Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: nfsd: fix stale s2s_cp_stateids IDR entry for async COPY For an async COPY, nfsd4_copy() called nfs4_init_copy_state() before dup_copy_fields(), so the s2s_cp_stateids IDR was pointed at &u->copy->cp_stateid -- memory in the per-rqstp COMPOUND buffer that is reused by the next request. dup_copy_fields() copies only the value into async_copy, so the IDR slot dangled at the transient buffer for the whole background copy. Any IDR walker then dereferences reused request memory: the laundromat reads cs_type from it and, if the bytes look like an expired NFS4_COPYNOTIFY_STID, follows into refcount_dec()/idr_remove()/kfree() on garbage; manage_cpntf_state() has the same exposure via idr_find(). Duplicate the fields first, then register the stateid on the stable async_copy. result->cb_stateid is unchanged.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected e0639dc5805a9d4faaa2c07ad98fa853b9529dd3 before bdce362f49410b9def65d76c21f6259cd89696d8; affected e0639dc5805a9d4faaa2c07ad98fa853b9529dd3 before 7aa34ea78f74e6ef60c8112635a87fc43d57f6c9; affected e0639dc5805a9d4faaa2c07ad98fa853b9529dd3 before 9b4e5e9ba5ae13808b8a6d229d87c54611ba0e7a; affected e0639dc5805a9d4faaa2c07ad98fa853b9529dd3 before 14b978e8d05ce018d0afbeb6611833ef91713a02; affected e0639dc5805a9d4faaa2c07ad98fa853b9529dd3 before d0beaee498e11880e72826026db0e9c9890fc114 |
| Linux / Linux | affected 4.20; unaffected 0 before 4.20; unaffected 6.6.160 through 6.6.*; unaffected 6.12.111 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/bdce362f49410b9def65d76c21f6259cd89696d8
- https://git.kernel.org/stable/c/7aa34ea78f74e6ef60c8112635a87fc43d57f6c9
- https://git.kernel.org/stable/c/9b4e5e9ba5ae13808b8a6d229d87c54611ba0e7a
- https://git.kernel.org/stable/c/14b978e8d05ce018d0afbeb6611833ef91713a02
- https://git.kernel.org/stable/c/d0beaee498e11880e72826026db0e9c9890fc114
ADP enrichment
No English description supplied.
No references supplied.