Bug 2360242 (CVE-2025-22040)

Summary: CVE-2025-22040 kernel: ksmbd: fix session use-after-free in multichannel connection
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
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Hardware: All   
OS: Linux   
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Description OSIDB Bzimport 2025-04-16 15:04:17 UTC 
In the Linux kernel, the following vulnerability has been resolved:

ksmbd: fix session use-after-free in multichannel connection

There is a race condition between session setup and
ksmbd_sessions_deregister. The session can be freed before the connection
is added to channel list of session.
This patch check reference count of session before freeing it.
Comment 1 Avinash Hanwate 2025-04-17 11:09:51 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025041659-CVE-2025-22040-27ed@gregkh/T