CVE-2025-39736

MEDIUM EPSS 2.2%
Published Sep 11, 20259mo ago · Modified Jun 17, 20262w ago
5.5 CVSS 3.1
Medium
Find Similar
Published Sep 11, 2025 9mo ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
2.2% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-667

Affected Products 10

VendorProductVersionRange
linuxlinux_kernel*≥5.4  –  <5.4.297
linuxlinux_kernel*≥5.5  –  <5.10.241
linuxlinux_kernel*≥5.11  –  <5.15.190
linuxlinux_kernel*≥5.16  –  <6.1.149
linuxlinux_kernel*≥6.2  –  <6.6.103
linuxlinux_kernel*≥6.7  –  <6.12.43
linuxlinux_kernel*≥6.13  –  <6.15.11
linuxlinux_kernel*≥6.16  –  <6.16.2
linuxlinux_kernel6.17any
debiandebian_linux11.0any

References 12

  • cert-portal.siemens.com https://cert-portal.siemens.com/productcert/html/ssa-032379.html
  • git.kernel.org https://git.kernel.org/stable/c/08f70be5e406ce47c822f2dd11c1170ca259605b
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/1da95d3d4b7b1d380ebd87b71a61e7e6aed3265d
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/47b0f6d8f0d2be4d311a49e13d2fd5f152f492b2
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/4b0151e1d468eb2667c37b7af99b3c075072d334
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/62879faa8efe8d8a9c7bf7606ee9c068012d7dac
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a0854de00ce2ee27edf39037e7836ad580eb3350
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a181b228b37a6a5625dad2bb4265bb7abb673e9f
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c7b6ea0ede687e7460e593c5ea478f50aa41682a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/f249d32bb54876b4b6c3ae071af8ddca77af390b
    Patch
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html
    Mailing ListThird Party Advisory
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
    Mailing ListThird Party Advisory

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/08f70be5e406ce47c822f2dd11c1170ca259605b
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/1da95d3d4b7b1d380ebd87b71a61e7e6aed3265d
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/47b0f6d8f0d2be4d311a49e13d2fd5f152f492b2
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/4b0151e1d468eb2667c37b7af99b3c075072d334
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/62879faa8efe8d8a9c7bf7606ee9c068012d7dac
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a0854de00ce2ee27edf39037e7836ad580eb3350
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a181b228b37a6a5625dad2bb4265bb7abb673e9f
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c7b6ea0ede687e7460e593c5ea478f50aa41682a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/f249d32bb54876b4b6c3ae071af8ddca77af390b
    Patch