Bug 2360240 (CVE-2025-22038)

Summary: CVE-2025-22038 kernel: ksmbd: validate zero num_subauth before sub_auth is accessed
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: high    
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 15:04:14 UTC 
In the Linux kernel, the following vulnerability has been resolved:

ksmbd: validate zero num_subauth before sub_auth is accessed

Access psid->sub_auth[psid->num_subauth - 1] without checking
if num_subauth is non-zero leads to an out-of-bounds read.
This patch adds a validation step to ensure num_subauth != 0
before sub_auth is accessed.
Comment 1 Avinash Hanwate 2025-04-17 11:23:03 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025041659-CVE-2025-22038-1b5a@gregkh/T