Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: NFSD: Prevent client use-after-free during close_lru reaping An nfs4_openowner left on nn->close_lru after its final CLOSE keeps its last closed stateid in oo_last_closed_stid, holding only a raw pointer to its nfs4_client. The laundromat reaps timed-out entries, drops nn->client_lock, and calls nfs4_put_stid(), which dereferences the client through cl_lock. Nothing pins the client across that window, so a concurrent force_expire_client() can free it and nfs4_put_stid() reads freed memory. __destroy_client() hits the same race, walking clp->cl_openowners without cl_lock. Pin the client with cl_rpc_users before dropping client_lock, and skip clients already expiring. __destroy_client() then cleans up its own close_lru entries through release_last_closed_stateid(), so teardown no longer races the laundromat.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 217526e7ecc9f6f243e976772e81eab7ab986a4c before adc34b5df5c5d87043cb500b0867fc1c4ad0117e; affected 217526e7ecc9f6f243e976772e81eab7ab986a4c before 0763482227822f7343557f086afc382086d56c4c; affected 217526e7ecc9f6f243e976772e81eab7ab986a4c before 83dd59ac1c3455c2c7d8ddb582d980a13199b9b3; affected 217526e7ecc9f6f243e976772e81eab7ab986a4c before e57a9ed34ea8c17e831de59b8f1a6b2d80d347a1; affected 217526e7ecc9f6f243e976772e81eab7ab986a4c before 2330b788d732f43668b965b3105b37ceb276dfea |
| Linux / Linux | affected 3.17; unaffected 0 before 3.17; unaffected 6.6.160 through 6.6.*; unaffected 6.12.111 through 6.12.*; unaffected 6.18.51 through 6.18.*; unaffected 7.2.5 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/adc34b5df5c5d87043cb500b0867fc1c4ad0117e
- https://git.kernel.org/stable/c/0763482227822f7343557f086afc382086d56c4c
- https://git.kernel.org/stable/c/83dd59ac1c3455c2c7d8ddb582d980a13199b9b3
- https://git.kernel.org/stable/c/e57a9ed34ea8c17e831de59b8f1a6b2d80d347a1
- https://git.kernel.org/stable/c/2330b788d732f43668b965b3105b37ceb276dfea