CVE-2026-53393
Estado: AnalizadaMedia (5.5)—
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).
Leer descripción completaMostrar menos
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.
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Puntuación base: 5.5
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.13%
- Percentil entre todas las CVEs puntuadas: 2
- Fecha de la puntuación: 4/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (1)
CWE
- NVD-CWE-noinfo
Referencias
- https://git.kernel.org/stable/c/1dd664b39774a9c89b72de8e59bf9ef4b3aaff2e
- https://git.kernel.org/stable/c/2090b05803faab8a9fa62fbff871007862cac1b7
- https://git.kernel.org/stable/c/4367afc119c51e17a616f6908772b7e2c2c4013f
- https://git.kernel.org/stable/c/43b65d2997963e80e8d8d86520bcb1e0751227de
- https://git.kernel.org/stable/c/666e837b247fcadf2d8d508b9b0e49d720393eb4
- https://git.kernel.org/stable/c/b027cca33c97354149fcc0ddeede4525c41093cd
- https://git.kernel.org/stable/c/b8e5894e56cff70fa245628fe16f0ad6367f8090
- https://git.kernel.org/stable/c/bc2baca02ec56da7707a74ed5d340b0a1dff1841
JSON original (NVD)
Mostrar
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