{"id":"CVE-2025-40306","title":"In the Linux kernel, the following vulnerability has been resolved:\n\norangefs: fix xattr related buffer overflow...\n\nWilly Tarreau <w@1wt.eu> forwarded me a message from\nDisclosure <disclosure@aisle.com> with the following\nwarning:\n\n> Th…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\norangefs: fix xattr related buffer overflow...\n\nWilly Tarreau <w@1wt.eu> forwarded me a message from\nDisclosure <disclosure@aisle.com> with the following\nwarning:\n\n> Th…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","published":"2025-12-08","updated":"2026-10-14","sourceUpdated":"2026-10-14T22:10:00.210","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-40306","references":[{"url":"https://git.kernel.org/stable/c/025e880759c279ec64d0f754fe65bf45961da864","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/15afebb9597449c444801d1ff0b8d8b311f950ab","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/9127d1e90c90e5960c8bc72a4ce2c209691a7021","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/bc812574de633cf9a9ad6974490e45f6a4bb5126","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/c2ca015ac109fd743fdde27933d59dc5ad46658e","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/c6564ff6b53c9a8dc786b6f1c51ae7688273f931","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/e09a096104fc65859422817fb2211f35855983fe","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/ef892d2bf4f3fa2c8de1677dd307e678bdd3d865","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd"],"epss":0.00161,"epssPercentile":0.04783,"ingestedAt":"2026-10-14T23:00:02.020Z","slug":"CVE-2025-40306","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\norangefs: fix xattr related buffer overflow...\n\nWilly Tarreau <w@1wt.eu> forwarded me a message from\nDisclosure <disclosure@aisle.com> with the following\nwarning:\n\n> The helper `xattr_key()` uses the pointer variable in the loop condition\n> rather than dereferencing it. As `key` is incremented, it remains non-NULL\n> (until it runs into unmapped memory), so the loop does not terminate on\n> valid C strings and will walk memory indefinitely, consuming CPU or hanging\n> the thread.\n\nI easily reproduced this with setfattr and getfattr, causing a kernel\noops, hung user processes and corrupted orangefs files. Disclosure\nsent along a diff (not a patch) with a suggested fix, which I based\nthis patch on.\n\nAfter xattr_key started working right, xfstest generic/069 exposed an\nxattr related memory leak that lead to OOM. xattr_key returns\na hashed key.  When adding xattrs to the orangefs xattr cache, orangefs\nused hash_add, a kernel hashing macro. hash_add also hashes the key using\nhash_log which resulted in additions to the xattr cache going to the wrong\nhash bucket. generic/069 tortures a single file and orangefs does a\ngetattr for the xattr \"security.capability\" every time. Orangefs\nnegative caches on xattrs which includes a kmalloc. Since adds to the\nxattr cache were going to the wrong bucket, every getattr for\n\"security.capability\" resulted in another kmalloc, none of which were\never freed.\n\nI changed the two uses of hash_add to hlist_add_head instead\nand the memory leak ceased and generic/069 quit throwing furniture.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}