High 7.8Published Jul 19, 2026

CVE-2026-63971sctp: fix race between sctp_wait_for_connect and peeloff

Updated under an hour ago (Oct 28, 2026, 7:23 AM ET)

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Exploited in the last 30 days

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.

CVSS: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-362
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	668c9beb9020d5834ee9e43c208190a07d2b1928 builds before 0e0d5bc76fd4267a71334fcc8f1a5fbcf997845d; from 668c9beb9020d5834ee9e43c208190a07d2b1928 before bcfeac79af740735ace44008b4a11b8e5add20f5; 668c9beb9020d5834ee9e43c208190a07d2b1928 builds before 8e9b56051d24540cfbf39194618708c4a7633549; 668c9beb9020d5834ee9e43c208190a07d2b1928 builds before 634a9af8a26a84d8b0d7b3b643204b344b42d9fb; 668c9beb9020d5834ee9e43c208190a07d2b1928 builds before 7d2038d4b80166f7bead8d07eba3b97405816c21; from 668c9beb9020d5834ee9e43c208190a07d2b1928 before 68667ee4c7dadf7f63167234e2a1af09b3f7874e; from 668c9beb9020d5834ee9e43c208190a07d2b1928 before 6140cfa721451fa6e18e134e709703c2bf34d0fb; from 668c9beb9020d5834ee9e43c208190a07d2b1928 before f14fe6395a8b3d961a61e138ad7b36ba3626dd4e	CNA record
linux linux_kernel linux:linux_kernel	from 4.16 before 5.10.259; from 5.11 before 5.15.210; from 5.16 before 6.1.176; from 6.2 before 6.6.143; from 6.7 before 6.12.93; from 6.13 before 6.18.35; from 6.19 before 7.0.12; 7.1; and 4 more ranges	NVD

References

References

https://git.kernel.org/stable/c/0e0d5bc76fd4267a71334fcc8f1a5fbcf997845d	patch
https://git.kernel.org/stable/c/bcfeac79af740735ace44008b4a11b8e5add20f5	patch
https://git.kernel.org/stable/c/8e9b56051d24540cfbf39194618708c4a7633549	patch
https://git.kernel.org/stable/c/634a9af8a26a84d8b0d7b3b643204b344b42d9fb	patch
https://git.kernel.org/stable/c/7d2038d4b80166f7bead8d07eba3b97405816c21	patch
https://git.kernel.org/stable/c/68667ee4c7dadf7f63167234e2a1af09b3f7874e	patch
https://git.kernel.org/stable/c/6140cfa721451fa6e18e134e709703c2bf34d0fb	patch
https://git.kernel.org/stable/c/f14fe6395a8b3d961a61e138ad7b36ba3626dd4e	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.