cifs: use cifs_invalidate_cache() in cifs_do_truncate() for O_TRUNC

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89639
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-11 20:19:49 UTC
Updated2026-09-11 20:19:49 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: cifs: use cifs_invalidate_cache() in cifs_do_truncate() for O_TRUNC cifs_do_truncate() is invoked from cifs_open() without i_rwsem, so it cannot use cifs_resize_file_locked() to perform a proper fscache cookie resize. Instead, add cifs_invalidate_cache() after cifs_setsize(). cifs_invalidate_cache() calls fscache_invalidate(), which works without holding i_rwsem: it unconditionally increments inval_counter and sets FSCACHE_COOKIE_NO_DATA_TO_READ, ensuring that stale cached data is not served once the cookie is later activated by fscache_use_cookie(). Truncation to zero leaves no valid cached data, making invalidation the correct semantic here.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected efbcecdecefc26fa062c0e8210533ccad7d6bd4a 8b9b10fe5b8b492b27b9f4546742ea541a650213 git Not specified
CNA Linux Linux affected fa724e235cfdb0fb0bb427d0f9dfe864ae27403e 81fc3868a7f726980ff845c1d0d271051e5f0f45 git Not specified
CNA Linux Linux affected fa724e235cfdb0fb0bb427d0f9dfe864ae27403e 364b183230586a62660a7280c1eb20138338eeb5 git Not specified
CNA Linux Linux affected 6838bcac954487cc0a3c8a4ee1b3a3a30e244dc9 git Not specified
CNA Linux Linux affected 75640976cf474eb41682a13f2dbe9534ac26ca50 git Not specified
CNA Linux Linux affected 3513f3931c579ba2a715784c6dedc59e0d9282ee git Not specified
CNA Linux Linux affected 6.18.44 6.18.50 semver Not specified
CNA Linux Linux affected 6.12.105 6.13 semver Not specified
CNA Linux Linux affected 7.1.8 7.2 semver Not specified
CNA Linux Linux affected 7.2 Not specified
CNA Linux Linux unaffected 7.2 semver Not specified
CNA Linux Linux unaffected 6.18.50 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.4 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/81fc3868a7f726980ff845c1d0d271051e5f0f45 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/364b183230586a62660a7280c1eb20138338eeb5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8b9b10fe5b8b492b27b9f4546742ea541a650213 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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