Bug 2425104 (CVE-2023-54128)

Summary: CVE-2023-54128 kernel: fs: drop peer group ids under namespace lock
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Version: unspecifiedKeywords: Security
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OS: Linux   
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Description OSIDB Bzimport 2025-12-24 14:03:13 UTC 
In the Linux kernel, the following vulnerability has been resolved:

fs: drop peer group ids under namespace lock

When cleaning up peer group ids in the failure path we need to make sure
to hold on to the namespace lock. Otherwise another thread might just
turn the mount from a shared into a non-shared mount concurrently.
Comment 1 Alexander B 2025-12-25 02:21:04 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025122419-CVE-2023-54128-a164@gregkh/T