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CVE-2025-38352

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

CVSS 3.1 High 7.8Known exploited (CISA KEV)

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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.

Official description from the CVE record, published by Linux. Copyright © 1999-2026 The MITRE Corporation. See /security/cve/legal for the CVE license. View the record on cve.org

Key data

CVSS 3.1 High 7.8

Score published by Linux in the CVE record.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

  • Attack vector: Local

    The attacker needs local access to the system, or to trick a user into running something.

  • Attack complexity: Low

    No special conditions are needed. The attack can be repeated at will.

  • Privileges required: Low

    A basic user account is needed.

  • User interaction: None

    No action from any user is needed.

  • Scope: Unchanged

    The impact stays within the vulnerable component.

  • Confidentiality impact: High

    Serious or total effect on the secrecy of data.

  • Integrity impact: High

    Serious or total effect on the trustworthiness of data.

  • Availability impact: High

    Serious or total effect on availability.

CVSS is owned and managed by FIRST.Org, Inc. (FIRST) and is used by permission. Each CVSS score on this site is shown together with its vector string, as published in the CVE record by the source named next to it. Learn more at first.org/cvss.

EPSS

Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days.
Score
0.01357 (1.4% probability)
Percentile
71.9%
Scores of
Nov 10, 2026
Model
v2026.06.15

CISA Known Exploited Vulnerabilities

This CVE is listed in the CISA KEV catalog.
Name in the catalog
Linux Kernel Time-of-Check Time-of-Use (TOCTOU) Race Condition Vulnerability
Added to the catalog
Sep 4, 2025
Federal due date
Sep 25, 2025

CISA assessment as of Sep 5, 2025

Stakeholder-Specific Vulnerability Categorization (SSVC) decision points added by CISA.
Exploitation
Recorded by CISA as active
Automatable
no
Technical impact
total

Weakness (CWE)

CWE catalog version 5.0.
CWE names: Copyright © 2006-2026, The MITRE Corporation. See /security/cve/legal for the CWE license.
  • CWE-367Time-of-check Time-of-use (TOCTOU) Race Condition

Affected products

Products listed in the CVE record, as the CNA published them.

  • Linux

    • affected: 0bdd2ed4138ec04e09b4f8165981efc99e439f55 up to before 78a4b8e3795b31dae58762bc091bb0f4f74a2200
    • affected: 0bdd2ed4138ec04e09b4f8165981efc99e439f55 up to before c076635b3a42771ace7d276de8dc3bc76ee2ba1b
    • affected: 0bdd2ed4138ec04e09b4f8165981efc99e439f55 up to before 2f3daa04a9328220de46f0d5c919a6c0073a9f0b
    • affected: 0bdd2ed4138ec04e09b4f8165981efc99e439f55 up to before 764a7a5dfda23f69919441f2eac2a83e7db6e5bb
    • affected: 0bdd2ed4138ec04e09b4f8165981efc99e439f55 up to before 2c72fe18cc5f9f1750f5bc148cf1c94c29e106ff
    • affected: 0bdd2ed4138ec04e09b4f8165981efc99e439f55 up to before c29d5318708e67ac13c1b6fc1007d179fb65b4d7
    • affected: 0bdd2ed4138ec04e09b4f8165981efc99e439f55 up to before 460188bc042a3f40f72d34b9f7fc6ee66b0b757b
    • affected: 0bdd2ed4138ec04e09b4f8165981efc99e439f55 up to before f90fff1e152dedf52b932240ebbd670d83330eca

  • Linux

    • affected: 2.6.36
    • unaffected: before 2.6.36
    • unaffected: 5.4.295 up to 5.4.*
    • unaffected: 5.10.239 up to 5.10.*
    • unaffected: 5.15.186 up to 5.15.*
    • unaffected: 6.1.142 up to 6.1.*
    • unaffected: 6.6.94 up to 6.6.*
    • unaffected: 6.12.34 up to 6.12.*
    • unaffected: 6.15.3 up to 6.15.*
    • unaffected: 6.16 up to *

References

Links listed in the CVE record. They lead to other sites, which CubePath does not control.

Timeline

  1. ID reserved
  2. Record published
  3. Added to CISA KEV
  4. Record last updated

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Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 19:49 UTC. Sources and licenses