CVE-2025-39737

MEDIUM EPSS 5.5%
Published Sep 11, 20259mo ago · Modified Jun 17, 20261w ago
5.5 CVSS 3.1
Medium
Find Similar
Published Sep 11, 2025 9mo ago
Last Modified Jun 17, 2026 1w ago

Description

In the Linux kernel, the following vulnerability has been resolved: mm/kmemleak: avoid soft lockup in __kmemleak_do_cleanup() A soft lockup warning was observed on a relative small system x86-64 system with 16 GB of memory when running a debug kernel with kmemleak enabled. watchdog: BUG: soft lockup - CPU#8 stuck for 33s! [kworker/8:1:134] The test system was running a workload with hot unplug happening in parallel. Then kemleak decided to disable itself due to its inability to allocate more kmemleak objects. The debug kernel has its CONFIG_DEBUG_KMEMLEAK_MEM_POOL_SIZE set to 40,000. The soft lockup happened in kmemleak_do_cleanup() when the existing kmemleak objects were being removed and deleted one-by-one in a loop via a workqueue. In this particular case, there are at least 40,000 objects that need to be processed and given the slowness of a debug kernel and the fact that a raw_spinlock has to be acquired and released in __delete_object(), it could take a while to properly handle all these objects. As kmemleak has been disabled in this case, the object removal and deletion process can be further optimized as locking isn't really needed. However, it is probably not worth the effort to optimize for such an edge case that should rarely happen. So the simple solution is to call cond_resched() at periodic interval in the iteration loop to avoid soft lockup.

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
5.5% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-401

Affected Products 16

VendorProductVersionRange
linuxlinux_kernel*≥5.4.1  –  <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_kernel5.4any
linuxlinux_kernel5.4any
linuxlinux_kernel5.4any
linuxlinux_kernel5.4any
linuxlinux_kernel5.4any
linuxlinux_kernel5.4any
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/1ef72a7fedc5bca70e8cc980985790de10d407aa
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/8d2d22a55ffe35c38e69795468a7addd1a80e9ce
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/926092268efdf1ed7b55cf486356c74a9e7710d1
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/9b80430c194e4a114dc663c1025d56b4f3d0153d
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/9f1f4e95031f84867c5821540466d62f88dab8ca
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a04de4c40aab9b338dfa989cf4aec70fd187eeb2
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/d1534ae23c2b6be350c8ab060803fbf6e9682adc
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/e21a3ddd58733ce31afcb1e5dc3cb80a4b5bc29b
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/f014c10d190b92aad366e56b445daffcd1c075e4
    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/1ef72a7fedc5bca70e8cc980985790de10d407aa
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/8d2d22a55ffe35c38e69795468a7addd1a80e9ce
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/926092268efdf1ed7b55cf486356c74a9e7710d1
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/9b80430c194e4a114dc663c1025d56b4f3d0153d
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/9f1f4e95031f84867c5821540466d62f88dab8ca
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a04de4c40aab9b338dfa989cf4aec70fd187eeb2
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/d1534ae23c2b6be350c8ab060803fbf6e9682adc
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/e21a3ddd58733ce31afcb1e5dc3cb80a4b5bc29b
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/f014c10d190b92aad366e56b445daffcd1c075e4
    Patch