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CVE-2026-52928

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: af_unix: Reject SIOCATMARK on non-stream sockets SIOCATMARK reports whether the receive queue is at the urgent mark for MSG_OOB.

Published Jun 24, 2026EPSS 0.11%

Overview

CVE-2026-52928 is a medium-severity vulnerability. It was published on June 24, 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:

af_unix: Reject SIOCATMARK on non-stream sockets

SIOCATMARK reports whether the receive queue is at the urgent mark for

MSG_OOB.

In AF_UNIX, MSG_OOB is supported only for SOCK_STREAM sockets.

SOCK_DGRAM and SOCK_SEQPACKET reject MSG_OOB in sendmsg() and recvmsg(),

so they should not support SIOCATMARK either.

Return -EOPNOTSUPP for non-stream sockets before checking the receive

queue.

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/3147ddf5a41c20c45c2eb69e00b62f10f822056aRefgit.kernel.org/stable/c/645b1ed3259af38b7814242a420bc2081bdd1eb6Refgit.kernel.org/stable/c/b741c9c6ef59f17c1f104ddf1217ef77f79ed29bRefgit.kernel.org/stable/c/c34c41446acf6c0d13b5b06c809be11e0f7f2729Refgit.kernel.org/stable/c/d119775f2bad827edc28071c061fdd4a91f889a5Refgit.kernel.org/stable/c/ec123873fdc83e7244c8ed6d17b8f8ea6c416a67Refgit.kernel.org/stable/c/f085971de6d6b8ef946a5e0bcd73ff24509a0f85

How CyberStrike helps

Frequently asked questions

What is CVE-2026-52928?

CVE-2026-52928 is a medium-severity vulnerability. It was published on June 24, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-52928?

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-2026-52928?

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-2026-52928?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-52928 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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