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CVE-2025-38352— posix-cpu-timers: fix race between handle_posix_cpu_timers() and posix_cpu_timer_del()

Quick assessment

Affected
Linux Linux
Exploitation
Confirmed exploitation in the wild; remediate immediately
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于posix-cpu-timers和posix_cpu_timer_del之间存在竞争条件，可能导致任务被错误回收。

CVSS 7.8 · High KEV EPSS 1.34% · P71

Possible ATT&CK Techniques 1 AI

T1564.004 · NTFS File Attributes

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 0bdd2ed4138ec04e09b4f8165981efc99e439f55< 78a4b8e3795b31dae58762bc091bb0f4f74a2200 affected
0bdd2ed4138ec04e09b4f8165981efc99e439f55< c076635b3a42771ace7d276de8dc3bc76ee2ba1b affected
0bdd2ed4138ec04e09b4f8165981efc99e439f55< 2f3daa04a9328220de46f0d5c919a6c0073a9f0b affected
0bdd2ed4138ec04e09b4f8165981efc99e439f55< 764a7a5dfda23f69919441f2eac2a83e7db6e5bb affected
0bdd2ed4138ec04e09b4f8165981efc99e439f55< 2c72fe18cc5f9f1750f5bc148cf1c94c29e106ff affected
0bdd2ed4138ec04e09b4f8165981efc99e439f55< c29d5318708e67ac13c1b6fc1007d179fb65b4d7 affected
0bdd2ed4138ec04e09b4f8165981efc99e439f55< 460188bc042a3f40f72d34b9f7fc6ee66b0b757b affected
0bdd2ed4138ec04e09b4f8165981efc99e439f55< f90fff1e152dedf52b932240ebbd670d83330eca affected
… +10 more rows
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I. Basic Information for CVE-2025-38352

Vulnerability Information
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Vulnerability Title
posix-cpu-timers: fix race between handle_posix_cpu_timers() and posix_cpu_timer_del()
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于posix-cpu-timers和posix_cpu_timer_del之间存在竞争条件，可能导致任务被错误回收。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 0bdd2ed4138ec04e09b4f8165981efc99e439f55 ~ 78a4b8e3795b31dae58762bc091bb0f4f74a2200 -
Linux Linux 2.6.36 -

II. Public POCs for CVE-2025-38352

# POC Description Source Link Shenlong Link
1 This is a proof of concept for CVE-2025-38352, a vulnerability in the Linux kernel's POSIX CPU timers implementation. The September 2025 Android Bulletin mentions that this vulnerability has been used in limited, targeted exploitation in the wild. https://github.com/farazsth98/poc-CVE-2025-38352 POC Details
2 Android kernel exploit for CVE-2025-38352, previously exploited in-the-wild. Targets vulnerable Linux kernels v5.10.x. https://github.com/farazsth98/chronomaly POC Details
3 None https://github.com/Crime2/poc-CVE-2025-38352 POC Details
4 🛠️ Exploit the CVE-2025-38352 vulnerability in the Android/Linux kernel with Chronomaly, designed for efficient use on vulnerable v5.10.x kernels. https://github.com/Soikoth3010/chronomaly POC Details
5 🚀 Exploit the Android/Linux kernel using CVE-2025-38352 with Chronomaly, designed for vulnerable v5.10.x kernels without needing specific offsets. https://github.com/Soikoth3010/soikoth3010.github.io POC Details
6 The official Sentinel Edition v7.11 - Hypervisor Detection & Kernel Memory Audit Suite for Honor Magic V2. Investigating CVE-2025-38352 and EL2 RKP defenses. https://github.com/jordelmir/Elysium-Vanguard-Sentinel-Audit POC Details
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default-local-qwen3.6 · 11421 chars
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III. Intelligence Information for CVE-2025-38352

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Patches & Fixes for CVE-2025-38352 (2)

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-38352

Anonymous User
2026-01-15 06:09:53

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