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CVE-2026-63971

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: sctp: fix race between sctp_wait_for_connect and peeloff sctp_wait_for_connect() drops and re-acquires the socket lock while wa…

Published Jul 19, 2026EPSS 0.13%

Overview

CVE-2026-63971 is a high-severity vulnerability. It was published on July 19, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. 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:

sctp: fix race between sctp_wait_for_connect and peeloff

sctp_wait_for_connect() drops and re-acquires the socket lock while

waiting for the association to reach ESTABLISHED state. During this

window, another thread can peeloff the association to a new socket via

getsockopt(SCTP_SOCKOPT_PEELOFF), changing asoc->base.sk. After

re-acquiring the old socket lock, sctp_wait_for_connect() returns

success without noticing the migration — the caller then accesses

the association under the wrong lock in sctp_datamsg_from_user().

Add the same sk != asoc->base.sk check that sctp_wait_for_sndbuf()

already has, returning an error if the association was migrated while

we slept.

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/0e0d5bc76fd4267a71334fcc8f1a5fbcf997845dRefgit.kernel.org/stable/c/6140cfa721451fa6e18e134e709703c2bf34d0fbRefgit.kernel.org/stable/c/634a9af8a26a84d8b0d7b3b643204b344b42d9fbRefgit.kernel.org/stable/c/68667ee4c7dadf7f63167234e2a1af09b3f7874eRefgit.kernel.org/stable/c/7d2038d4b80166f7bead8d07eba3b97405816c21Refgit.kernel.org/stable/c/8e9b56051d24540cfbf39194618708c4a7633549Refgit.kernel.org/stable/c/bcfeac79af740735ace44008b4a11b8e5add20f5Refgit.kernel.org/stable/c/f14fe6395a8b3d961a61e138ad7b36ba3626dd4e

How CyberStrike helps

Frequently asked questions

What is CVE-2026-63971?

CVE-2026-63971 is a high-severity vulnerability. It was published on July 19, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-63971?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-63971?

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-2026-63971?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-63971 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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