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CVE-2026-53174

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: ovl: keep err zero after successful ovl_cache_get() ovl_iterate_merged() stores PTR_ERR(cache) in err before checking IS_ERR(ca…

Published Jun 25, 2026EPSS 0.17%

Overview

CVE-2026-53174 is a high-severity vulnerability. It was published on June 25, 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:

ovl: keep err zero after successful ovl_cache_get()

ovl_iterate_merged() stores PTR_ERR(cache) in err before checking

IS_ERR(cache). On success err holds the truncated cache pointer and

can be returned as a bogus non-zero error.

The syzbot reproducer reaches this through overlay-on-overlay readdir:

getdents64

iterate_dir(outer overlay file)

ovl_iterate_merged()

ovl_cache_get()

ovl_dir_read_merged()

ovl_dir_read()

iterate_dir(inner overlay file)

ovl_iterate_merged()

Only compute PTR_ERR(cache) on the error path.

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/1711b6ed6953cee5940ca4c3a6e77f1b3798cee2Refgit.kernel.org/stable/c/e7051909a01bfb883bfa78b27514854068ac4b85

How CyberStrike helps

Frequently asked questions

What is CVE-2026-53174?

CVE-2026-53174 is a high-severity vulnerability. It was published on June 25, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-53174?

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-2026-53174?

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-2026-53174?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-53174 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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