Bug 2360291 (CVE-2025-22039)

Summary: CVE-2025-22039 kernel: ksmbd: fix overflow in dacloffset bounds check
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: low    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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Description OSIDB Bzimport 2025-04-16 15:06:40 UTC 
In the Linux kernel, the following vulnerability has been resolved:

ksmbd: fix overflow in dacloffset bounds check

The dacloffset field was originally typed as int and used in an
unchecked addition, which could overflow and bypass the existing
bounds check in both smb_check_perm_dacl() and smb_inherit_dacl().

This could result in out-of-bounds memory access and a kernel crash
when dereferencing the DACL pointer.

This patch converts dacloffset to unsigned int and uses
check_add_overflow() to validate access to the DACL.
Comment 1 Avinash Hanwate 2025-04-17 06:15:51 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025041659-CVE-2025-22039-2a63@gregkh/T