Description
In the Linux kernel, the following vulnerability has been resolved: NFSD: Prevent NULL dereference in nfsd4_process_cb_update() @ses is initialized to NULL. If __nfsd4_find_backchannel() finds no available backchannel session, setup_callback_client() will try to dereference @ses and segfault.
Affected products
linux: linux kernel
References10
- git.kernel.org/stable/c/03178cd8f67227015debb700123987fe96275cd1 Patch
- git.kernel.org/stable/c/0c3b0e326f838787d229314d4de83af9c53347e8 Patch
- git.kernel.org/stable/c/1e02c641c3a43c88cecc08402000418e15578d38 Patch
- git.kernel.org/stable/c/4a4ffc1aa9d618e41ad9151f40966e402e58a5a2 Patch
- git.kernel.org/stable/c/752a75811f27300fe8131b0a1efc91960f6f88e7 Patch
- git.kernel.org/stable/c/c5d90f9302742985a5078e42ac38de42c364c44a Patch
- git.kernel.org/stable/c/cac1405e3ff6685a438e910ad719e0cf06af90ee Patch
- git.kernel.org/stable/c/d9a0d1f6e15859ea7a86a327f28491e23deaaa62 Patch
- git.kernel.org/stable/c/eb51733ae5fc73d95bd857d5da26f9f65b202a79 Patch
- lists.debian.org/debian-lts-announce/2025/03/msg00001.html
Metrics
- CVSS 3.1
-
5.5
MEDIUM
Score source: NVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - EPSS — exploit probability
- 1% percentile: 54 · as of 6 November 2026
- CWE
- CWE-476
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.