.14.0-70.146.1.el9_0, +2 more
    fixed: vendor fix RHSA-2025:15670
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) perf 5.14.0-284.137.1.el9_2, rtla 5.14.0-284.137.1.el9_2, kernel-devel-matched 5.14.0-284.137.1.el9_2, kernel-64k-devel-matched 5.14.0-284.137.1.el9_2, kernel-debug-devel-matched 5.14.0-284.137.1.el9_2, kernel-debuginfo-common-s390x 5.14.0-284.137.1.el9_2, +5 more
    fixed: vendor fix RHSA-2025:15669
  • 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 4.18.0-553.74.1.el8_10, kernel 4.18.0-553.74.1.el8_10, bpftool 4.18.0-553.74.1.el8_10, kernel-core 4.18.0-553.74.1.el8_10, kernel-tools 4.18.0-553.74.1.el8_10, python3-perf 4.18.0-553.74.1.el8_10, +20 more
    fixed: vendor fix RHSA-2025:15471
  • Red Hat Enterprise Linux BaseOS (v. 9) kernel 5.14.0-570.42.2.el9_6, kernel-64k 5.14.0-570.42.2.el9_6, kernel-core 5.14.0-570.42.2.el9_6, kernel-tools 5.14.0-570.42.2.el9_6, kernel-modules 5.14.0-570.42.2.el9_6, kernel-64k-core 5.14.0-570.42.2.el9_6, +29 more
    fixed: vendor fix RHSA-2025:15661
show 28 more
  • Red Hat Enterprise Linux BaseOS (v. 10) kernel 6.12.0-55.32.1.el10_0, kernel-64k 6.12.0-55.32.1.el10_0, kernel-core 6.12.0-55.32.1.el10_0, kernel-tools 6.12.0-55.32.1.el10_0, kernel-modules 6.12.0-55.32.1.el10_0, kernel-64k-core 6.12.0-55.32.1.el10_0, +27 more
    fixed: vendor fix RHSA-2025:15662
  • Red Hat Enterprise Linux BaseOS AUS (v. 8.2) perf 4.18.0-193.168.1.el8_2, kernel 4.18.0-193.168.1.el8_2, bpftool 4.18.0-193.168.1.el8_2, kernel-core 4.18.0-193.168.1.el8_2, kernel-tools 4.18.0-193.168.1.el8_2, python3-perf 4.18.0-193.168.1.el8_2, +8 more
    fixed: vendor fix RHSA-2025:15656
  • Red Hat Enterprise Linux BaseOS AUS (v.8.4) perf 4.18.0-305.172.1.el8_4, kernel 4.18.0-305.172.1.el8_4, bpftool 4.18.0-305.172.1.el8_4, kernel-core 4.18.0-305.172.1.el8_4, kernel-tools 4.18.0-305.172.1.el8_4, python3-perf 4.18.0-305.172.1.el8_4, +8 more
    fixed: vendor fix RHSA-2025:15660
  • Red Hat Enterprise Linux BaseOS AUS (v.8.6) perf 4.18.0-372.160.1.el8_6, kernel 4.18.0-372.160.1.el8_6, bpftool 4.18.0-372.160.1.el8_6, kernel-core 4.18.0-372.160.1.el8_6, kernel-tools 4.18.0-372.160.1.el8_6, python3-perf 4.18.0-372.160.1.el8_6, +8 more Red Hat Enterprise Linux BaseOS E4S (v.8.6) perf 4.18.0-372.160.1.el8_6, kernel 4.18.0-372.160.1.el8_6, bpftool 4.18.0-372.160.1.el8_6, kernel-core 4.18.0-372.160.1.el8_6, kernel-tools 4.18.0-372.160.1.el8_6, python3-perf 4.18.0-372.160.1.el8_6, +20 more
    fixed: vendor fix RHSA-2025:15647
  • Red Hat Enterprise Linux BaseOS E4S (v.8.8) perf 4.18.0-477.110.1.el8_8, kernel 4.18.0-477.110.1.el8_8, bpftool 4.18.0-477.110.1.el8_8, kernel-core 4.18.0-477.110.1.el8_8, kernel-tools 4.18.0-477.110.1.el8_8, python3-perf 4.18.0-477.110.1.el8_8, +14 more
