Bug 2414722 (CVE-2025-40195)

Summary: CVE-2025-40195 kernel: Linux kernel: NULL pointer dereference in mount leads to local denial of service
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in kernel. This vulnerability allows local denial-of-service via a NULL pointer dereference in pid_nr_ns() when called with a NULL PID namespace.
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Description OSIDB Bzimport 2025-11-12 23:02:33 UTC 
In the Linux kernel, the following vulnerability has been resolved:

mount: handle NULL values in mnt_ns_release()

When calling in listmount() mnt_ns_release() may be passed a NULL
pointer. Handle that case gracefully.
Comment 1 Alexander B 2025-11-13 11:26:15 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025111245-CVE-2025-40195-f91e@gregkh/T