sctp: fix race between sctp_wait_for_connect and peeloff

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-63971
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-19 16:17:16 UTC
Updated2026-07-20 15:16:59 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.002100000 probability, percentile 0.113630000 (date 2026-07-20)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 668c9beb9020d5834ee9e43c208190a07d2b1928 0e0d5bc76fd4267a71334fcc8f1a5fbcf997845d git Not specified
CNA Linux Linux affected 668c9beb9020d5834ee9e43c208190a07d2b1928 bcfeac79af740735ace44008b4a11b8e5add20f5 git Not specified
CNA Linux Linux affected 668c9beb9020d5834ee9e43c208190a07d2b1928 8e9b56051d24540cfbf39194618708c4a7633549 git Not specified
CNA Linux Linux affected 668c9beb9020d5834ee9e43c208190a07d2b1928 634a9af8a26a84d8b0d7b3b643204b344b42d9fb git Not specified
CNA Linux Linux affected 668c9beb9020d5834ee9e43c208190a07d2b1928 7d2038d4b80166f7bead8d07eba3b97405816c21 git Not specified
CNA Linux Linux affected 668c9beb9020d5834ee9e43c208190a07d2b1928 68667ee4c7dadf7f63167234e2a1af09b3f7874e git Not specified
CNA Linux Linux affected 668c9beb9020d5834ee9e43c208190a07d2b1928 6140cfa721451fa6e18e134e709703c2bf34d0fb git Not specified
CNA Linux Linux affected 668c9beb9020d5834ee9e43c208190a07d2b1928 f14fe6395a8b3d961a61e138ad7b36ba3626dd4e git Not specified
CNA Linux Linux affected 4.16 Not specified
CNA Linux Linux unaffected 4.16 semver Not specified
CNA Linux Linux unaffected 5.10.259 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.210 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.176 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.143 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.93 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.35 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.12 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/bcfeac79af740735ace44008b4a11b8e5add20f5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7d2038d4b80166f7bead8d07eba3b97405816c21 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/68667ee4c7dadf7f63167234e2a1af09b3f7874e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8e9b56051d24540cfbf39194618708c4a7633549 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0e0d5bc76fd4267a71334fcc8f1a5fbcf997845d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f14fe6395a8b3d961a61e138ad7b36ba3626dd4e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/634a9af8a26a84d8b0d7b3b643204b344b42d9fb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6140cfa721451fa6e18e134e709703c2bf34d0fb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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