sctp: fix race between sctp_wait_for_connect and peeloff
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.
CVE-2026-63971
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-63971
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "668c9beb9020d5834ee9e43c208190a07d2b1928",
"lessThan": "0e0d5bc76fd4267a71334fcc8f1a5fbcf997845d",
"versionType": "git"
},
{
"status": "affected",
"version": "668c9beb9020d5834ee9e43c208190a07d2b1928",
"lessThan": "bcfeac79af740735ace44008b4a11b8e5add20f5",
"versionType": "git"
},
{
"status": "affected",
"version": "668c9beb9020d5834ee9e43c208190a07d2b1928",
"lessThan": "8e9b56051d24540cfbf39194618708c4a7633549",
"versionType": "git"
},
{
"status": "affected",
"version": "668c9beb9020d5834ee9e43c208190a07d2b1928",
"lessThan": "634a9af8a26a84d8b0d7b3b643204b344b42d9fb",
"versionType": "git"
},
{
"status": "affected",
"version": "668c9beb9020d5834ee9e43c208190a07d2b1928",
"lessThan": "7d2038d4b80166f7bead8d07eba3b97405816c21",
"versionType": "git"
},
{
"status": "affected",
"version": "668c9beb9020d5834ee9e43c208190a07d2b1928",
"lessThan": "68667ee4c7dadf7f63167234e2a1af09b3f7874e",
"versionType": "git"
},
{
"status": "affected",
"version": "668c9beb9020d5834ee9e43c208190a07d2b1928",
"lessThan": "6140cfa721451fa6e18e134e709703c2bf34d0fb",
"versionType": "git"
},
{
"status": "affected",
"version": "668c9beb9020d5834ee9e43c208190a07d2b1928",
"lessThan": "f14fe6395a8b3d961a61e138ad7b36ba3626dd4e",
"versionType": "git"
}
],
"programFiles": [
"net/sctp/socket.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.16"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.16",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.259",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.210",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.176",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.143",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.93",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.35",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.0.12",
"versionType": "semver",
"lessThanOrEqual": "7.0.*"
},
{
"status": "unaffected",
"version": "7.1",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/sctp/socket.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-63971
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #40913 · Revision 1
- Added to Heist Feed
- Publisher date