Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: nfsd: initialize copy-notify stateid before publishing it nfsd4_copy_notify() finished initializing the cpntf state after nfs4_alloc_init_cpntf_state() had already linked it into the s2s_cp_stateids IDR and the parent's sc_cp_list, with cs_count == 1 (the membership reference) and none held for the caller. A racing OFFLOAD_CANCEL (crafted cl_id == nn->s2s_cp_cl_id plus the guessable so_id) could reach manage_cpntf_state() and free the entry, turning the caller's subsequent cpn_cnr_stateid read and cp_p_stateid/cp_p_clid writes into use-after-free. The owning clientid was also only recorded after publication, so it could not gate an ownership check in that window. Record cp_p_stateid and cp_p_clid inside nfs4_alloc_init_cpntf_state() before nfs4_init_cp_state() publishes the entry, and return it with an extra reference. The caller reads the stateid under that reference and drops it with nfs4_put_cpntf_state(); on a late error the laundromat reaps the entry.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 624322f1adc58acd0b69f77a6ddc764207e97241 before 863b6e995665472f2af5be2436a874ab6a9e5ac6; affected 624322f1adc58acd0b69f77a6ddc764207e97241 before d18d36395d973ef7372c8e6724970585f75b5c0b; affected 624322f1adc58acd0b69f77a6ddc764207e97241 before 4415a692346a39fdb647cbd717eda510159aaf55; affected 624322f1adc58acd0b69f77a6ddc764207e97241 before 9caad13b7cfe9ccb90cc405ac77335800e086595; affected 624322f1adc58acd0b69f77a6ddc764207e97241 before e08a3dcaca0505f861e344a387f37f94d95dbdc2; affected 624322f1adc58acd0b69f77a6ddc764207e97241 before a4d7fedcaaf33e60a01e53eafca9041ef966212f; affected 624322f1adc58acd0b69f77a6ddc764207e97241 before 4cdef96892f4fa6e70c405b6e8f2fd6972f3b64b; affected 624322f1adc58acd0b69f77a6ddc764207e97241 before 129643893b79f8a3c6b72045f933fbab5ee424ca |
| Linux / Linux | affected 5.6; unaffected 0 before 5.6; 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/863b6e995665472f2af5be2436a874ab6a9e5ac6
- https://git.kernel.org/stable/c/d18d36395d973ef7372c8e6724970585f75b5c0b
- https://git.kernel.org/stable/c/4415a692346a39fdb647cbd717eda510159aaf55
- https://git.kernel.org/stable/c/9caad13b7cfe9ccb90cc405ac77335800e086595
- https://git.kernel.org/stable/c/e08a3dcaca0505f861e344a387f37f94d95dbdc2
- https://git.kernel.org/stable/c/a4d7fedcaaf33e60a01e53eafca9041ef966212f
- https://git.kernel.org/stable/c/4cdef96892f4fa6e70c405b6e8f2fd6972f3b64b
- https://git.kernel.org/stable/c/129643893b79f8a3c6b72045f933fbab5ee424ca