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
Configurations
Configuration 1 (hide)
|
History
25 Nov 2025, 14:42
| Type | Values Removed | Values Added |
|---|---|---|
| CWE | CWE-416 | |
| First Time |
Linux linux Kernel
Linux |
|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 7.8 |
| CPE | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | |
| References | () https://git.kernel.org/stable/c/019805fea91599b22dfa62ffb29c022f35abeb06 - Patch | |
| References | () https://git.kernel.org/stable/c/35aa0fb8c3033a3d78603356e96fc18c5b9cceb2 - Patch | |
| References | () https://git.kernel.org/stable/c/6ea71246b7a02af675d733e72d14bd0d591d5f4a - Patch | |
| References | () https://git.kernel.org/stable/c/83b94969751a691347606dbe6b1865efcfa5a643 - Patch | |
| References | () https://git.kernel.org/stable/c/bbacfcde5fff25ac22597e8373a065c647da6738 - Patch |
Information
Published : 2025-09-15 14:15
Updated : 2025-11-25 14:42
NVD link : CVE-2022-50241
Mitre link : CVE-2022-50241
CVE.ORG link : CVE-2022-50241
JSON object : View
Products Affected
linux
- linux_kernel
CWE
CWE-416
Use After Free