CVE-2025-38191
HIGH severity · CVSS 7.5 · CWE-476
7.5CVSS HIGH
Summary
In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix null pointer dereference in destroy_previous_session If client set ->PreviousSessionId on kerberos session setup stage, NULL pointer dereference error will happen. Since sess->user is not set yet, It can pass the user argument as NULL to destroy_previous_session. sess->user will be set in ksmbd_krb5_authenticate(). So this patch move calling destroy_previous_session() after ksmbd_krb5_authenticate().
Impact & exploitability
Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
Confidentiality impactNone
Integrity impactNone
Availability impactHigh
Exploit probability (EPSS)0%
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products we track (2)
Recommendation
Apply the vendor fix promptly. Open any affected product above for its exact safe version.
Official patch: https://git.kernel.org/stable/c/076f1adefb9837977af7ed233883842ddc446644 ↗
Additional information
- NVD record
- https://git.kernel.org/stable/c/076f1adefb9837977af7ed233883842ddc446644Patch
- https://git.kernel.org/stable/c/0902625a24eea7fdc187faa5d97df244d159dd6ePatch
- https://git.kernel.org/stable/c/1193486dffb7432a09f57f5d09049b4d4123538bPatch
- https://git.kernel.org/stable/c/281afc52e2961cd5dd8326ebc9c5bc40904c0468Patch
- https://git.kernel.org/stable/c/7ac5b66acafcc9292fb935d7e03790f2b8b2dc0ePatch
- https://www.zerodayinitiative.com/advisories/ZDI-25-610/Advisory
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.htmlAdvisory