ocfs2/dlm: validate qr_numregions in dlm_match_regions()

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Summary

CVECVE-2026-53043
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-24 17:17:16 UTC
Updated2026-07-14 19:27:29 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: ocfs2/dlm: validate qr_numregions in dlm_match_regions() Patch series "ocfs2/dlm: fix two bugs in dlm_match_regions()". In dlm_match_regions(), the qr_numregions field from a DLM_QUERY_REGION network message is used to drive loops over the qr_regions buffer without sufficient validation. This series fixes two issues: - Patch 1 adds a bounds check to reject messages where qr_numregions exceeds O2NM_MAX_REGIONS. The o2net layer only validates message byte length; it does not constrain field values, so a crafted message can set qr_numregions up to 255 and trigger out-of-bounds reads past the 1024-byte qr_regions buffer. - Patch 2 fixes an off-by-one in the local-vs-remote comparison loop, which uses '<=' instead of '<', reading one entry past the valid range even when qr_numregions is within bounds. This patch (of 2): The qr_numregions field from a DLM_QUERY_REGION network message is used directly as loop bounds in dlm_match_regions() without checking against O2NM_MAX_REGIONS. Since qr_regions is sized for at most O2NM_MAX_REGIONS (32) entries, a crafted message with qr_numregions > 32 causes out-of-bounds reads past the qr_regions buffer. Add a bounds check for qr_numregions before entering the loops.

Risk And Classification

Primary CVSS: v3.1 9.1 CRITICAL from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.005210000 probability, percentile 0.405820000 (date 2026-07-13)

Problem Types: CWE-787

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
3.1CNADECLARED9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

CVSS v3.1 Breakdown

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

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/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 ea2034416b54700e30371f2ad6517cbb94674083 d3d5efade0c79dac1cac98c0cb1115432f804439 git Not specified
CNA Linux Linux affected ea2034416b54700e30371f2ad6517cbb94674083 f69551139caf6d24242a0ad049ee46b264e3aee0 git Not specified
CNA Linux Linux affected ea2034416b54700e30371f2ad6517cbb94674083 1f8b91275912cd428289c1fb424bebd7ff5302bd git Not specified
CNA Linux Linux affected ea2034416b54700e30371f2ad6517cbb94674083 f37de46149db49abd2b24f4f0c5a88cf4dfb5f47 git Not specified
CNA Linux Linux affected ea2034416b54700e30371f2ad6517cbb94674083 6c6e8fc3c007319981647b410c29bb5775048551 git Not specified
CNA Linux Linux affected ea2034416b54700e30371f2ad6517cbb94674083 3f474c33ebc2e2ca3fcb587d7de4375348f13373 git Not specified
CNA Linux Linux affected ea2034416b54700e30371f2ad6517cbb94674083 3c2d0de23ae4be22b6c18e8f0915be74d3b5fb21 git Not specified
CNA Linux Linux affected ea2034416b54700e30371f2ad6517cbb94674083 7ab3fbb01bc6d79091bc375e5235d360cd9b78be git Not specified
CNA Linux Linux affected 2.6.37 Not specified
CNA Linux Linux unaffected 2.6.37 semver Not specified
CNA Linux Linux unaffected 5.10.258 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.209 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.175 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.141 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.91 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.33 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.10 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/d3d5efade0c79dac1cac98c0cb1115432f804439 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/3c2d0de23ae4be22b6c18e8f0915be74d3b5fb21 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/3f474c33ebc2e2ca3fcb587d7de4375348f13373 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/1f8b91275912cd428289c1fb424bebd7ff5302bd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/f69551139caf6d24242a0ad049ee46b264e3aee0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/f37de46149db49abd2b24f4f0c5a88cf4dfb5f47 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/7ab3fbb01bc6d79091bc375e5235d360cd9b78be 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/6c6e8fc3c007319981647b410c29bb5775048551 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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