Bug 2356623 (CVE-2025-21955)

Summary: CVE-2025-21955 kernel: ksmbd: prevent connection release during oplock break notification
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2025-04-01 16:03:04 UTC 
In the Linux kernel, the following vulnerability has been resolved:

ksmbd: prevent connection release during oplock break notification

ksmbd_work could be freed when after connection release.
Increment r_count of ksmbd_conn to indicate that requests
are not finished yet and to not release the connection.
Comment 1 Robb Gatica 2025-04-02 02:41:06 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025040143-CVE-2025-21955-c393@gregkh/T