CVE-2022-50241
HighCVSS 8.8Exploitation Probability (EPSS)
Low risk27th percentile - higher than 27% of all known CVEs
Summary
In the Linux kernel's NFSD module, a use-after-free was found during inter-server copy operations. The issue occurs when copy state (cpntf_state) is freed before being removed from the list, leading to UAF when the cleanup process tries to free it.
Risk Assessment
The vulnerability could lead to a system crash or potentially privilege escalation in NFS environments, especially during inter-server copy operations.
Recommendation
It is recommended to update the Linux kernel to a version with the fix that adds a call to nfs4_free_cpntf_statelist in nfsd4_close_open_stateid to clean up copy state before freeing.
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Original NVD description (English source)
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.