Bug 2356631 (CVE-2025-21946)

Summary: CVE-2025-21946 kernel: ksmbd: fix out-of-bounds in parse_sec_desc()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: low    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
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Hardware: All   
OS: Linux   
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Description OSIDB Bzimport 2025-04-01 16:03:29 UTC 
In the Linux kernel, the following vulnerability has been resolved:

ksmbd: fix out-of-bounds in parse_sec_desc()

If osidoffset, gsidoffset and dacloffset could be greater than smb_ntsd
struct size. If it is smaller, It could cause slab-out-of-bounds.
And when validating sid, It need to check it included subauth array size.
Comment 1 Robb Gatica 2025-04-02 02:02:41 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025040136-CVE-2025-21946-63a2@gregkh/T