Description
In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free in kerberos authentication Setting sess->user = NULL was introduced to fix the dangling pointer created by ksmbd_free_user. However, it is possible another thread could be operating on the session and make use of sess->user after it has been passed to ksmbd_free_user but before sess->user is set to NULL.
Affected products
linux: linux kernel; debian: debian linux
References6
- git.kernel.org/stable/c/28c756738af44a404a91b77830d017bb0c525890 Patch
- git.kernel.org/stable/c/b447463562238428503cfba1c913261047772f90 Patch
- git.kernel.org/stable/c/e18c616718018dfc440e4a2d2b94e28fe91b1861 Patch
- git.kernel.org/stable/c/e34a33d5d7e87399af0a138bb32f6a3e95dd83d2 Patch
- git.kernel.org/stable/c/e86e9134e1d1c90a960dd57f59ce574d27b9a124 Patch
- lists.debian.org/debian-lts-announce/2025/08/msg00010.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
- 25% percentile: 98 · as of 7 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.