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CVE-2026-53238

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: netlabel: validate unlabeled address and mask attribute lengths netlbl_unlabel_addrinfo_get() used the address attribute length…

Published Jun 25, 2026EPSS 0.12%

Overview

CVE-2026-53238 is a medium-severity vulnerability. It was published on June 25, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. 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:

netlabel: validate unlabeled address and mask attribute lengths

netlbl_unlabel_addrinfo_get() used the address attribute length to

determine whether the attribute data could be read as an IPv4 or IPv6

address, but did not independently validate the corresponding mask

attribute length. A crafted Generic Netlink request could therefore

provide a valid IPv4/IPv6 address attribute with a shorter mask

attribute, which would later be read as a full struct in_addr or

struct in6_addr.

NLA_BINARY policy lengths are maximum lengths by default, so use

NLA_POLICY_EXACT_LEN() for the unlabeled IPv4/IPv6 address and mask

attributes. This rejects short attributes during policy validation and

also exposes the exact length requirements through policy introspection.

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/07a18f5c90dd3d586b73242f5a5bbf0a72f2fdc6Refgit.kernel.org/stable/c/0c4bb32ad7fdc2dc6a8050f41eb04d4bda56b6c8Refgit.kernel.org/stable/c/672f0f3b8f875ffe6525a37847eafa7648c4c0c6Refgit.kernel.org/stable/c/71c52da13c3737493b42d20d9f33de34e03b3156Refgit.kernel.org/stable/c/95bda3eac0b1454c2cee98d58d9ba6dd8391e843Refgit.kernel.org/stable/c/975a84fd741440853380d37465b6e226cf47254cRefgit.kernel.org/stable/c/9772589b57e44aedc240211c5c3f7a684a034d3aRefgit.kernel.org/stable/c/ccfe292a966079c61ea68a2da303b2a336170993

How CyberStrike helps

Frequently asked questions

What is CVE-2026-53238?

CVE-2026-53238 is a medium-severity vulnerability. It was published on June 25, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-53238?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-53238?

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-2026-53238?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-53238 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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