Description
In the Linux kernel, the following vulnerability has been resolved: filelock: Remove locks reliably when fcntl/close race is detected When fcntl_setlk() races with close(), it removes the created lock with do_lock_file_wait(). However, LSMs can allow the first do_lock_file_wait() that created the lock while denying the second do_lock_file_wait() that tries to remove the lock. Separately, posix_lock_file() could also fail to remove a lock due to GFP_KERNEL allocation failure (when splitting a range in the middle). After the bug has been triggered, use-after-free reads will occur in lock_get_status() when userspace reads /proc/locks. This can likely be used to read arbitrary kernel memory, but can't corrupt kernel memory. Fix it by calling locks_remove_posix() instead, which is designed to reliably get rid of POSIX locks associated with the given file and files_struct and is also used by filp_flush().
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
c293621bbf678a3d85e3ed721c3921c8a670610d to < d30ff33040834c3b9eee29740acd92f9c7ba2250affectedc293621bbf678a3d85e3ed721c3921c8a670610d to < dc2ce1dfceaa0767211a9d963ddb029ab21c4235affectedc293621bbf678a3d85e3ed721c3921c8a670610d to < 5661b9c7ec189406c2dde00837aaa4672efb6240affectedc293621bbf678a3d85e3ed721c3921c8a670610d to < 52c87ab18c76c14d7209646ccb3283b3f5d87b22affectedc293621bbf678a3d85e3ed721c3921c8a670610d to < ef8fc41cd6f95f9a4a3470f085aecf350569a0b3affectedc293621bbf678a3d85e3ed721c3921c8a670610d to < 5f5d0799eb0a01d550c21b7894e26b2d9db55763affectedc293621bbf678a3d85e3ed721c3921c8a670610d to < b6d223942c34057fdfd8f149e763fa823731b224affectedc293621bbf678a3d85e3ed721c3921c8a670610d to < 3cad1bc010416c6dd780643476bc59ed742436b9affected
Linux Linux
Default version status: affected
2.6.13affected0 to < 2.6.13unaffected4.19.319 to ≤ 4.19.*unaffected5.4.281 to ≤ 5.4.*unaffected5.10.223 to ≤ 5.10.*unaffected5.15.164 to ≤ 5.15.*unaffected6.1.101 to ≤ 6.1.*unaffected6.6.42 to ≤ 6.6.*unaffected6.9.9 to ≤ 6.9.*unaffected6.10 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/d30ff33040834c3b9eee29740acd92f9c7ba2250 ↗
- https://git.kernel.org/stable/c/dc2ce1dfceaa0767211a9d963ddb029ab21c4235 ↗
- https://git.kernel.org/stable/c/5661b9c7ec189406c2dde00837aaa4672efb6240 ↗
- https://git.kernel.org/stable/c/52c87ab18c76c14d7209646ccb3283b3f5d87b22 ↗
- https://git.kernel.org/stable/c/ef8fc41cd6f95f9a4a3470f085aecf350569a0b3 ↗
- https://git.kernel.org/stable/c/5f5d0799eb0a01d550c21b7894e26b2d9db55763 ↗
- https://git.kernel.org/stable/c/b6d223942c34057fdfd8f149e763fa823731b224 ↗
- https://git.kernel.org/stable/c/3cad1bc010416c6dd780643476bc59ed742436b9 ↗
- https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html ↗