    fixed: vendor fix RHSA-2025:15649
  • Red Hat Enterprise Linux BaseOS E4S (v.9.0) kernel 5.14.0-70.146.1.el9_0, bpftool 5.14.0-70.146.1.el9_0, kernel-core 5.14.0-70.146.1.el9_0, kernel-tools 5.14.0-70.146.1.el9_0, python3-perf 5.14.0-70.146.1.el9_0, kernel-modules 5.14.0-70.146.1.el9_0, +19 more
    fixed: vendor fix RHSA-2025:15670
  • Red Hat Enterprise Linux BaseOS E4S (v.9.2) bpftool 7.0.0-284.137.1.el9_2, kernel 5.14.0-284.137.1.el9_2, kernel-64k 5.14.0-284.137.1.el9_2, kernel-core 5.14.0-284.137.1.el9_2, kernel-tools 5.14.0-284.137.1.el9_2, python3-perf 5.14.0-284.137.1.el9_2, +33 more
    fixed: vendor fix RHSA-2025:15669
  • 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, +33 more
    fixed: vendor fix RHSA-2025:15668
  • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) perf 4.18.0-305.172.1.el8_4, kernel 4.18.0-305.172.1.el8_4, bpftool 4.18.0-305.172.1.el8_4, kernel-core 4.18.0-305.172.1.el8_4, kernel-tools 4.18.0-305.172.1.el8_4, python3-perf 4.18.0-305.172.1.el8_4, +8 more
    fixed: vendor fix RHSA-2025:15660
  • Red Hat Enterprise Linux BaseOS TUS (v.8.6) perf 4.18.0-372.160.1.el8_6, kernel 4.18.0-372.160.1.el8_6, bpftool 4.18.0-372.160.1.el8_6, kernel-core 4.18.0-372.160.1.el8_6, kernel-tools 4.18.0-372.160.1.el8_6, python3-perf 4.18.0-372.160.1.el8_6, +8 more
    fixed: vendor fix RHSA-2025:15647
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libperf 5.14.0-570.42.2.el9_6, kernel-debuginfo-common-s390x 5.14.0-570.42.2.el9_6, kernel-debuginfo-common-x86_64 5.14.0-570.42.2.el9_6, kernel-debuginfo-common-aarch64 5.14.0-570.42.2.el9_6, kernel-debuginfo-common-ppc64le 5.14.0-570.42.2.el9_6
    fixed: vendor fix RHSA-2025:15661
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libperf 6.12.0-55.32.1.el10_0, kernel-debuginfo-common-s390x 6.12.0-55.32.1.el10_0, kernel-debuginfo-common-x86_64 6.12.0-55.32.1.el10_0, kernel-debuginfo-common-aarch64 6.12.0-55.32.1.el10_0, kernel-debuginfo-common-ppc64le 6.12.0-55.32.1.el10_0
    fixed: vendor fix RHSA-2025:15662
  • Red Hat Enterprise Linux CRB (v. 8) kernel-debuginfo-common-x86_64 4.18.0-553.74.1.el8_10, kernel-debuginfo-common-aarch64 4.18.0-553.74.1.el8_10, kernel-debuginfo-common-ppc64le 4.18.0-553.74.1.el8_10
    fixed: vendor fix RHSA-2025:15471
  • Red Hat Enterprise Linux for Real Time (v. 7 ELS) kernel-rt 3.10.0-1160.139.1.rt56.1291.el7, kernel-rt-trace 3.10.0-1160.139.1.rt56.1291.el7, kernel-rt-debuginfo-common-x86_64 3.10.0-1160.139.1.rt56.1291.el7
    fixed: vendor fix RHSA-2025:15646
  • Red Hat Enterprise Linux NFV (v. 8) kernel-rt 4.18.0-553.74.1.rt7.415.el8_10, kernel-rt-kvm 4.18.0-553.74.1.rt7.415.el8_10, kernel-rt-core 4.18.0-553.74.1.rt7.415.el8_10, kernel-rt-modules 4.18.0-553.74.1.rt7.415.el8_10, kernel-rt-debug-kvm 4.18.0-553.74.1.rt7.415.el8_10, kernel-rt-debug-core 4.18.0-553.74.1.rt7.415.el8_10, +4 more
