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CVE-2026-63971

HIGHCVSS 7.8/10EPSS 0.16%

Last modified

CVE-2026-63971 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. 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. EPSS estimates a 0.16% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
7.8/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability
0.16%

6.0th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 668c9beb9020d5834ee9e43c208190a07d2b1928, < 0e0d5bc76fd4267a71334fcc8f1a5fbcf997845d; >= 668c9beb9020d5834ee9e43c208190a07d2b1928, < bcfeac79af740735ace44008b4a11b8e5add20f5; >= 668c9beb9020d5834ee9e43c208190a07d2b1928, < 8e9b56051d24540cfbf39194618708c4a7633549; >= 668c9beb9020d5834ee9e43c208190a07d2b1928, < 634a9af8a26a84d8b0d7b3b643204b344b42d9fb; >= 668c9beb9020d5834ee9e43c208190a07d2b1928, < 7d2038d4b80166f7bead8d07eba3b97405816c21; >= 668c9beb9020d5834ee9e43c208190a07d2b1928, < 68667ee4c7dadf7f63167234e2a1af09b3f7874e; >= 668c9beb9020d5834ee9e43c208190a07d2b1928, < 6140cfa721451fa6e18e134e709703c2bf34d0fb; >= 668c9beb9020d5834ee9e43c208190a07d2b1928, < f14fe6395a8b3d961a61e138ad7b36ba3626dd4e
LinuxLinux4.16

References

Timeline

Published
Last Modified
Status
Awaiting Analysis

Frequently Asked Questions

What is CVE-2026-63971?
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.
How severe is CVE-2026-63971?
CVE-2026-63971 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.16% probability of exploitation in the next 30 days.
How do I fix CVE-2026-63971?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST