{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "668c9beb9020d5834ee9e43c208190a07d2b1928"
            },
            {
              "fixed": "0e0d5bc76fd4267a71334fcc8f1a5fbcf997845d"
            },
            {
              "fixed": "bcfeac79af740735ace44008b4a11b8e5add20f5"
            },
            {
              "fixed": "8e9b56051d24540cfbf39194618708c4a7633549"
            },
            {
              "fixed": "634a9af8a26a84d8b0d7b3b643204b344b42d9fb"
            },
            {
              "fixed": "7d2038d4b80166f7bead8d07eba3b97405816c21"
            },
            {
              "fixed": "68667ee4c7dadf7f63167234e2a1af09b3f7874e"
            },
            {
              "fixed": "6140cfa721451fa6e18e134e709703c2bf34d0fb"
            },
            {
              "fixed": "f14fe6395a8b3d961a61e138ad7b36ba3626dd4e"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.16.0"
            },
            {
              "fixed": "5.10.259"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.210"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.176"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.143"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.93"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.35"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.0.12"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63971.json"
  },
  "details": "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 — 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.",
  "id": "CVE-2026-63971",
  "modified": "2026-07-22T05:29:55.479016786Z",
  "published": "2026-07-19T14:55:57.792Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0e0d5bc76fd4267a71334fcc8f1a5fbcf997845d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6140cfa721451fa6e18e134e709703c2bf34d0fb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/634a9af8a26a84d8b0d7b3b643204b344b42d9fb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/68667ee4c7dadf7f63167234e2a1af09b3f7874e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7d2038d4b80166f7bead8d07eba3b97405816c21"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8e9b56051d24540cfbf39194618708c4a7633549"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bcfeac79af740735ace44008b4a11b8e5add20f5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f14fe6395a8b3d961a61e138ad7b36ba3626dd4e"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63971.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-63971"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "sctp: fix race between sctp_wait_for_connect and peeloff"
}