Bug 2424984 (CVE-2023-53867)

Summary: CVE-2023-53867 kernel: ceph: fix potential use-after-free bug when trimming caps
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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OS: Linux   
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Description OSIDB Bzimport 2025-12-24 12:05:54 UTC 
In the Linux kernel, the following vulnerability has been resolved:

ceph: fix potential use-after-free bug when trimming caps

When trimming the caps and just after the 'session->s_cap_lock' is
released in ceph_iterate_session_caps() the cap maybe removed by
another thread, and when using the stale cap memory in the callbacks
it will trigger use-after-free crash.

We need to check the existence of the cap just after the 'ci->i_ceph_lock'
being acquired. And do nothing if it's already removed.
Comment 1 Alexander B 2025-12-25 10:59:28 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025122422-CVE-2023-53867-cb3e@gregkh/T