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sctp: fix race between sctp_wait_for_connect and peeloff

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

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
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Publisher date
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