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CVE-2026-43106

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: cachefiles: fix incorrect dentry refcount in cachefiles_cull() The patch mentioned below changed cachefiles_bury_object() to ex…

Published May 6, 2026EPSS 0.17%

Overview

CVE-2026-43106 is a high-severity vulnerability. It was published on May 6, 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:

cachefiles: fix incorrect dentry refcount in cachefiles_cull()

The patch mentioned below changed cachefiles_bury_object() to expect 2

references to the 'rep' dentry. Three of the callers were changed to

use start_removing_dentry() which takes an extra reference so in those

cases the call gets the expected references.

However there is another call to cachefiles_bury_object() in

cachefiles_cull() which did not need to be changed to use

start_removing_dentry() and so was not properly considered.

It still passed the dentry with just one reference so the net result is

that a reference is lost.

To meet the expectations of cachefiles_bury_object(), cachefiles_cull()

must take an extra reference before the call. It will be dropped by

cachefiles_bury_object().

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/1635c2acdde86c4f555b627aec873c8677c421edRefgit.kernel.org/stable/c/6577df7dc7a7de128442b6192c7a32195c923480

How CyberStrike helps

Frequently asked questions

What is CVE-2026-43106?

CVE-2026-43106 is a high-severity vulnerability. It was published on May 6, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-43106?

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-2026-43106?

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-2026-43106?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-43106 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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