Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: NFSD: Prevent lock owner use-after-free during client teardown __destroy_client() releases a client's open owners, but a lock owner whose only reference is a blocked lock (nbl) stays on cl_ownerstr_hashtbl. client_has_state() does not count a bare owner, so DESTROY_CLIENTID can reach __destroy_client() with such owners present. __destroy_client() then walks the table, calling remove_blocked_locks() on each owner without a reference. Freeing a blocked lock drops the owner reference held via flc_owner. The per-net laundromat reaps blocked locks from nn->blocked_locks_lru independently of client state. The two paths share blocked_locks_lock only for the list splice, not the owner's lifetime. The laundromat therefore frees the owner as __destroy_client() dereferences it, a NULL dereference in remove_blocked_locks(). nfsd4_release_lockowner() holds a reference across the same call; __destroy_client() does not. Hold cl_lock across the walk, taking a reference and unhashing each owner, then drop it before remove_blocked_locks() and nfs4_put_stateowner(), which take blocked_locks_lock and cl_lock.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 68ef3bc3166468678d5e1fdd216628c35bd1186f before 42d7954b0a1907d4ef122aef94561952a033cdc3; affected 68ef3bc3166468678d5e1fdd216628c35bd1186f before bb38ff8b4dafbbd1781ad37cd96722fdf2cd972a; affected 68ef3bc3166468678d5e1fdd216628c35bd1186f before b8bad5a11416b26cc7fd4b18fba46d75ff636558; affected 68ef3bc3166468678d5e1fdd216628c35bd1186f before 1ce74d1b7770e69735e8f8e509807af4ff9c8ee7; affected 68ef3bc3166468678d5e1fdd216628c35bd1186f before a6ead6fff3a7d03e49845f048f7000a2e0d34431; affected 68ef3bc3166468678d5e1fdd216628c35bd1186f before 4804c58f73a80d12df1de323bf97a164f6ee8743; affected 68ef3bc3166468678d5e1fdd216628c35bd1186f before 8cf4ff0a7c083dd5e0067f517d63979b74b66649; affected 68ef3bc3166468678d5e1fdd216628c35bd1186f before 5e2fa29d223a9a1e6a948e40b109d09081d1decd; affected e294c4c2d33b7307a89cdf31bec08a112d6a9297; affected 797bfd05d4040fbf766198b3cfcc1838002cc890; affected 0f44e9da465ea259b6c9f31a627f3c50a16e1679; affected 4.9.91 before 4.10; affected 4.14.31 before 4.15; affected 4.15.14 before 4.16 |
| Linux / Linux | affected 4.16; unaffected 0 before 4.16; unaffected 5.10.270 through 5.10.*; unaffected 5.15.221 through 5.15.*; unaffected 6.1.188 through 6.1.*; unaffected 6.6.157 through 6.6.*; unaffected 6.12.109 through 6.12.*; unaffected 6.18.50 through 6.18.*; unaffected 7.2.4 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/42d7954b0a1907d4ef122aef94561952a033cdc3
- https://git.kernel.org/stable/c/bb38ff8b4dafbbd1781ad37cd96722fdf2cd972a
- https://git.kernel.org/stable/c/b8bad5a11416b26cc7fd4b18fba46d75ff636558
- https://git.kernel.org/stable/c/1ce74d1b7770e69735e8f8e509807af4ff9c8ee7
- https://git.kernel.org/stable/c/a6ead6fff3a7d03e49845f048f7000a2e0d34431
- https://git.kernel.org/stable/c/4804c58f73a80d12df1de323bf97a164f6ee8743
- https://git.kernel.org/stable/c/8cf4ff0a7c083dd5e0067f517d63979b74b66649
- https://git.kernel.org/stable/c/5e2fa29d223a9a1e6a948e40b109d09081d1decd
ADP enrichment
No English description supplied.
No references supplied.