erofs: unify lcn as u64 for 32-bit platforms

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Summary

CVECVE-2026-53015
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-24 17:17:12 UTC
Updated2026-07-15 13:55:28 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: erofs: unify lcn as u64 for 32-bit platforms As sashiko reported [1], `lcn` was typed as `unsigned long` (or `unsigned int` sometimes), which is only 32 bits wide on 32-bit platforms, which causes `(lcn << lclusterbits)` to be truncated at 4 GiB. In order to consolidate the logic, just use `u64` consistently around the codebase. [1] https://sashiko.dev/r/20260420034612.1899973-1-hsiangkao%40linux.alibaba.com

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

EPSS: 0.001680000 probability, percentile 0.063460000 (date 2026-07-13)

Problem Types: NVD-CWE-noinfo

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 152a333a589560bee002e4c96761f1b560a5793c 4fc9b12e43a3f19a01a8fb61f7961be79de20253 git Not specified
CNA Linux Linux affected 152a333a589560bee002e4c96761f1b560a5793c 858e4d98a86adf34584767388deb6c9b217f70c5 git Not specified
CNA Linux Linux affected 152a333a589560bee002e4c96761f1b560a5793c 582b0bf201157632cb5474c885989a6ebda46521 git Not specified
CNA Linux Linux affected 152a333a589560bee002e4c96761f1b560a5793c 2d8c7edcb661812249469f4a5b62e9339118846f git Not specified
CNA Linux Linux affected 5.3 Not specified
CNA Linux Linux unaffected 5.3 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/582b0bf201157632cb5474c885989a6ebda46521 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/4fc9b12e43a3f19a01a8fb61f7961be79de20253 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/2d8c7edcb661812249469f4a5b62e9339118846f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/858e4d98a86adf34584767388deb6c9b217f70c5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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