dlm: prevent NPD when writing a positive value to event_done

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Summary

CVECVE-2025-23131
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-04-16 15:16:07 UTC
Updated2026-07-04 12:16:52 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: dlm: prevent NPD when writing a positive value to event_done do_uevent returns the value written to event_done. In case it is a positive value, new_lockspace would undo all the work, and lockspace would not be set. __dlm_new_lockspace, however, would treat that positive value as a success due to commit 8511a2728ab8 ("dlm: fix use count with multiple joins"). Down the line, device_create_lockspace would pass that NULL lockspace to dlm_find_lockspace_local, leading to a NULL pointer dereference. Treating such positive values as successes prevents the problem. Given this has been broken for so long, this is unlikely to break userspace expectations.

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-476

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 8511a2728ab82cab398e39d019f5cf1246021c1c a1c41aebb184d9228a440dcb6761224e65b0e49a git Not specified
CNA Linux Linux affected 8511a2728ab82cab398e39d019f5cf1246021c1c ee28d99d789b077565cbe0377374d1e826c64d93 git Not specified
CNA Linux Linux affected 8511a2728ab82cab398e39d019f5cf1246021c1c c7837e2c96559663c33f43da403d9cf3cf77cfa7 git Not specified
CNA Linux Linux affected 8511a2728ab82cab398e39d019f5cf1246021c1c 7109d69bec6edce546dc870e66bd2b668a3d5549 git Not specified
CNA Linux Linux affected 8511a2728ab82cab398e39d019f5cf1246021c1c 10b7a59814765d18d43555c9cef4eb3048b7e8a3 git Not specified
CNA Linux Linux affected 8511a2728ab82cab398e39d019f5cf1246021c1c b73c4ad4d387fe5bc988145bd9f1bc0de76afd5c git Not specified
CNA Linux Linux affected 8511a2728ab82cab398e39d019f5cf1246021c1c 8e2bad543eca5c25cd02cbc63d72557934d45f13 git Not specified
CNA Linux Linux affected 2.6.31 Not specified
CNA Linux Linux unaffected 2.6.31 semver Not specified
CNA Linux Linux unaffected 5.10.260 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.211 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.177 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.144 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.95 6.12.* semver Not specified
CNA Linux Linux unaffected 6.14.2 6.14.* semver Not specified
CNA Linux Linux unaffected 6.15 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/a1c41aebb184d9228a440dcb6761224e65b0e49a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/10b7a59814765d18d43555c9cef4eb3048b7e8a3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ee28d99d789b077565cbe0377374d1e826c64d93 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7109d69bec6edce546dc870e66bd2b668a3d5549 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c7837e2c96559663c33f43da403d9cf3cf77cfa7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8e2bad543eca5c25cd02cbc63d72557934d45f13 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/b73c4ad4d387fe5bc988145bd9f1bc0de76afd5c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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