CVE-2025-38352

7.4

HIGH CVSS 3.1

Linux Kernel Time-of-Check Time-of-Use (TOCTOU) Race Condition Vulnerability - [Actively Exploited]

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.

INFO

Published Date :

July 22, 2025, 8:15 a.m.

Last Modified :

Sept. 5, 2025, 2:18 p.m.

Remotely Exploit :

No

Source :

416baaa9-dc9f-4396-8d5f-8c081fb06d67

CISA Notification

CISA KEV (Known Exploited Vulnerabilities)

For the benefit of the cybersecurity community and network defenders—and to help every organization better manage vulnerabilities and keep pace with threat activity—CISA maintains the authoritative source of vulnerabilities that have been exploited in the wild.

Due Date: Sep 25, 2025

Alert Date: Sep 04, 2025 | 46 days ago

Description :

Linux kernel contains a time-of-check time-of-use (TOCTOU) race condition vulnerability that has a high impact on confidentiality, integrity, and availability.

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.

Notes :

This vulnerability affects a common open-source component, third-party library, or a protocol used by different products. Please check with specific vendors for information on patching status. For more information, please see: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=2c72fe18cc5f9f1750f5bc148cf1c94c29e106ff ; https://source.android.com/docs/security/bulletin/2025-09-01 ; https://nvd.nist.gov/vuln/detail/CVE-2025-38352

Affected Products

The following products are affected by CVE-2025-38352 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID	Vendor	Product	Action
1	Linux	linux_kernel

: Total Affected Vendor : 1 | Products : 1

CVSS Scores

The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.

Score	Version	Severity	Vector	Exploitability Score	Impact Score	Source
	CVSS 3.1	HIGH				134c704f-9b21-4f2e-91b3-4a467353bcc0

Solution

Update the Linux kernel to resolve a race condition in POSIX CPU timers.

Update the Linux kernel to the latest version.
Apply the provided patch for the POSIX CPU timers.
Ensure CONFIG_POSIX_CPU_TIMERS_TASK_WORK is handled correctly.

Public PoC/Exploit Available at Github

CVE-2025-38352 has a 2 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2025-38352.

URL	Resource
https://git.kernel.org/stable/c/2c72fe18cc5f9f1750f5bc148cf1c94c29e106ff	Patch
https://git.kernel.org/stable/c/2f3daa04a9328220de46f0d5c919a6c0073a9f0b	Patch
https://git.kernel.org/stable/c/460188bc042a3f40f72d34b9f7fc6ee66b0b757b	Patch
https://git.kernel.org/stable/c/764a7a5dfda23f69919441f2eac2a83e7db6e5bb	Patch
https://git.kernel.org/stable/c/78a4b8e3795b31dae58762bc091bb0f4f74a2200	Patch
https://git.kernel.org/stable/c/c076635b3a42771ace7d276de8dc3bc76ee2ba1b	Patch
https://git.kernel.org/stable/c/c29d5318708e67ac13c1b6fc1007d179fb65b4d7	Patch
https://git.kernel.org/stable/c/f90fff1e152dedf52b932240ebbd670d83330eca	Patch

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2025-38352 is associated with the following CWEs:

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

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2025-38352 weaknesses.

CAPEC-27: Leveraging Race Conditions via Symbolic Links Leveraging Race Conditions via Symbolic Links CAPEC-29: Leveraging Time-of-Check and Time-of-Use (TOCTOU) Race Conditions Leveraging Time-of-Check and Time-of-Use (TOCTOU) Race Conditions

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

w4zu/Debian_security

DSA and DLA for Debian last 14 days

Python

Updated: 15 hours, 30 minutes ago

0 stars 0 fork 0 watcher

Born at : Feb. 12, 2025, 2:08 p.m. This repo has been linked 562 different CVEs too.

ARGOeu-Metrics/secmon-probes

None

Makefile Shell C Perl Python

Updated: 3 weeks, 2 days ago

1 stars 4 fork 4 watcher

Born at : June 9, 2016, 1:07 p.m. This repo has been linked 17 different CVEs too.

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2025-38352 vulnerability anywhere in the article.

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