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>
Status: NEW --- QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A race condition was found in the Linux kernel's filesystem mount namespace handling. When cleaning up peer group IDs in an error path, the code fails to hold the namespace lock. This allows another thread to concurrently change a mount from shared to non-shared, potentially causing inconsistent mount propagation state or other undefined behavior.
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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