Description
In the Linux kernel, the following vulnerability has been resolved: smb/server: avoid deadlock when linking with ReplaceIfExists If smb2_create_link() is called with ReplaceIfExists set and the name does exist then a deadlock will happen. ksmbd_vfs_kern_path_locked() will return with success and the parent directory will be locked. ksmbd_vfs_remove_file() will then remove the file. ksmbd_vfs_link() will then be called while the parent is still locked. It will try to lock the same parent and will deadlock. This patch moves the ksmbd_vfs_kern_path_unlock() call to *before* ksmbd_vfs_link() and then simplifies the code, removing the file_present flag variable.
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
0626e6641f6b467447c81dd7678a69c66f7746cf to < 9d5012ffe14120f978ee34aef4df3d6cb026b7c4affected0626e6641f6b467447c81dd7678a69c66f7746cf to < ac98d54630d5b52e3f684d872f0d82c06c418ea9affected0626e6641f6b467447c81dd7678a69c66f7746cf to < 1e858a7a51c7b8b009d8f246de7ceb7743b44a71affected0626e6641f6b467447c81dd7678a69c66f7746cf to < 814cfdb6358d9b84fcbec9918c8f938cc096a43aaffected0626e6641f6b467447c81dd7678a69c66f7746cf to < a7dddd62578c2eb6cb28b8835556a121b5157323affected0626e6641f6b467447c81dd7678a69c66f7746cf to < a726fef6d7d4cfc365d3434e3916dbfe78991a33affected0626e6641f6b467447c81dd7678a69c66f7746cf to < d5fc1400a34b4ea5e8f2ce296ea12bf8c8421694affected
Linux Linux
Default version status: affected
5.15affected0 to < 5.15unaffected5.15.190 to ≤ 5.15.*unaffected6.1.149 to ≤ 6.1.*unaffected6.6.103 to ≤ 6.6.*unaffected6.12.43 to ≤ 6.12.*unaffected6.15.11 to ≤ 6.15.*unaffected6.16.2 to ≤ 6.16.*unaffected6.17 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/9d5012ffe14120f978ee34aef4df3d6cb026b7c4 ↗
- https://git.kernel.org/stable/c/ac98d54630d5b52e3f684d872f0d82c06c418ea9 ↗
- https://git.kernel.org/stable/c/1e858a7a51c7b8b009d8f246de7ceb7743b44a71 ↗
- https://git.kernel.org/stable/c/814cfdb6358d9b84fcbec9918c8f938cc096a43a ↗
- https://git.kernel.org/stable/c/a7dddd62578c2eb6cb28b8835556a121b5157323 ↗
- https://git.kernel.org/stable/c/a726fef6d7d4cfc365d3434e3916dbfe78991a33 ↗
- https://git.kernel.org/stable/c/d5fc1400a34b4ea5e8f2ce296ea12bf8c8421694 ↗
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html ↗
- https://cert-portal.siemens.com/productcert/html/ssa-032379.html ↗