CVE-2025-38352

Advisory lineage Upstream: 0 Downstream: 135
Analyzed
Published: 22 Jul 2025, 08:04
Last modified:11 May 2026, 21:26

Vulnerability Summary

Overall Risk (default)
medium
40/100
CVSS Score
7.4 HIGH
v3.1 (cve.org)
EPSS Score
0.14% LOW
0% probability +0.09%
KEV
Listed
CISA
1 listing
Ransomware
No reports
Public exploits
1 found
Dark Web
Not detected

Timeline

22 Jul 2025, 08:04
Published
Vulnerability first disclosed
04 Sept 2025, 00:00
Added to CISA KEV
Linux Kernel Time-of-Check Time-of-Use (TOCTOU) Race Condition Vulnerability
25 Sept 2025, 00:00
CISA Remediation Due
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
11 May 2026, 21:26
Last Modified
Vulnerability information updated

Description

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 Metrics

  • v3.1•HIGH•Score: 7.4CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Trends

Current EPSS score: 0.14%• Percentile: 33%

Techniques & Countermeasures

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

    The product checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check.

Affected Systems

  • debian•debian_linux

    11.0

  • linux•linux

    ≥ 0bdd2ed4138ec04e09b4f8165981efc99e439f55, < 78a4b8e3795b31dae58762bc091bb0f4f74a2200 | ≥ 0bdd2ed4138ec04e09b4f8165981efc99e439f55, < c076635b3a42771ace7d276de8dc3bc76ee2ba1b | ≥ 0bdd2ed4138ec04e09b4f8165981efc99e439f55, < 2f3daa04a9328220de46f0d5c919a6c0073a9f0b | ≥ 0bdd2ed4138ec04e09b4f8165981efc99e439f55, < 764a7a5dfda23f69919441f2eac2a83e7db6e5bb | ≥ 0bdd2ed4138ec04e09b4f8165981efc99e439f55, < 2c72fe18cc5f9f1750f5bc148cf1c94c29e106ff | ≥ 0bdd2ed4138ec04e09b4f8165981efc99e439f55, < c29d5318708e67ac13c1b6fc1007d179fb65b4d7 | ≥ 0bdd2ed4138ec04e09b4f8165981efc99e439f55, < 460188bc042a3f40f72d34b9f7fc6ee66b0b757b | ≥ 0bdd2ed4138ec04e09b4f8165981efc99e439f55, < f90fff1e152dedf52b932240ebbd670d83330eca | 2.6.36

  • linux•linux_kernel

    ≥ 2.6.36, < 5.4.295 | ≥ 5.5, < 5.10.239 | ≥ 5.11, < 5.15.186 | ≥ 5.16, < 6.1.142 | ≥ 6.2, < 6.6.94 | ≥ 6.7, < 6.12.34 | ≥ 6.13, < 6.15.3 | 6.16:rc1

References (12)