    fixed: vendor fix RHSA-2025:15472
  • Red Hat Enterprise Linux NFV E4S (v.9.0) kernel-rt 5.14.0-70.146.1.rt21.218.el9_0, kernel-rt-kvm 5.14.0-70.146.1.rt21.218.el9_0, kernel-rt-core 5.14.0-70.146.1.rt21.218.el9_0, kernel-rt-modules 5.14.0-70.146.1.rt21.218.el9_0, kernel-rt-debug-kvm 5.14.0-70.146.1.rt21.218.el9_0, kernel-rt-debug-core 5.14.0-70.146.1.rt21.218.el9_0, +4 more
    fixed: vendor fix RHSA-2025:15658
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-570.42.2.el9_6, kernel-rt-64k 5.14.0-570.42.2.el9_6, kernel-rt-core 5.14.0-570.42.2.el9_6, kernel-rt-modules 5.14.0-570.42.2.el9_6, kernel-rt-64k-core 5.14.0-570.42.2.el9_6, kernel-rt-debug-core 5.14.0-570.42.2.el9_6, +14 more
    fixed: vendor fix RHSA-2025:15661
  • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt 6.12.0-55.32.1.el10_0, kernel-rt-64k 6.12.0-55.32.1.el10_0, kernel-rt-core 6.12.0-55.32.1.el10_0, kernel-rt-modules 6.12.0-55.32.1.el10_0, kernel-rt-64k-core 6.12.0-55.32.1.el10_0, kernel-rt-debug-core 6.12.0-55.32.1.el10_0, +14 more
    fixed: vendor fix RHSA-2025:15662
  • Red Hat Enterprise Linux Real Time E4S (v.9.0) kernel-rt 5.14.0-70.146.1.rt21.218.el9_0, kernel-rt-core 5.14.0-70.146.1.rt21.218.el9_0, kernel-rt-modules 5.14.0-70.146.1.rt21.218.el9_0, kernel-rt-debug-core 5.14.0-70.146.1.rt21.218.el9_0, kernel-rt-debug-modules 5.14.0-70.146.1.rt21.218.el9_0, kernel-rt-modules-extra 5.14.0-70.146.1.rt21.218.el9_0, +2 more
    fixed: vendor fix RHSA-2025:15658
  • Red Hat Enterprise Linux Real Time E4S (v.9.2) kernel-rt 5.14.0-284.137.1.rt14.422.el9_2, kernel-rt-core 5.14.0-284.137.1.rt14.422.el9_2, kernel-rt-modules 5.14.0-284.137.1.rt14.422.el9_2, kernel-rt-debug-core 5.14.0-284.137.1.rt14.422.el9_2, kernel-rt-modules-core 5.14.0-284.137.1.rt14.422.el9_2, kernel-rt-debug-modules 5.14.0-284.137.1.rt14.422.el9_2, +4 more
    fixed: vendor fix RHSA-2025:15657
  • 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 5.14.0-570.42.2.el9_6, kernel-rt-kvm 5.14.0-570.42.2.el9_6, kernel-rt-core 5.14.0-570.42.2.el9_6, kernel-rt-modules 5.14.0-570.42.2.el9_6, kernel-rt-debug-kvm 5.14.0-570.42.2.el9_6, kernel-rt-debug-core 5.14.0-570.42.2.el9_6, +6 more
    fixed: vendor fix RHSA-2025:15661
  • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt 6.12.0-55.32.1.el10_0, kernel-rt-kvm 6.12.0-55.32.1.el10_0, kernel-rt-core 6.12.0-55.32.1.el10_0, kernel-rt-modules 6.12.0-55.32.1.el10_0, kernel-rt-debug-kvm 6.12.0-55.32.1.el10_0, kernel-rt-debug-core 6.12.0-55.32.1.el10_0, +6 more
    fixed: vendor fix RHSA-2025:15662
  • Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2) kernel-rt 5.14.0-284.137.1.rt14.422.el9_2, kernel-rt-kvm 5.14.0-284.137.1.rt14.422.el9_2, kernel-rt-core 5.14.0-284.137.1.rt14.422.el9_2, kernel-rt-modules 5.14.0-284.137.1.rt14.422.el9_2, kernel-rt-debug-kvm 5.14.0-284.137.1.rt14.422.el9_2, kernel-rt-debug-core 5.14.0-284.137.1.rt14.422.el9_2, +6 more
    fixed: vendor fix RHSA-2025:15657
  • 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 4.18.0-553.74.1.rt7.415.el8_10, kernel-rt-core 4.18.0-553.74.1.rt7.415.el8_10, kernel-rt-modules 4.18.0-553.74.1.rt7.415.el8_10, kernel-rt-debug-core 4.18.0-553.74.1.rt7.415.el8_10, kernel-rt-debug-modules 4.18.0-553.74.1.rt7.415.el8_10, kernel-rt-modules-extra 4.18.0-553.74.1.rt7.415.el8_10, +2 more
    fixed: vendor fix RHSA-2025:15472
  • Red Hat Enterprise Linux Server (v. 7 ELS) perf 3.10.0-1160.139.1.el7, kernel 3.10.0-1160.139.1.el7, bpftool 3.10.0-1160.139.1.el7, python-perf 3.10.0-1160.139.1.el7, kernel-kdump 3.10.0-1160.139.1.el7, kernel-tools 3.10.0-1160.139.1.el7, +7 more Red Hat Enterprise Linux Server Optional (v. 7 ELS) kernel-debuginfo-common-ppc64 3.10.0-1160.139.1.el7, kernel-debuginfo-common-x86_64 3.10.0-1160.139.1.el7, kernel-debuginfo-common-ppc64le 3.10.0-1160.139.1.el7
    fixed: vendor fix RHSA-2025:15648
  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux AppStream (v. 9) kernel-doc 5.14.0-570.42.2.el9_6 Red Hat Enterprise Linux AppStream (v. 10) kernel-doc 6.12.0-55.32.1.el10_0
    not affected: vulnerable code not present

16 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

Timeline

  1. Published
  2. 0-day patched (Project Zero)
  3. Added to CISA KEV
  4. CISA SSVC: exploitation active
  5. CISA patch deadline

Known exploited

Added
14 mo ago
Patch by
2025-09-25 (13 mo ago)
Ransomware
Not known
Required action
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Vendor, product
Linux, Kernel
CISA name
Linux Kernel Time-of-Check Time-of-Use (TOCTOU) Race Condition Vulnerability

Zero-day

Detected in real attacks while still unknown to the vendor and the public, per Google Project Zero's 0day In-the-Wild tracker.

Patched
2025-09-01
Details
project zero tracker

CISA SSVC

Exploitation
Active, exploited in the wild
Automatable
no
Technical impact
total
Assessed
14 mo ago

Exploit prediction

1.36% chance of exploitation in the next 30 days, higher than 71% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/farazsth98/chronomaly referenced PoC, tagged "exploit" by a source, unverified

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

Affected products

  • Linux Linux

Classification

Weakness
  • CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition
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.