CVE-2026-63971 (GCVE-0-2026-63971)
Vulnerability from cvelistv5
Published
2026-07-19 14:55
Modified
2026-10-19 20:17
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 668c9beb9020d5834ee9e43c208190a07d2b1928
Version: 668c9beb9020d5834ee9e43c208190a07d2b1928
Version: 668c9beb9020d5834ee9e43c208190a07d2b1928
Version: 668c9beb9020d5834ee9e43c208190a07d2b1928
Version: 668c9beb9020d5834ee9e43c208190a07d2b1928
Version: 668c9beb9020d5834ee9e43c208190a07d2b1928
Version: 668c9beb9020d5834ee9e43c208190a07d2b1928
Version: 668c9beb9020d5834ee9e43c208190a07d2b1928
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    "cveId": "CVE-2026-63971",
    "datePublished": "2026-07-19T14:55:57.792Z",
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    "dateUpdated": "2026-10-19T20:17:59.440Z",
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A remote peer can only help complete the SCTP handshake; it cannot invoke peeloff or the racing send path.\\nAC:L - The attacker controls both sides of the race by running concurrent threads on the same SCTP one-to-many socket, timing peeloff during the window where `sctp_wait_for_connect()` has released the socket lock. Required options (`SCTP_FRAGMENT_INTERLEAVE`, `SCTP_INTERLEAVING_SUPPORTED`, and `net.sctp.intl_enable`) are attacker-settable in a user/net namespace.\\nPR:L - No real-root capability is required; an unprivileged user can create SCTP sockets and drive the full race from a user namespace (`unshare -Urn`), including enabling `net.sctp.intl_enable` and the interleaving socket options needed to reach the vulnerable `sctp_sendmsg_to_asoc()` path.\\nUI:N - Exploitation is fully attacker-driven through coordinated local threads and does not require any action from a victim user or administrator beyond normal SCTP socket use.\\nS:U - Impact is confined to kernel memory integrity/availability within the same security authority; successful exploitation would be local privilege escalation, not a cross-boundary escape such as VM or container breakout by itself.\\nC:H - After peeloff migrates `asoc-\u003ebase.sk`, the caller continues in `sctp_datamsg_from_user()` while holding the wrong socket lock, creating unsynchronized concurrent access to association/stream state that can corrupt kernel heap metadata and be leveraged for arbitrary kernel memory disclosure.\\nI:H - The post-race path builds and queues DATA/I-DATA chunks via `sctp_datamsg_from_user()` and `sctp_primitive_SEND()` without the correct socket lock, enabling concurrent modification of association output queues and stream structures that can be turned into arbitrary kernel writes or control-flow hijacking.\\nA:H - Concurrent unsynchronized access to a live SCTP association after peeloff can cause kernel oops/panic or wedged associations, and the underlying race is a classic kernel concurrency defect with high availability impact even before full exploitation.\"}]}], \"affected\": [{\"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\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/0e0d5bc76fd4267a71334fcc8f1a5fbcf997845d\"}, {\"url\": \"https://git.kernel.org/stable/c/bcfeac79af740735ace44008b4a11b8e5add20f5\"}, {\"url\": \"https://git.kernel.org/stable/c/8e9b56051d24540cfbf39194618708c4a7633549\"}, {\"url\": \"https://git.kernel.org/stable/c/634a9af8a26a84d8b0d7b3b643204b344b42d9fb\"}, {\"url\": \"https://git.kernel.org/stable/c/7d2038d4b80166f7bead8d07eba3b97405816c21\"}, {\"url\": \"https://git.kernel.org/stable/c/68667ee4c7dadf7f63167234e2a1af09b3f7874e\"}, {\"url\": \"https://git.kernel.org/stable/c/6140cfa721451fa6e18e134e709703c2bf34d0fb\"}, {\"url\": \"https://git.kernel.org/stable/c/f14fe6395a8b3d961a61e138ad7b36ba3626dd4e\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nsctp: fix race between sctp_wait_for_connect and peeloff\\n\\nsctp_wait_for_connect() drops and re-acquires the socket lock while\\nwaiting for the association to reach ESTABLISHED state. During this\\nwindow, another thread can peeloff the association to a new socket via\\ngetsockopt(SCTP_SOCKOPT_PEELOFF), changing asoc-\u003ebase.sk. After\\nre-acquiring the old socket lock, sctp_wait_for_connect() returns\\nsuccess without noticing the migration \\u2014 the caller then accesses\\nthe association under the wrong lock in sctp_datamsg_from_user().\\n\\nAdd the same sk != asoc-\u003ebase.sk check that sctp_wait_for_sndbuf()\\nalready has, returning an error if the association was migrated while\\nwe slept.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.259\", \"versionStartIncluding\": \"4.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.210\", \"versionStartIncluding\": \"4.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.176\", \"versionStartIncluding\": \"4.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.143\", \"versionStartIncluding\": \"4.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.93\", \"versionStartIncluding\": \"4.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.35\", \"versionStartIncluding\": \"4.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.0.12\", \"versionStartIncluding\": \"4.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1\", \"versionStartIncluding\": \"4.16\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T12:37:42.789Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-63971\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T20:17:59.440Z\", \"dateReserved\": \"2026-07-19T07:54:57.024Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-07-19T14:55:57.792Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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