exfat: fix improper check of dentry.stream.valid_size (Linux Linux)

CVE-2025-40287
Non disponible

En bref

Source
NVD
EPSS
EPSS 0.18 % · centile 8 ()
État
PUBLISHED
Publiée
Mise à jour
Attribuée par
Linux
Statut NVD
Deferred

Description

In the Linux kernel, the following vulnerability has been resolved: exfat: fix improper check of dentry.stream.valid_size We found an infinite loop bug in the exFAT file system that can lead to a Denial-of-Service (DoS) condition. When a dentry in an exFAT filesystem is malformed, the following system calls — SYS_openat, SYS_ftruncate, and SYS_pwrite64 — can cause the kernel to hang. Root cause analysis shows that the size validation code in exfat_find() does not check whether dentry.stream.valid_size is negative. As a result, the system calls mentioned above can succeed and eventually trigger the DoS issue. This patch adds a check for negative dentry.stream.valid_size to prevent this vulnerability.

Références

Références européennes

Avis du CERT-FR

Produits affectés

ProduitVersions
Linux · Linuxaffected 11a347fb6cef62ce47e84b97c45f2b2497c7593b < 6c627bcc1896ba62ec793d0c00da74f3c93ce3ad ; affected 11a347fb6cef62ce47e84b97c45f2b2497c7593b < 204b1b02ee018ba52ad2ece21fe3a8643d66a1b2 ; affected 11a347fb6cef62ce47e84b97c45f2b2497c7593b < 82ebecdc74ff555daf70b811d854b1f32a296bea
Linux · Linuxaffected 6.8 ; unaffected 0 < 6.8 ; unaffected 6.12.59 ≤ 6.12.* ; unaffected 6.17.9 ≤ 6.17.* ; unaffected 6.18 ≤ *

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