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Known exploited vulnerability

CVE-2025-38352

highCVSS 3.1 7.8In CISA KEVEPSS 1.4%Published · Linux

The short answer

CVE-2025-38352 affects Linux Linux and is rated high (CVSS 7.8). CISA added it to the Known Exploited Vulnerabilities catalog on 2025-09-04: attackers are using it, so patch it first. The vendor has linked a patch.

What it is

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.

Weakness: CWE-367.

Severity

7.8 high

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

Exploited (CISA KEV)

Yes, since Sep 4, 2025

Federal due date Sep 25, 2025

EPSS, next 30 days

1.4%

Higher than 72% of scored CVEs

How it can be exploited

Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

What CISA says to do

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

Affected products

Linux. NVD's record lists the exact affected versions.

References

Questions

Is CVE-2025-38352 being exploited?

Yes. CISA added CVE-2025-38352 to its Known Exploited Vulnerabilities catalog on 2025-09-04, with a federal remediation due date of 2025-09-25.

How do I fix CVE-2025-38352?

CISA's 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.

From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.

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