Description
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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
27992ef80770d61a57f6c3a551735b08cefdffa3 to < 7de93abfaae1b2dc94da8a07a36421bd073f1d8faffected27992ef80770d61a57f6c3a551735b08cefdffa3 to < 474ce83c96a55f2eeb14dee2be375eeadfdacdf5affected27992ef80770d61a57f6c3a551735b08cefdffa3 to < 51a8de6c50bf947c8f534cd73da4c8f0a13e7bedaffected
Linux Linux
Default version status: affected
6.15affected0 to < 6.15unaffected6.18.25 to ≤ 6.18.*unaffected7.0.2 to ≤ 7.0.*unaffected7.1 to ≤ *unaffected