{"api_version":"1","generated_at":"2026-10-24T11:39:25+00:00","cve":"CVE-2021-46999","urls":{"html":"https://cve.report/CVE-2021-46999","api":"https://cve.report/api/cve/CVE-2021-46999.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2021-46999","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-46999"},"summary":{"title":"sctp: do asoc update earlier in sctp_sf_do_dupcook_a","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: do asoc update earlier in sctp_sf_do_dupcook_a\n\nThere's a panic that occurs in a few of envs, the call trace is as below:\n\n  [] general protection fault, ... 0x29acd70f1000a: 0000 [#1] SMP PTI\n  [] RIP: 0010:sctp_ulpevent_notify_peer_addr_change+0x4b/0x1fa [sctp]\n  []  sctp_assoc_control_transport+0x1b9/0x210 [sctp]\n  []  sctp_do_8_2_transport_strike.isra.16+0x15c/0x220 [sctp]\n  []  sctp_cmd_interpreter.isra.21+0x1231/0x1a10 [sctp]\n  []  sctp_do_sm+0xc3/0x2a0 [sctp]\n  []  sctp_generate_timeout_event+0x81/0xf0 [sctp]\n\nThis is caused by a transport use-after-free issue. When processing a\nduplicate COOKIE-ECHO chunk in sctp_sf_do_dupcook_a(), both COOKIE-ACK\nand SHUTDOWN chunks are allocated with the transort from the new asoc.\nHowever, later in the sideeffect machine, the old asoc is used to send\nthem out and old asoc's shutdown_last_sent_to is set to the transport\nthat SHUTDOWN chunk attached to in sctp_cmd_setup_t2(), which actually\nbelongs to the new asoc. After the new_asoc is freed and the old asoc\nT2 timeout, the old asoc's shutdown_last_sent_to that is already freed\nwould be accessed in sctp_sf_t2_timer_expire().\n\nThanks Alexander and Jere for helping dig into this issue.\n\nTo fix it, this patch is to do the asoc update first, then allocate\nthe COOKIE-ACK and SHUTDOWN chunks with the 'updated' old asoc. This\nwould make more sense, as a chunk from an asoc shouldn't be sent out\nwith another asoc. We had fixed quite a few issues caused by this.","state":"PUBLISHED","assigner":"Linux","published_at":"2024-02-28 09:15:38","updated_at":"2026-08-04 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the Linux kernel, the following vulnerability has been resolved:\n\nsctp: do asoc update earlier in sctp_sf_do_dupcook_a\n\nThere's a panic that occurs in a few of envs, the call trace is as below:\n\n  [] general protection fault, ... 0x29acd70f1000a: 0000 [#1] SMP PTI\n  [] RIP: 0010:sctp_ulpevent_notify_peer_addr_change+0x4b/0x1fa [sctp]\n  []  sctp_assoc_control_transport+0x1b9/0x210 [sctp]\n  []  sctp_do_8_2_transport_strike.isra.16+0x15c/0x220 [sctp]\n  []  sctp_cmd_interpreter.isra.21+0x1231/0x1a10 [sctp]\n  []  sctp_do_sm+0xc3/0x2a0 [sctp]\n  []  sctp_generate_timeout_event+0x81/0xf0 [sctp]\n\nThis is caused by a transport use-after-free issue. When processing a\nduplicate COOKIE-ECHO chunk in sctp_sf_do_dupcook_a(), both COOKIE-ACK\nand SHUTDOWN chunks are allocated with the transort from the new asoc.\nHowever, later in the sideeffect machine, the old asoc is used to send\nthem out and old asoc's shutdown_last_sent_to is set to the transport\nthat SHUTDOWN chunk attached to in sctp_cmd_setup_t2(), which actually\nbelongs to the new asoc. After the new_asoc is freed and the old asoc\nT2 timeout, the old asoc's shutdown_last_sent_to that is already freed\nwould be accessed in sctp_sf_t2_timer_expire().\n\nThanks Alexander and Jere for helping dig into this issue.\n\nTo fix it, this patch is to do the asoc update first, then allocate\nthe COOKIE-ACK and SHUTDOWN chunks with the 'updated' old asoc. This\nwould make more sense, as a chunk from an asoc shouldn't be sent out\nwith another asoc. We had fixed quite a few issues caused by this."