CVE-2025-38352

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National Vulnerability Database Information

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.

CVSS Base Score: 7.4 (v3.1)

The **CVSS Base Score** is a score from **0 to 10** that represents the intrinsic severity of a vulnerability. A higher score indicates greater severity.

Value

0.02.55.07.510.0

Published on: 07/22/2025 08:15:23
Last modified: 01/08/2026 16:28:23
NIST: CVE source from the National Vulnerability Database (NVD)

CVSS Metrics Details

Base Severity: HIGH
Vector String: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector: LOCAL
Attack Complexity: HIGH
Privileges Required: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality Impact: HIGH
Integrity Impact: HIGH
Availability Impact: HIGH

Common Weakness Enumeration (CWE)

Database CWE: v4.18

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

The product checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check.

Fonte: MITRE CWE

FIRST Information

EPSS Score: 0.0008

The **EPSS (Exploit Prediction Scoring System)** is a score from **0 to 1** that indicates the **probability** that a vulnerability will be exploited in the real world in the next 30 days. A higher value indicates a greater likelihood of exploitation.

Value

0.00.250.50.751.0

Percentile: 0.2268

The **Percentile** indicates how much higher this vulnerability's EPSS score is compared to all other vulnerabilities in the EPSS database. For example, a percentile of 0.90 (90%) means that 90% of vulnerabilities have an EPSS score equal to or lower than the current one.

Value

0.00.250.50.751.0

*Data updated as of: 2026-02-07

CISA Information (Known Exploited Vulnerabilities)

The **CISA KEV Catalog** lists vulnerabilities that have been **actively exploited in the real world**. If a CVE is present in this catalog, it indicates that the threat is immediate and mitigation should be a top priority.

CVE **CVE-2025-38352** **IS PRESENT** in the CISA KEV Catalog!

Vulnerability Name: Linux Kernel Time-of-Check Time-of-Use (TOCTOU) Race Condition Vulnerability
Short 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.
Date Added to KEV: 09/04/2025
Vendor/Product: Linux / Kernel
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.
Due Date: 09/25/2025

Articles published on Red Hot Cyber

NVD References

Exploit PoC from GitHub

farazsth98/poc-CVE-2025-38352: 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.
farazsth98/chronomaly: Android kernel exploit for CVE-2025-38352, previously exploited in-the-wild. Targets vulnerable x86_64 Linux kernels v5.10.x.
Crime2/poc-CVE-2025-38352:
Soikoth3010/soikoth3010.github.io: 🚀 Exploit the Android/Linux kernel using CVE-2025-38352 with Chronomaly, designed for vulnerable v5.10.x kernels without needing specific offsets.
Soikoth3010/chronomaly: 🛠️ Exploit the CVE-2025-38352 vulnerability in the Android/Linux kernel with Chronomaly, designed for efficient use on vulnerable v5.10.x kernels.