{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-89478", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.711Z", "datePublished": "2026-09-11T19:43:34.588Z", "dateUpdated": "2026-09-13T06:29:46.612Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-09-13T06:29:46.612Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: drop a chunk if its transport was removed\n\nsctp_rcv() resolves the transport once per packet and leaves it in\nchunk->transport. The lookup reference, or the one sctp_add_backlog() takes\nif the socket is owned by userspace, keeps it around until the chunk has\nbeen processed.\n\nAn authenticated ASCONF DEL-IP can remove it in the meantime.\nsctp_assoc_rm_peer() takes the transport out of the association and calls\nsctp_transport_free(), which tags it dead and drops the reference the\nassociation held. There is a window on both paths: the packet can sit on\nthe socket backlog, and on the direct path the lookup completes before\nbh_lock_sock().\n\nThe DATA chunk in that packet puts the removed transport back into\nasoc->peer.last_data_from. Once the packet is done that reference goes\naway and the transport is freed by RCU, so the next delayed SACK carries\nthe pointer into the SACK chunk and sctp_outq_select_transport() reads the\nfreed transport's state.\n\nDrop the chunk in sctp_inq_push(), next to the existing rcvr->dead check.\nBoth paths reach it with the association's socket lock held. The peer\nretransmits it."}], "metrics": [{"cvssV3_1": {"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"}, "scenarios": [{"lang": "en", "value": "AV:N - A remote SCTP peer reaches the bug via received packets in sctp_rcv() on internet-facing SCTP servers and telecom endpoints; DATA that already resolved a transport is processed after an authenticated ASCONF DEL-IP (or COOKIE-ECHO restart) has removed that peer.\nAC:L - The attacker controls both sides of the race by sending ASCONF DEL-IP (or a restart that calls sctp_assoc_rm_peer) and a DATA chunk whose lookup already holds the doomed transport; the backlog path is FIFO-deterministic while the socket is in a syscall, and the direct path is a bh_lock_sock race the attacker creates.\nPR:N - Exploitation requires only a network-reachable established SCTP association; no local Linux credentials, capabilities, or namespaces are needed, and SCTP-AUTH keys used for ASCONF come from the handshake the peer itself performs.\nUI:N - Inbound SCTP packets are processed automatically in softirq or socket backlog on a listening or already-associated endpoint; no victim user action such as opening a file or mounting a device is required.\nS:U - Impact is kernel memory corruption and potential privilege escalation within the host SCTP stack; it does not cross a VM, IOMMU, or other security-authority boundary.\nC:H - DATA processing plants the removed transport into asoc->peer.last_data_from; after the lookup reference is dropped the object is RCU-freed, and the next delayed SACK dereferences the freed sctp_transport in sctp_outq_select_transport(), a UAF that enables arbitrary kernel disclosure via heap grooming.\nI:H - sctp_outq_select_transport() does list_add_tail() into the freed send_ready field, and sctp_packet_config()/sctp_transport_burst_limited() write vtag, pathmtu, cwnd, and burst_limited into the reclaimed slab object, yielding arbitrary write and control-flow hijack primitives.\nA:H - Dereferencing the freed transport during delayed SACK transmission can immediately oops or panic the kernel, and the UAF can be triggered repeatedly by a malicious SCTP peer."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/sctp/inqueue.c"], "versions": [{"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "c6c86a5e62a4fec36692ddd64b9144b660f71f96", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "1035bdef1efb9b1076d1a57b81e08c637ff08ecc", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "3537961df2163258bddc230db0e18dc14e925ea6", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "03a9d10ecf71f54b2af8020935f2033d4a132be5", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/sctp/inqueue.c"], "versions": [{"version": "2.6.12", "status": "affected"}, {"version": "0", "lessThan": "2.6.12", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.109", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.50", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.4", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3-rc1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.12.109"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.18.50"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "7.2.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "7.3-rc1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/c6c86a5e62a4fec36692ddd64b9144b660f71f96"}, {"url": "https://git.kernel.org/stable/c/1035bdef1efb9b1076d1a57b81e08c637ff08ecc"}, {"url": "https://git.kernel.org/stable/c/3537961df2163258bddc230db0e18dc14e925ea6"}, {"url": "https://git.kernel.org/stable/c/03a9d10ecf71f54b2af8020935f2033d4a132be5"}], "title": "sctp: drop a chunk if its transport was removed", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/sctp/inqueue.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "c6c86a5e62a4fec36692ddd64b9144b660f71f96", "status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "versionType": "git"}, {"lessThan": "1035bdef1efb9b1076d1a57b81e08c637ff08ecc", "status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "versionType": "git"}, {"lessThan": "3537961df2163258bddc230db0e18dc14e925ea6", "status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "versionType": "git"}, {"lessThan": "03a9d10ecf71f54b2af8020935f2033d4a132be5", "status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/sctp/inqueue.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "2.6.12"}, {"lessThan": "2.6.12", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.109", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.50", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3-rc1", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: drop a chunk if its transport was removed\n\nsctp_rcv() resolves the transport once per packet and leaves it in\nchunk->transport. The lookup reference, or the one sctp_add_backlog() takes\nif the socket is owned by userspace, keeps it around until the chunk has\nbeen processed.\n\nAn authenticated ASCONF DEL-IP can remove it in the meantime.\nsctp_assoc_rm_peer() takes the transport out of the association and calls\nsctp_transport_free(), which tags it dead and drops the reference the\nassociation held. There is a window on both paths: the packet can sit on\nthe socket backlog, and on the direct path the lookup completes before\nbh_lock_sock().\n\nThe DATA chunk in that packet puts the removed transport back into\nasoc->peer.last_data_from. Once the packet is done that reference goes\naway and the transport is freed by RCU, so the next delayed SACK carries\nthe pointer into the SACK chunk and sctp_outq_select_transport() reads the\nfreed transport's state.\n\nDrop the chunk in sctp_inq_push(), next to the existing rcvr->dead check.\nBoth paths reach it with the association's socket lock held. The peer\nretransmits it."}], "id": "CVE-2026-89478", "lastModified": "2026-09-13T07:17:10.933", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-09-11T20:19:29.207", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/03a9d10ecf71f54b2af8020935f2033d4a132be5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1035bdef1efb9b1076d1a57b81e08c637ff08ecc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3537961df2163258bddc230db0e18dc14e925ea6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c6c86a5e62a4fec36692ddd64b9144b660f71f96"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux kernel SCTP: Information disclosure or denial of service due to use-after-free", "id": "2532439", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2532439"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.9", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:H", "status": "draft"}, "cwe": "CWE-825", "details": ["A flaw was found in the Linux kernel's Stream Control Transmission Protocol (SCTP) implementation. An authenticated attacker could exploit a timing window during the removal of an SCTP transport. This could lead to the system attempting to read from freed memory, potentially causing a denial of service or information disclosure."], "name": "CVE-2026-89478", "public_date": "2026-09-11T19:43:34Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-89478\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-89478\nhttps://git.kernel.org/stable/c/03a9d10ecf71f54b2af8020935f2033d4a132be5\nhttps://git.kernel.org/stable/c/1035bdef1efb9b1076d1a57b81e08c637ff08ecc\nhttps://git.kernel.org/stable/c/3537961df2163258bddc230db0e18dc14e925ea6\nhttps://git.kernel.org/stable/c/c6c86a5e62a4fec36692ddd64b9144b660f71f96"], "threat_severity": "Important"}

{"created": "2026-09-12T16:30:13.326248+00:00", "updated": "2026-09-13T09:30:04.521739+00:00", "vendors": []}