Bug 2356674 (CVE-2025-21944)

Summary: CVE-2025-21944 kernel: ksmbd: fix bug on trap in smb2_lock
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 2025-04-01 16:05:27 UTC 
In the Linux kernel, the following vulnerability has been resolved:

ksmbd: fix bug on trap in smb2_lock

If lock count is greater than 1, flags could be old value.
It should be checked with flags of smb_lock, not flags.
It will cause bug-on trap from locks_free_lock in error handling
routine.
Comment 1 Robb Gatica 2025-04-01 22:58:42 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025040135-CVE-2025-21944-d6eb@gregkh/T