CVE-2026-31694

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