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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2025-39736 Detail

Description

In the Linux kernel, the following vulnerability has been resolved: mm/kmemleak: avoid deadlock by moving pr_warn() outside kmemleak_lock When netpoll is enabled, calling pr_warn_once() while holding kmemleak_lock in mem_pool_alloc() can cause a deadlock due to lock inversion with the netconsole subsystem. This occurs because pr_warn_once() may trigger netpoll, which eventually leads to __alloc_skb() and back into kmemleak code, attempting to reacquire kmemleak_lock. This is the path for the deadlock. mem_pool_alloc() -> raw_spin_lock_irqsave(&kmemleak_lock, flags); -> pr_warn_once() -> netconsole subsystem -> netpoll -> __alloc_skb -> __create_object -> raw_spin_lock_irqsave(&kmemleak_lock, flags); Fix this by setting a flag and issuing the pr_warn_once() after kmemleak_lock is released.


Metrics

 
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CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
https://cert-portal.siemens.com/productcert/html/ssa-032379.html siemens-SADP
https://git.kernel.org/stable/c/08f70be5e406ce47c822f2dd11c1170ca259605b kernel.org Patch 
https://git.kernel.org/stable/c/1da95d3d4b7b1d380ebd87b71a61e7e6aed3265d kernel.org Patch 
https://git.kernel.org/stable/c/47b0f6d8f0d2be4d311a49e13d2fd5f152f492b2 kernel.org Patch 
https://git.kernel.org/stable/c/4b0151e1d468eb2667c37b7af99b3c075072d334 kernel.org Patch 
https://git.kernel.org/stable/c/62879faa8efe8d8a9c7bf7606ee9c068012d7dac kernel.org Patch 
https://git.kernel.org/stable/c/a0854de00ce2ee27edf39037e7836ad580eb3350 kernel.org Patch 
https://git.kernel.org/stable/c/a181b228b37a6a5625dad2bb4265bb7abb673e9f kernel.org Patch 
https://git.kernel.org/stable/c/c7b6ea0ede687e7460e593c5ea478f50aa41682a kernel.org Patch 
https://git.kernel.org/stable/c/f249d32bb54876b4b6c3ae071af8ddca77af390b kernel.org Patch 
https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html CVE Mailing List  Third Party Advisory 
https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html CVE Mailing List  Third Party Advisory 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-667 Improper Locking cwe source acceptance level NIST  

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Change History

4 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2025-39736
NVD Published Date:
09/11/2025
NVD Last Modified:
05/12/2026
Source:
kernel.org