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CVE-2026-53227

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: net: openvswitch: fix possible kfree_skb of ERR_PTR After the patch in the "Fixes" tag, the allocation of the "reply" skb can h…

Published Jun 25, 2026CWE-401EPSS 0.13%

Overview

CVE-2026-53227 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:

net: openvswitch: fix possible kfree_skb of ERR_PTR

After the patch in the "Fixes" tag, the allocation of the "reply" skb

can happen either before or after locking the ovs_mutex.

However, error cleanups still follow the classical reversed order,

assuming "reply" is allocated before locking: it is freed after unlocking.

If "reply" allocation happens after locking the mutex and it fails,

"reply" is left with an ERR_PTR, and execution jumps to the correspondent

cleanup stage which will try to free an invalid pointer.

Fix this by setting the pointer to NULL after having saved its error

value.

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/0bb5b2dc1b90aa7dd1473fc8c4d813a29255ff8dRefgit.kernel.org/stable/c/25fdf53698535fe8790237f5a8a9626791429785Refgit.kernel.org/stable/c/895d1dd9057cde1687fa0f4286d47ceed0b82997Refgit.kernel.org/stable/c/971b1b37774f13acc5add0a2843f8598446b8598Refgit.kernel.org/stable/c/e248fb2e680deb2bd37bac551b72638fe4938a76Refgit.kernel.org/stable/c/e3d509a1b71396e1452060dbf84a805fd1c3c549Refgit.kernel.org/stable/c/ecc55aad3390129a87106841f4b68bf3d70c9264Refgit.kernel.org/stable/c/ee30dd2909d8b98619f4341c70ec8dc8e155ab02

How CyberStrike helps

Frequently asked questions

What is CVE-2026-53227?

CVE-2026-53227 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-2026-53227?

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-2026-53227?

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-2026-53227?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-53227 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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