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CVE-2026-53236

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: tcp: restrict SO_ATTACH_FILTER to priv users This patch restricts the use of SO_ATTACH_FILTER (cBPF) on TCP sockets to users wi…

Published Jun 25, 2026EPSS 0.13%

Overview

CVE-2026-53236 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:

tcp: restrict SO_ATTACH_FILTER to priv users

This patch restricts the use of SO_ATTACH_FILTER (cBPF) on TCP sockets

to users with CAP_NET_ADMIN capability.

This blocks potential side-channel attack where an unprivileged application

attaches a filter to leak TCP sequence/acknowledgment numbers.

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/3747de241a66ef2c7032d2cc2b826a47c5fa0f6aRefgit.kernel.org/stable/c/5d39580f68e6ddeedd15e587282207489dfb3da2Refgit.kernel.org/stable/c/82b3e7ce10c53fc12aab8904745603efc74f8c07Refgit.kernel.org/stable/c/c68517a3e18e20997808821c5559d0cba4d776c1Refgit.kernel.org/stable/c/ecfe9171b26ae3eed0cd8bab7a943e9e2c9e51baRefgit.kernel.org/stable/c/ede69b8f6670600e534591664584f810d7c385f9

How CyberStrike helps

Frequently asked questions

What is CVE-2026-53236?

CVE-2026-53236 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-2026-53236?

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-2026-53236?

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-2026-53236?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-53236 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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