CVE-2025-38352posix-cpu-timers: fix race between handle_posix_cpu_timers() and posix_cpu_timer_del()
Updated under an hour ago ()
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It affects Linux and 2 other products. Add what you run to find out whether that includes you.
CISA lists it as known exploited since Sep 4, 2025; federal agencies had to remediate by Sep 25, 2025. Treat that date as your deadline.
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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.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-367
- Known exploited
- Added to CISA KEV Sep 4, 2025; federal remediation due Sep 25, 2025Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- EPSS (exploitation in the next 30 days)
- 1.34% (percentile 71)
- Assigned by
- Linux
- NVD analysis
- Analyzed
- Record last updated
- Sep 8, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 0bdd2ed4138ec04e09b4f8165981efc99e439f55 before 78a4b8e3795b31dae58762bc091bb0f4f74a2200; from 0bdd2ed4138ec04e09b4f8165981efc99e439f55 before c076635b3a42771ace7d276de8dc3bc76ee2ba1b; from 0bdd2ed4138ec04e09b4f8165981efc99e439f55 before 2f3daa04a9328220de46f0d5c919a6c0073a9f0b; from 0bdd2ed4138ec04e09b4f8165981efc99e439f55 before 764a7a5dfda23f69919441f2eac2a83e7db6e5bb; from 0bdd2ed4138ec04e09b4f8165981efc99e439f55 before 2c72fe18cc5f9f1750f5bc148cf1c94c29e106ff; from 0bdd2ed4138ec04e09b4f8165981efc99e439f55 before c29d5318708e67ac13c1b6fc1007d179fb65b4d7; from 0bdd2ed4138ec04e09b4f8165981efc99e439f55 before 460188bc042a3f40f72d34b9f7fc6ee66b0b757b; from 0bdd2ed4138ec04e09b4f8165981efc99e439f55 before f90fff1e152dedf52b932240ebbd670d83330eca | CNA record |
linux linux_kernel linux:linux_kernel | from 2.6.36 before 5.4.295; from 5.5 before 5.10.239; from 5.11 before 5.15.186; from 5.16 before 6.1.142; from 6.2 before 6.6.94; from 6.7 before 6.12.34; from 6.13 before 6.15.3; 6.16 | NVD |
debian debian_linux debian:debian_linux | 11.0 | NVD |
References
- https://git.kernel.org/stable/c/78a4b8e3795b31dae58762bc091bb0f4f74a2200patch
- https://git.kernel.org/stable/c/c076635b3a42771ace7d276de8dc3bc76ee2ba1bpatch
- https://git.kernel.org/stable/c/2f3daa04a9328220de46f0d5c919a6c0073a9f0bpatch
- https://git.kernel.org/stable/c/764a7a5dfda23f69919441f2eac2a83e7db6e5bbpatch
- https://git.kernel.org/stable/c/2c72fe18cc5f9f1750f5bc148cf1c94c29e106ffpatch
- https://git.kernel.org/stable/c/c29d5318708e67ac13c1b6fc1007d179fb65b4d7patch
- https://git.kernel.org/stable/c/460188bc042a3f40f72d34b9f7fc6ee66b0b757bpatch
- https://git.kernel.org/stable/c/f90fff1e152dedf52b932240ebbd670d83330ecapatch
- https://lists.debian.org/debian-lts-announce/2025/10/msg00007.htmlmailing-list, third-party-advisory
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.htmlmailing-list, third-party-advisory
- https://github.com/farazsth98/chronomalyexploit
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-38352us-government-resource
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.