smb: client: split cifsFileInfo bitfields to avoid shared-byte RMW races

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-98681
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-18 16:17:21 UTC
Updated2026-10-21 13:21:37 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: smb: client: split cifsFileInfo bitfields to avoid shared-byte RMW races The invalidHandle, swapfile, oplock_break_cancelled, offload, and status_file_deleted fields are stored in the same bitfield byte in struct cifsFileInfo, but are updated in different code paths that may run simultaneously, and are protected by different locks. Since bitfield assignments generate byte-level read-modify-write operations, a modification to one flag can overwrite a concurrent modification to another flag. To avoid these races, convert these flags from a bitfield to separate bool fields.

Risk And Classification

EPSS: 0.001680000 probability, percentile 0.057090000 (date 2026-10-21)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 3bc303c254335dbd7c7012cc1760b12f1d5514d3 3b8e7928cf1928555dc05d172dd02fb0e7692ec4 git Not specified
CNA Linux Linux affected 3bc303c254335dbd7c7012cc1760b12f1d5514d3 3786ee67658a2c80fef2544e7de2cd329e043cf9 git Not specified
CNA Linux Linux affected 3bc303c254335dbd7c7012cc1760b12f1d5514d3 4165641d06ef44f3a31b77a28048b6c737e885e7 git Not specified
CNA Linux Linux affected 3bc303c254335dbd7c7012cc1760b12f1d5514d3 d9d23d115610e0342e768f6cb525d91c7b154027 git Not specified
CNA Linux Linux affected 3bc303c254335dbd7c7012cc1760b12f1d5514d3 19465a9aeb664f1d710d0d22c07c31bfb7c85446 git Not specified
CNA Linux Linux affected 2.6.32 Not specified
CNA Linux Linux unaffected 2.6.32 semver Not specified
CNA Linux Linux unaffected 6.6.160 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.113 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.56 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.10 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/3786ee67658a2c80fef2544e7de2cd329e043cf9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3b8e7928cf1928555dc05d172dd02fb0e7692ec4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d9d23d115610e0342e768f6cb525d91c7b154027 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/19465a9aeb664f1d710d0d22c07c31bfb7c85446 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4165641d06ef44f3a31b77a28048b6c737e885e7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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