Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: smb: client: avoid using uninitialized SIDs in cifs_posix_to_fattr() cifs_posix_to_fattr() ignores the return value of posix_info_parse(). When a malformed POSIX directory entry is encountered (e.g. invalid SID lengths from an untrusted server), posix_info_parse() returns -1 without populating the 'parsed' struct. The uninitialized stack memory in parsed.owner and parsed.group is then passed to sid_to_id(), which processes the garbage bytes and passes them to request_key() to construct a SID string, potentially leaking kernel stack contents to the userspace idmap daemon. Fix this by checking the return value and skipping the SID-to-id mapping when parsing fails. The remaining fattr fields (timestamps, mode, etc.) are populated directly from the 'info' pointer so they are unaffected.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 9934430e2178d5164eb1ac91a9b092f9e7e64745 before 604feb3e8141bf11f5afd48d36d401fee5af9536; affected 9934430e2178d5164eb1ac91a9b092f9e7e64745 before 33106019c3be57b5fc6411cfaad6d98214a51265; affected 9934430e2178d5164eb1ac91a9b092f9e7e64745 before 2be31f252ade791b84f7164991f14436aed1d4b9; affected 9934430e2178d5164eb1ac91a9b092f9e7e64745 before c9a8b60ce140a68d172452f418137fc7ddbae7db; affected 9934430e2178d5164eb1ac91a9b092f9e7e64745 before da6e25842431982d5a53cf00d925b98c690f4467; affected dd80b98bdf0a4b3206739f3513b0518f27a7b4ef; affected d8e39c11f66125f49de55537a6efc8ecadf4a0f7; affected 5.8.17 before 5.9; affected 5.9.2 before 5.10 |
| Linux / Linux | affected 5.10; unaffected 0 before 5.10; unaffected 6.6.160 through 6.6.*; unaffected 6.12.114 through 6.12.*; unaffected 6.18.57 through 6.18.*; unaffected 7.2.7 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/604feb3e8141bf11f5afd48d36d401fee5af9536
- https://git.kernel.org/stable/c/33106019c3be57b5fc6411cfaad6d98214a51265
- https://git.kernel.org/stable/c/2be31f252ade791b84f7164991f14436aed1d4b9
- https://git.kernel.org/stable/c/c9a8b60ce140a68d172452f418137fc7ddbae7db
- https://git.kernel.org/stable/c/da6e25842431982d5a53cf00d925b98c690f4467