Description
In the Linux kernel, the following vulnerability has been resolved: nfsd: handle get_client_locked() failure in nfsd4_setclientid_confirm() Lei Lu recently reported that nfsd4_setclientid_confirm() did not check the return value from get_client_locked(). a SETCLIENTID_CONFIRM could race with a confirmed client expiring and fail to get a reference. That could later lead to a UAF. Fix this by getting a reference early in the case where there is an extant confirmed client. If that fails then treat it as if there were no confirmed client found at all. In the case where the unconfirmed client is expiring, just fail and return the result from get_client_locked().
Affected products
linux: linux kernel; debian: debian linux
References10
- git.kernel.org/stable/c/22f45cedf281e6171817c8a3432c44d788c550e1 Patch
- git.kernel.org/stable/c/36e83eda90e0e4ac52f259f775b40b2841f8a0a3 Patch
- git.kernel.org/stable/c/3f252a73e81aa01660cb426735eab932e6182e8d Patch
- git.kernel.org/stable/c/571a5e46c71490285d2d8c06f6b5a7cbf6c7edd1 Patch
- git.kernel.org/stable/c/74ad36ed60df561a303a19ecef400c7096b20306 Patch
- git.kernel.org/stable/c/908e4ead7f757504d8b345452730636e298cbf68 Patch
- git.kernel.org/stable/c/d35ac850410966010e92f401f4e21868a9ea4d8b Patch
- git.kernel.org/stable/c/d71abd1ae4e0413707cd42b10c24a11d1aa71772 Patch
- git.kernel.org/stable/c/f3aac6cf390d8b80e1d82975faf4ac61175519c0 Patch
- lists.debian.org/debian-lts-announce/2025/10/msg00007.html Mailing ListThird Party Advisory
Metrics
- CVSS 3.1
-
7.8
HIGH
Score source: NVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 0% percentile: 35 · as of 8 November 2026
- CWE
- CWE-416
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.