CVE-2026-31694

CVE-2026-31694 · fuse: reject oversized dirents in page cache

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In the Linux kernel, the following vulnerability has been resolved: fuse: reject oversized dirents in page cache fuse_add_dirent_to_cache() computes a serialized dirent size from the server-controlled namelen field and copies the dirent into a single page-cache page. The existing logic only checks whether the dirent fits in the remaining space of the current page and advances to a fresh page if not. It never checks whether the dirent itself exceeds PAGE_SIZE. As a result, a malicious FUSE server can return a dirent with namelen=4095, producing a serialized record size of 4120 bytes. On 4 KiB page systems this causes memcpy() to overflow the cache page by 24 bytes into the following kernel page. Reject dirents that cannot fit in a single page before copying them into the readdir cache.

CVSS 7.8 · Élevée · EPSS 0,3% · Code d’exploitation public · Correctif disponible

Publication

2026-05-01T13:53:36.048Z

Mise à jour

2026-10-15T01:17:53.619Z

Pile logicielle: system

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