CVE-2023-53867
Unknown Unknown - Not Provided
Use-After-Free Vulnerability in Linux Kernel Ceph Caps Handling

Publication date: 2025-12-24

Last updated on: 2025-12-24

Assigner: kernel.org

Description
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.
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Meta Information
Published
2025-12-24
Last Modified
2025-12-24
Generated
2026-06-16
AI Q&A
2025-12-24
EPSS Evaluated
2026-06-15
NVD
CVE-2023-53867
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
ceph ceph *
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Exploitability
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CWE ID Description
CWE-UNKNOWN
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Executive Summary

This vulnerability is a use-after-free bug in the Linux kernel's Ceph component. It occurs when trimming caps in the function ceph_iterate_session_caps(). After releasing the session's s_cap_lock, another thread may remove the cap, leading to the use of stale memory in callbacks, which can cause a crash. The fix involves checking if the cap still exists after acquiring the i_ceph_lock and doing nothing if the cap has already been removed.

Impact Analysis

This vulnerability can cause a use-after-free crash in the Ceph component of the Linux kernel, potentially leading to system instability or denial of service if exploited.

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