Bug 2376401 (CVE-2025-38191)

Summary: CVE-2025-38191 kernel: ksmbd: fix null pointer dereference in destroy_previous_session
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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OS: Linux   
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Description OSIDB Bzimport 2025-07-04 14:04:01 UTC 
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().
Comment 1 Mauro Matteo Cascella 2025-07-04 19:43:36 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025070414-CVE-2025-38191-ee47@gregkh/T