mm/kmemleak: avoid soft lockup in __kmemleak_do_cleanup()

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Summary

CVECVE-2025-39737
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-09-11 17:15:35 UTC
Updated2026-05-12 13:17:08 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Problem Types: CWE-401

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 2abd839aa7e615f2bbc50c8ba7deb9e40d186768 9f1f4e95031f84867c5821540466d62f88dab8ca git Not specified
CNA Linux Linux affected 2abd839aa7e615f2bbc50c8ba7deb9e40d186768 1ef72a7fedc5bca70e8cc980985790de10d407aa git Not specified
CNA Linux Linux affected 2abd839aa7e615f2bbc50c8ba7deb9e40d186768 a04de4c40aab9b338dfa989cf4aec70fd187eeb2 git Not specified
CNA Linux Linux affected 2abd839aa7e615f2bbc50c8ba7deb9e40d186768 f014c10d190b92aad366e56b445daffcd1c075e4 git Not specified
CNA Linux Linux affected 2abd839aa7e615f2bbc50c8ba7deb9e40d186768 e21a3ddd58733ce31afcb1e5dc3cb80a4b5bc29b git Not specified
CNA Linux Linux affected 2abd839aa7e615f2bbc50c8ba7deb9e40d186768 8d2d22a55ffe35c38e69795468a7addd1a80e9ce git Not specified
CNA Linux Linux affected 2abd839aa7e615f2bbc50c8ba7deb9e40d186768 926092268efdf1ed7b55cf486356c74a9e7710d1 git Not specified
CNA Linux Linux affected 2abd839aa7e615f2bbc50c8ba7deb9e40d186768 9b80430c194e4a114dc663c1025d56b4f3d0153d git Not specified
CNA Linux Linux affected 2abd839aa7e615f2bbc50c8ba7deb9e40d186768 d1534ae23c2b6be350c8ab060803fbf6e9682adc git Not specified
CNA Linux Linux affected 5.4 Not specified
CNA Linux Linux unaffected 5.4 semver Not specified
CNA Linux Linux unaffected 5.4.297 5.4.* semver Not specified
CNA Linux Linux unaffected 5.10.241 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.190 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.149 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.103 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.43 6.12.* semver Not specified
CNA Linux Linux unaffected 6.15.11 6.15.* semver Not specified
CNA Linux Linux unaffected 6.16.2 6.16.* semver Not specified
CNA Linux Linux unaffected 6.17 * original_commit_for_fix Not specified
ADP Siemens SIMATIC CN 4100 affected V5.0 custom Not specified

References

ReferenceSourceLinkTags
lists.debian.org/debian-lts-announce/2025/10/msg00008.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Mailing List, Third Party Advisory
git.kernel.org/stable/c/9f1f4e95031f84867c5821540466d62f88dab8ca 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/8d2d22a55ffe35c38e69795468a7addd1a80e9ce 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/f014c10d190b92aad366e56b445daffcd1c075e4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/926092268efdf1ed7b55cf486356c74a9e7710d1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
cert-portal.siemens.com/productcert/html/ssa-032379.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
git.kernel.org/stable/c/e21a3ddd58733ce31afcb1e5dc3cb80a4b5bc29b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/9b80430c194e4a114dc663c1025d56b4f3d0153d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/1ef72a7fedc5bca70e8cc980985790de10d407aa 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/a04de4c40aab9b338dfa989cf4aec70fd187eeb2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
lists.debian.org/debian-lts-announce/2025/10/msg00007.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Mailing List, Third Party Advisory
git.kernel.org/stable/c/d1534ae23c2b6be350c8ab060803fbf6e9682adc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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