netfs, afs: Fix write skipping in dir/link writepages

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Summary

CVECVE-2026-64156
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-19 16:17:57 UTC
Updated2026-07-19 16:17:57 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: netfs, afs: Fix write skipping in dir/link writepages Fix netfs_write_single() and afs_single_writepages() to better handle a write that would be skipped due to lock contention and WB_SYNC_NONE by returning 1 from netfs_write_single() if it skipped and making afs_single_writepages() skip also. If a skip occurs, the inode must be re-marked as the VFS may have cleared the mark. This is really only theoretical for directories in netfs_write_single() as the only path to that is through afs_single_writepages() that takes the ->validate_lock around it, thereby serialising it.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 6dd80936618c4ff852d4db73aca400351d9bd9f0 77bb293049d61e04c12b24ebbffafaf5ab36af90 git Not specified
CNA Linux Linux affected 6dd80936618c4ff852d4db73aca400351d9bd9f0 f91e10435c0dd37c48b1b25e6236284f656ddc0c git Not specified
CNA Linux Linux affected 6dd80936618c4ff852d4db73aca400351d9bd9f0 9871938f99cc6cb266a77265491660e2375271f5 git Not specified
CNA Linux Linux affected 6.14 Not specified
CNA Linux Linux unaffected 6.14 semver Not specified
CNA Linux Linux unaffected 6.18.34 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.11 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/9871938f99cc6cb266a77265491660e2375271f5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/77bb293049d61e04c12b24ebbffafaf5ab36af90 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f91e10435c0dd37c48b1b25e6236284f656ddc0c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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