nfsd: reset write verifier on deferred writeback errors

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Summary

CVECVE-2026-53393
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-19 12:16:50 UTC
Updated2026-07-19 12:16:50 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: nfsd: reset write verifier on deferred writeback errors nfsd_vfs_write() and nfsd_commit() both call filemap_check_wb_err() to detect deferred writeback errors, but neither rotates the server's write verifier (nn->writeverf) when this check fails. Every other durable-storage-failure path in these functions calls commit_reset_write_verifier() before returning an error. The missing rotation means clients holding UNSTABLE write data under the current verifier will COMMIT, receive the unchanged verifier back, and conclude their data is durable — silently dropping data that failed writeback. This violates the UNSTABLE+COMMIT durability contract (RFC 1813 §3.3.7, RFC 8881 §18.32). Add commit_reset_write_verifier() calls at both filemap_check_wb_err() error sites, matching the pattern used by adjacent error paths in the same functions. The helper already filters -EAGAIN and -ESTALE internally, so the calls are unconditionally safe.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 555dbf1a9aac6d3150c8b52fa35f768a692f4eeb 1dd664b39774a9c89b72de8e59bf9ef4b3aaff2e git Not specified
CNA Linux Linux affected 555dbf1a9aac6d3150c8b52fa35f768a692f4eeb 4367afc119c51e17a616f6908772b7e2c2c4013f git Not specified
CNA Linux Linux affected 555dbf1a9aac6d3150c8b52fa35f768a692f4eeb b027cca33c97354149fcc0ddeede4525c41093cd git Not specified
CNA Linux Linux affected 555dbf1a9aac6d3150c8b52fa35f768a692f4eeb 2090b05803faab8a9fa62fbff871007862cac1b7 git Not specified
CNA Linux Linux affected f14816f2f928c560d28ba344af689f56efcd6f55 git Not specified
CNA Linux Linux affected 3145fe0ebb16e1715ad541a301bc6675c8375fcd git Not specified
CNA Linux Linux affected 5.10.124 5.11 semver Not specified
CNA Linux Linux affected 5.15.49 5.16 semver Not specified
CNA Linux Linux affected 5.17 Not specified
CNA Linux Linux unaffected 5.17 semver Not specified
CNA Linux Linux unaffected 6.12.95 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.38 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.3 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/4367afc119c51e17a616f6908772b7e2c2c4013f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b027cca33c97354149fcc0ddeede4525c41093cd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1dd664b39774a9c89b72de8e59bf9ef4b3aaff2e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2090b05803faab8a9fa62fbff871007862cac1b7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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