CVE-2025-38724

nfsd: handle get_client_locked() failure in nfsd4_setclientid_confirm()

State: Published
Severity: 9.8 Critical
Published: Sep 4, 2025
Updated: Oct 15, 2026
Reserved: Apr 16, 2025

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().

Scores

CVSS	Score	Vector	Source
3.1	9.8 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	d20c11d86d8f821a64eac7d6c8f296f06d935f4f to before 3f252a73e81aa01660cb426735eab932e6182e8dAffected d20c11d86d8f821a64eac7d6c8f296f06d935f4f to before d35ac850410966010e92f401f4e21868a9ea4d8bAffected d20c11d86d8f821a64eac7d6c8f296f06d935f4f to before f3aac6cf390d8b80e1d82975faf4ac61175519c0Affected d20c11d86d8f821a64eac7d6c8f296f06d935f4f to before 22f45cedf281e6171817c8a3432c44d788c550e1Affected d20c11d86d8f821a64eac7d6c8f296f06d935f4f to before d71abd1ae4e0413707cd42b10c24a11d1aa71772Affected d20c11d86d8f821a64eac7d6c8f296f06d935f4f to before 74ad36ed60df561a303a19ecef400c7096b20306Affected d20c11d86d8f821a64eac7d6c8f296f06d935f4f to before 36e83eda90e0e4ac52f259f775b40b2841f8a0a3Affected d20c11d86d8f821a64eac7d6c8f296f06d935f4f to before 571a5e46c71490285d2d8c06f6b5a7cbf6c7edd1Affected d20c11d86d8f821a64eac7d6c8f296f06d935f4f to before 908e4ead7f757504d8b345452730636e298cbf68Affected
LinuxLinux	3.17Affected before 3.17Not affected 5.4.297 through 5.4.Not affected 5.10.241 through 5.10.Not affected 5.15.190 through 5.15.Not affected 6.1.149 through 6.1.Not affected 6.6.103 through 6.6.Not affected 6.12.43 through 6.12.Not affected 6.15.11 through 6.15.Not affected 6.16.2 through 6.16.Not affected 6.17 and laterNot affected

Product

Versions

LinuxLinux

d20c11d86d8f821a64eac7d6c8f296f06d935f4f to before 3f252a73e81aa01660cb426735eab932e6182e8dAffected
d20c11d86d8f821a64eac7d6c8f296f06d935f4f to before d35ac850410966010e92f401f4e21868a9ea4d8bAffected
d20c11d86d8f821a64eac7d6c8f296f06d935f4f to before f3aac6cf390d8b80e1d82975faf4ac61175519c0Affected
d20c11d86d8f821a64eac7d6c8f296f06d935f4f to before 22f45cedf281e6171817c8a3432c44d788c550e1Affected
d20c11d86d8f821a64eac7d6c8f296f06d935f4f to before d71abd1ae4e0413707cd42b10c24a11d1aa71772Affected
d20c11d86d8f821a64eac7d6c8f296f06d935f4f to before 74ad36ed60df561a303a19ecef400c7096b20306Affected
d20c11d86d8f821a64eac7d6c8f296f06d935f4f to before 36e83eda90e0e4ac52f259f775b40b2841f8a0a3Affected
d20c11d86d8f821a64eac7d6c8f296f06d935f4f to before 571a5e46c71490285d2d8c06f6b5a7cbf6c7edd1Affected
d20c11d86d8f821a64eac7d6c8f296f06d935f4f to before 908e4ead7f757504d8b345452730636e298cbf68Affected

LinuxLinux

3.17Affected
before 3.17Not affected
5.4.297 through 5.4.*Not affected
5.10.241 through 5.10.*Not affected
5.15.190 through 5.15.*Not affected
6.1.149 through 6.1.*Not affected
6.6.103 through 6.6.*Not affected
6.12.43 through 6.12.*Not affected
6.15.11 through 6.15.*Not affected
6.16.2 through 6.16.*Not affected
6.17 and laterNot affected

References

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