nfsd: reset write verifier on deferred writeback errors (Linux Linux)

CVE-2026-53393
MEDIUM 5.5

En bref

Source
NVD
EPSS
EPSS 0.13 % · centile 3 ()
État
PUBLISHED
Publiée
Mise à jour
Attribuée par
Linux
Statut NVD
Analyzed

Description

In 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.

Références

Scores

VersionScoreVecteurÉvalué par
CVSS 3.1MEDIUM 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HNVD · nvd@nist.gov (Primary)

Références européennes

Avis du CERT-FR

Configurations affectées (CPE NVD)

Produits affectés

ProduitVersions
Linux · Linuxaffected f14816f2f928c560d28ba344af689f56efcd6f55 < b8e5894e56cff70fa245628fe16f0ad6367f8090 ; affected 3145fe0ebb16e1715ad541a301bc6675c8375fcd < bc2baca02ec56da7707a74ed5d340b0a1dff1841 ; affected 555dbf1a9aac6d3150c8b52fa35f768a692f4eeb < 43b65d2997963e80e8d8d86520bcb1e0751227de ; affected 555dbf1a9aac6d3150c8b52fa35f768a692f4eeb < 666e837b247fcadf2d8d508b9b0e49d720393eb4 ; affected 555dbf1a9aac6d3150c8b52fa35f768a692f4eeb < 1dd664b39774a9c89b72de8e59bf9ef4b3aaff2e ; affected 555dbf1a9aac6d3150c8b52fa35f768a692f4eeb < 4367afc119c51e17a616f6908772b7e2c2c4013f
Linux · Linuxaffected 5.17 ; unaffected 0 < 5.17 ; unaffected 5.10.261 ≤ 5.10.* ; unaffected 5.15.212 ≤ 5.15.* ; unaffected 6.1.178 ≤ 6.1.* ; unaffected 6.6.145 ≤ 6.6.*

Sources

SourceLicence
CVE List (CVEProject cvelistV5)CVE Program Terms of Use
EPSS (FIRST.org)FIRST — attribution requested
ENISA EUVDENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feedsPublic domain — this product uses data from the NVD API but is not endorsed or certified by the NVD