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CVE-2026-46158

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: mptcp: pm: ADD_ADDR rtx: always decrease sk refcount When an ADD_ADDR is retransmitted, the sk is held in sk_reset_timer().

Published May 28, 2026EPSS 0.13%

Overview

CVE-2026-46158 is a medium-severity vulnerability. It was published on May 28, 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:

mptcp: pm: ADD_ADDR rtx: always decrease sk refcount

When an ADD_ADDR is retransmitted, the sk is held in sk_reset_timer().

It should then be released in all cases at the end.

Some (unlikely) checks were returning directly instead of calling

sock_put() to decrease the refcount. Jump to a new 'exit' label to call

__sock_put() (which will become sock_put() in the next commit) to fix

this potential leak.

While at it, drop the '!msk' check which cannot happen because it is

never reset, and explicitly mark the remaining one as "unlikely".

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/25e37407442b8766ec2cf52fb4e31b5c3d3aeeaeRefgit.kernel.org/stable/c/81d8142148164176385c279c7c1e1d581867423dRefgit.kernel.org/stable/c/9426265e157dd77ec237c795901ed4dea6d69b5cRefgit.kernel.org/stable/c/9634cb35af17019baec21ca648516ce376fa10e6Refgit.kernel.org/stable/c/acd3d3562315c99f3c0db16f0fcc5f0306638982Refgit.kernel.org/stable/c/b41dd76f3b9735096c21d3e799a2b9fe36498d57Refgit.kernel.org/stable/c/e9ba34301d2e90f63f97c76ad9eb98e5250fe961

How CyberStrike helps

Frequently asked questions

What is CVE-2026-46158?

CVE-2026-46158 is a medium-severity vulnerability. It was published on May 28, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-46158?

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-2026-46158?

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-2026-46158?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-46158 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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