{"api_version":"1","generated_at":"2026-07-23T18:54:05+00:00","cve":"CVE-2026-63971","urls":{"html":"https://cve.report/CVE-2026-63971","api":"https://cve.report/api/cve/CVE-2026-63971.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-63971","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-63971"},"summary":{"title":"sctp: fix race between sctp_wait_for_connect and peeloff","description":"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->base.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->base.sk check that sctp_wait_for_sndbuf()\nalready has, returning an error if the association was migrated while\nwe slept.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-07-19 16:17:16","updated_at":"2026-07-20 15:16:59"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/bcfeac79af740735ace44008b4a11b8e5add20f5","name":"https://git.kernel.org/stable/c/bcfeac79af740735ace44008b4a11b8e5add20f5","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/7d2038d4b80166f7bead8d07eba3b97405816c21","name":"https://git.kernel.org/stable/c/7d2038d4b80166f7bead8d07eba3b97405816c21","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/68667ee4c7dadf7f63167234e2a1af09b3f7874e","name":"https://git.kernel.org/stable/c/68667ee4c7dadf7f63167234e2a1af09b3f7874e","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/8e9b56051d24540cfbf39194618708c4a7633549","name":"https://git.kernel.org/stable/c/8e9b56051d24540cfbf39194618708c4a7633549","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/0e0d5bc76fd4267a71334fcc8f1a5fbcf997845d","name":"https://git.kernel.org/stable/c/0e0d5bc76fd4267a71334fcc8f1a5fbcf997845d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/f14fe6395a8b3d961a61e138ad7b36ba3626dd4e","name":"https://git.kernel.org/stable/c/f14fe6395a8b3d961a61e138ad7b36ba3626dd4e","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/634a9af8a26a84d8b0d7b3b643204b344b42d9fb","name":"https://git.kernel.org/stable/c/634a9af8a26a84d8b0d7b3b643204b344b42d9fb","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/6140cfa721451fa6e18e134e709703c2bf34d0fb","name":"https://git.kernel.org/stable/c/6140cfa721451fa6e18e134e709703c2bf34d0fb","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-63971","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-63971","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 668c9beb9020d5834ee9e43c208190a07d2b1928 0e0d5bc76fd4267a71334fcc8f1a5fbcf997845d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 668c9beb9020d5834ee9e43c208190a07d2b1928 bcfeac79af740735ace44008b4a11b8e5add20f5 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 668c9beb9020d5834ee9e43c208190a07d2b1928 8e9b56051d24540cfbf39194618708c4a7633549 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 668c9beb9020d5834ee9e43c208190a07d2b1928 634a9af8a26a84d8b0d7b3b643204b344b42d9fb git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.210 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.176 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.143 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.93 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.35 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0.12 7.0.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"63971","cve":"CVE-2026-63971","epss":"0.002100000","percentile":"0.113630000","score_date":"2026-07-20","updated_at":"2026-07-21 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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->base.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->base.sk check that sctp_wait_for_sndbuf()\nalready has, returning an error if the association was migrated while\nwe slept."}],"metrics":[{"cvssV3_1":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"providerMetadata":{"dateUpdated":"2026-07-20T13:41:56.086Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"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"}],"title":"sctp: fix race between sctp_wait_for_connect and peeloff","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-63971","datePublished":"2026-07-19T14:55:57.792Z","dateReserved":"2026-07-19T07:54:57.024Z","dateUpdated":"2026-07-20T13:41:56.086Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-07-19 16:17:16","lastModifiedDate":"2026-07-20 15:16:59","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"63971","Ordinal":"1","Title":"sctp: fix race between sctp_wait_for_connect and peeloff","CVE":"CVE-2026-63971","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"63971","Ordinal":"1","NoteData":"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->base.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->base.sk check that sctp_wait_for_sndbuf()\nalready has, returning an error if the association was migrated while\nwe slept.","Type":"Description","Title":"sctp: fix race between sctp_wait_for_connect and peeloff"}]}}}