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CVE-2026-53129

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: fs/mbcache: cancel shrink work before destroying the cache mb_cache_destroy() calls shrinker_free() and then frees all cache en…

Published Jun 24, 2026CWE-416EPSS 0.12%

Overview

CVE-2026-53129 is a high-severity vulnerability. It was published on June 24, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

fs/mbcache: cancel shrink work before destroying the cache

mb_cache_destroy() calls shrinker_free() and then frees all cache

entries and the cache itself, but it does not cancel the pending

c_shrink_work work item first.

If mb_cache_entry_create() schedules c_shrink_work via schedule_work()

and the work item is still pending or running when mb_cache_destroy()

runs, mb_cache_shrink_worker() will access the cache after its memory

has been freed, causing a use-after-free.

This is only reachable by a privileged user (root or CAP_SYS_ADMIN)

who can trigger the last put of a mounted ext2/ext4/ocfs2 filesystem.

Cancel the work item with cancel_work_sync() before calling

shrinker_free(), ensuring the worker has finished and will not be

rescheduled before the cache is torn down.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/0e4eff315d799f5842b95872199b0f0fb8ef5f51Refgit.kernel.org/stable/c/a88d39a74a208e197c03bffaa2df34de732af19fRefgit.kernel.org/stable/c/b25fd3523bef88fb7ffd4c5b63bbe9c08f73bb4cRefgit.kernel.org/stable/c/d227786ab1119669df4dc333a61510c52047cce4

How CyberStrike helps

Frequently asked questions

What is CVE-2026-53129?

CVE-2026-53129 is a high-severity vulnerability. It was published on June 24, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-53129?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-53129?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-53129?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-53129 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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