Bug 2389513 (CVE-2025-38562)

Summary: CVE-2025-38562 kernel: ksmbd: fix null pointer dereference error in generate_encryptionkey
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerability-draftAssignee: Product Security DevOps Team <prodsec-dev>
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Version: unspecifiedKeywords: Security
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OS: Linux   
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Description OSIDB Bzimport 2025-08-19 18:05:03 UTC 
In the Linux kernel, the following vulnerability has been resolved:

ksmbd: fix null pointer dereference error in generate_encryptionkey

If client send two session setups with krb5 authenticate to ksmbd,
null pointer dereference error in generate_encryptionkey could happen.
sess->Preauth_HashValue is set to NULL if session is valid.
So this patch skip generate encryption key if session is valid.
Comment 1 Jon Moroney 2025-08-19 20:49:54 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025081907-CVE-2025-38562-1418@gregkh/T