CVE-2025-39736 | Teknoloji dünyasından en güncel haberleri ve güvenlikle ilgili gelişmeleri takip edin.

In the Linux kernel, the following vulnerability has been resolved: mm/kmemleak: avoid deadlock by moving pr_warn() outside kmemleak_lock When netpoll is enab…
Medium CVSS: 5.5

CVE-2025-39736

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.
Vendor
Linux
Product
Linux Kernel
CWE
CWE-667
Yayın Tarihi
2025-09-11 17:15:34
Güncelleme
2026-01-09 14:59:11
Source Identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
KEV Date Added
-

Kategoriler

CWE-667 Linux Kernel MEDIUM Linux 2025

Referanslar

https://git.kernel.org/stable/c/08f70be5e406ce47c822f2dd11c1170ca259605b https://git.kernel.org/stable/c/1da95d3d4b7b1d380ebd87b71a61e7e6aed3265d https://git.kernel.org/stable/c/47b0f6d8f0d2be4d311a49e13d2fd5f152f492b2 https://git.kernel.org/stable/c/4b0151e1d468eb2667c37b7af99b3c075072d334 https://git.kernel.org/stable/c/62879faa8efe8d8a9c7bf7606ee9c068012d7dac https://git.kernel.org/stable/c/a0854de00ce2ee27edf39037e7836ad580eb3350 https://git.kernel.org/stable/c/a181b228b37a6a5625dad2bb4265bb7abb673e9f https://git.kernel.org/stable/c/c7b6ea0ede687e7460e593c5ea478f50aa41682a https://git.kernel.org/stable/c/f249d32bb54876b4b6c3ae071af8ddca77af390b https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html