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CVE-2026-46170

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: mptcp: pm: ADD_ADDR rtx: free sk if last When an ADD_ADDR is retransmitted, the sk is held in sk_reset_timer(), and released at…

Published May 28, 2026EPSS 0.13%

Overview

CVE-2026-46170 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: free sk if last

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

and released at the end.

If at that moment, it was the last reference being held, the sk would

not be freed. sock_put() should then be called instead of __sock_put().

But that's not enough: if it is the last reference, sock_put() will call

sk_free(), which will end up calling sk_stop_timer_sync() on the same

timer, and waiting indefinitely to finish. So it is needed to mark that

the timer is done at the end of the timer handler when it has not been

rescheduled, not to call sk_stop_timer_sync() on "itself".

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/1f26487e83e69462540bb1047139472957c913c6Refgit.kernel.org/stable/c/531c537b8fb620beabccfb1594e8d43cbebbb87aRefgit.kernel.org/stable/c/5da972efed3dc7599da6e2b5e8d906d1b7b1a728Refgit.kernel.org/stable/c/6a3af482188f6db4186d1605f64d911d7330abb3Refgit.kernel.org/stable/c/8143a224785ceaf2b0856e08d4498916f38228fbRefgit.kernel.org/stable/c/b74ad20198652b6b39a761c277ba65ae82b1e107Refgit.kernel.org/stable/c/b7b9a461569734d33d3259d58d2507adfac107ed

How CyberStrike helps

Frequently asked questions

What is CVE-2026-46170?

CVE-2026-46170 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-2026-46170?

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-2026-46170?

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-2026-46170?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-46170 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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