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CVE-2025-38352

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

Exploited in the wild. In CISA KEV since 2025‑09‑04. Fixed versions are out.

CVSS 3.17.8HighEPSS percentile71st1.3% chance in 30 daysCISA KEVListedsince 2025-09-04, due 2025-09-25
Public exploit: 1 sourceFix5 products4 fixed builds listed below

Published Updated Sources: CVE.org, NVD, BDU

NVD CVE.org

What to do

Find your product and version, then upgrade to the build on the right.

  • LinuxAffected: ≥ 0bdd2ed4138ec04e09b4f8165981efc99e439f55, < 78a4b8e3795b31dae58762bc091bb0f4f74a2200Upgrade to: 78a4b8e3795b31dae58762bc091bb0f4f74a2200Affected: ≥ 0bdd2ed4138ec04e09b4f8165981efc99e439f55, < c076635b3a42771ace7d276de8dc3bc76ee2ba1bUpgrade to: c076635b3a42771ace7d276de8dc3bc76ee2ba1bAffected: ≥ 0bdd2ed4138ec04e09b4f8165981efc99e439f55, < 2f3daa04a9328220de46f0d5c919a6c0073a9f0bUpgrade to: 2f3daa04a9328220de46f0d5c919a6c0073a9f0bAffected: ≥ 0bdd2ed4138ec04e09b4f8165981efc99e439f55, < 764a7a5dfda23f69919441f2eac2a83e7db6e5bbUpgrade to: 764a7a5dfda23f69919441f2eac2a83e7db6e5bb + 4 more branchesStated by: CVE record
  • ООО «Ред Софт» РЕД ОСAffected: 7.3Upgrade to: not statedStated by: BDU
  • ООО «РусБИТех-Астра» Astra Linux Special EditionAffected: 1.7Upgrade to: not statedStated by: BDU
  • Сообщество свободного программного обеспечения LinuxAffected: от 5.10 до 5.10.239Upgrade to: not statedStated by: BDU
  • АО «НППКТ» ОСОН ОСнова ОnyxAffected: до 2.14Upgrade to: not statedStated by: BDU

Versions as the sources state them. 1 more product has version data. Full version matrix after sign-in

Check it yourselfA free OpenVAS check exists for this CVE. Run it against your hosts.Is your organisation exposed?Request an assessment to establish which checks fit your systems.

Coverage timeline

0 publishers

  1. Added to CISA KEV catalog

    ·CISA KEV

Sourced from public security reporting — each date is when it was published, not when it happened. 1 further article named this CVE in wider roundups without reporting it as a distinct event.

What it is

From the CVE record

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.

In plain language

No plain-language summary for this CVE yet.

Exploitation

Where each signal puts this CVE on the scale from published to confirmed exploited.

EPSS71st
Public exploit
CISA KEV
CISA KEV

Listed as exploited in the wild since 2025-09-04.

US federal agencies must remediate by 2025-09-25.

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

1 source with a proof of concept or module.

Exploit links, PoCs and Metasploit modules after sign-in
EPSS

1.3% chance of exploitation activity in the next 30 days, which ranks it in the 71st percentile of scored CVEs.

Exploit Prediction Scoring System, FIRST.org. A probability, not a confirmation.

Attention now

Rising.

Lifecycle

The patch came 57 days before any public exploit.

  1. Patch availablerecord updated
  2. Patch availablepatch available, record updated, record updated
  3. OpenVAS check added
  4. Public exploit / PoCsource: github-poc
  5. Patch availablerecord updated
  6. Added to CISA KEV

Affected products

And 3 more affected products. See all after sign-in

Technical detail

CVSS 3.1 vector

Open in the CVSS calculator

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

Scored 7.8 by NVD.

How it is reached

  • Attack Vector LocalRequires local access to the vulnerable system (e.g. local login, malicious file)
  • Attack Complexity LowNo special conditions — the attack can be reliably reproduced
  • Privileges Required LowRequires basic user-level privileges
  • User Interaction NoneNo user interaction needed — fully automated exploitation

Scope

  • Scope UnchangedImpact is limited to the vulnerable component itself

Impact if exploited

  • Confidentiality HighTotal information disclosure — all data in the component is compromised
  • Integrity HighTotal loss of integrity — attacker can modify any data in the component
  • Availability HighTotal denial of service — the component is completely unavailable

Weaknesses

ATT&CK techniques

Mapped from the weaknesses above (CWE to ATT&CK), not observed in attacks.

Sources

References in the record

And 19 more references. See all after sign-in

In the news

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