CVE-2022-50241 (GCVE-0-2022-50241)
Vulnerability from cvelistv5
Published
2025-09-15 14:01
Modified
2026-10-15 21:31
Severity ?
8.8 (High) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: NFSD: fix use-after-free on source server when doing inter-server copy Use-after-free occurred when the laundromat tried to free expired cpntf_state entry on the s2s_cp_stateids list after inter-server copy completed. The sc_cp_list that the expired copy state was inserted on was already freed. When COPY completes, the Linux client normally sends LOCKU(lock_state x), FREE_STATEID(lock_state x) and CLOSE(open_state y) to the source server. The nfs4_put_stid call from nfsd4_free_stateid cleans up the copy state from the s2s_cp_stateids list before freeing the lock state's stid. However, sometimes the CLOSE was sent before the FREE_STATEID request. When this happens, the nfsd4_close_open_stateid call from nfsd4_close frees all lock states on its st_locks list without cleaning up the copy state on the sc_cp_list list. When the time the FREE_STATEID arrives the server returns BAD_STATEID since the lock state was freed. This causes the use-after-free error to occur when the laundromat tries to free the expired cpntf_state. This patch adds a call to nfs4_free_cpntf_statelist in nfsd4_close_open_stateid to clean up the copy state before calling free_ol_stateid_reaplist to free the lock state's stid on the reaplist.
References
Impacted products
Vendor Product Version
Linux Linux Version: 624322f1adc58acd0b69f77a6ddc764207e97241
Version: 624322f1adc58acd0b69f77a6ddc764207e97241
Version: 624322f1adc58acd0b69f77a6ddc764207e97241
Version: 624322f1adc58acd0b69f77a6ddc764207e97241
Version: 624322f1adc58acd0b69f77a6ddc764207e97241
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