}],"metrics":[{"cvssV3_1":{"baseScore":9.8,"baseSeverity":"CRITICAL","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"providerMetadata":{"dateUpdated":"2026-08-04T08:58:13.525Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/d624f2991b977821375fbd56c91b0c91d456a697"},{"url":"https://git.kernel.org/stable/c/b1b31948c0af44628e43353828453461bb74098f"},{"url":"https://git.kernel.org/stable/c/f01988ecf3654f805282dce2d3bb9afe68d2691e"},{"url":"https://git.kernel.org/stable/c/61b877bad9bb0d82b7d8841be50872557090a704"},{"url":"https://git.kernel.org/stable/c/0bfd913c2121b3d553bfd52810fe6061d542d625"},{"url":"https://git.kernel.org/stable/c/35b4f24415c854cd718ccdf38dbea6297f010aae"}],"title":"sctp: do asoc update earlier in sctp_sf_do_dupcook_a","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2021-46999","datePublished":"2024-02-28T08:13:22.256Z","dateReserved":"2024-02-27T18:42:55.950Z","dateUpdated":"2026-08-04T08:58:13.525Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2024-02-28 09:15:38","lastModifiedDate":"2026-08-04 10:16:40","problem_types":["CWE-416"],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":9.8,"baseSeverity":"CRITICAL","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":3.9,"impactScore":5.9},{"source":"nvd@nist.gov","type":"Primary","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}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2024-06-21T16:28:23.491999Z","id":"CVE-2021-46999","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19.123","versionEndExcluding":"4.19.191","matchCriteriaId":"D20BDA16-5AB8-4904-BD6D-95AA2838AC18"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4.41","versionEndExcluding":"5.4.120","matchCriteriaId":"D251349F-754D-42A1-9056-739E6B415320"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.7","versionEndExcluding":"5.10.38","matchCriteriaId":"4EC70BEE-8480-4726-B12A-17BED681CD70"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"5.11.22","matchCriteriaId":"83B53E9A-F426-4C03-9A5F-A931FF79827E"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.12","versionEndExcluding":"5.12.5","matchCriteriaId":"0274929A-B36C-4F4C-AB22-30A0DD6B995B"}]}]}]},"legacy_mitre":{"record":{"CveYear":"2021","CveId":"46999","Ordinal":"1","Title":"sctp: do asoc update earlier in sctp_sf_do_dupcook_a","CVE":"CVE-2021-46999","Year":"2021"},"notes":[{"CveYear":"2021","CveId":"46999","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: do asoc update earlier in sctp_sf_do_dupcook_a\n\nThere's a panic that occurs in a few of envs, the call trace is as below:\n\n  [] general protection fault, ... 0x29acd70f1000a: 0000 [#1] SMP PTI\n  [] RIP: 0010:sctp_ulpevent_notify_peer_addr_change+0x4b/0x1fa [sctp]\n  []  sctp_assoc_control_transport+0x1b9/0x210 [sctp]\n  []  sctp_do_8_2_transport_strike.isra.16+0x15c/0x220 [sctp]\n  []  sctp_cmd_interpreter.isra.21+0x1231/0x1a10 [sctp]\n  []  sctp_do_sm+0xc3/0x2a0 [sctp]\n  []  sctp_generate_timeout_event+0x81/0xf0 [sctp]\n\nThis is caused by a transport use-after-free issue. When processing a\nduplicate COOKIE-ECHO chunk in sctp_sf_do_dupcook_a(), both COOKIE-ACK\nand SHUTDOWN chunks are allocated with the transort from the new asoc.\nHowever, later in the sideeffect machine, the old asoc is used to send\nthem out and old asoc's shutdown_last_sent_to is set to the transport\nthat SHUTDOWN chunk attached to in sctp_cmd_setup_t2(), which actually\nbelongs to the new asoc. After the new_asoc is freed and the old asoc\nT2 timeout, the old asoc's shutdown_last_sent_to that is already freed\nwould be accessed in sctp_sf_t2_timer_expire().\n\nThanks Alexander and Jere for helping dig into this issue.\n\nTo fix it, this patch is to do the asoc update first, then allocate\nthe COOKIE-ACK and SHUTDOWN chunks with the 'updated' old asoc. This\nwould make more sense, as a chunk from an asoc shouldn't be sent out\nwith another asoc. We had fixed quite a few issues caused by this.","Type":"Description","Title":"sctp: do asoc update earlier in sctp_sf_do_dupcook_a"}]}}}