298 lines
16 KiB
JSON
298 lines
16 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-89478",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-09-11T19:38:34.711Z",
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"datePublished": "2026-09-11T19:43:34.588Z",
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"dateUpdated": "2026-10-19T08:47:27.202Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-10-19T08:47:27.202Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 9.8,
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"baseSeverity": "CRITICAL"
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},
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"scenarios": [
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{
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"lang": "en",
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"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."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"net/sctp/inqueue.c"
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],
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"versions": [
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{
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"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
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"lessThan": "3fc072e7cb4a0ff251d13cfc2d24f62489cd9386",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
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"lessThan": "d7cb5ad832095dc4becfdb2a36007ffd50e49fb0",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
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"lessThan": "0422b092a3d43ca462932ff9f747731ca078d1d4",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
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"lessThan": "928fd7920ba37cc5637a211b9be979083413a2fa",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
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"lessThan": "c6c86a5e62a4fec36692ddd64b9144b660f71f96",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
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"lessThan": "1035bdef1efb9b1076d1a57b81e08c637ff08ecc",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
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"lessThan": "3537961df2163258bddc230db0e18dc14e925ea6",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
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"lessThan": "03a9d10ecf71f54b2af8020935f2033d4a132be5",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"net/sctp/inqueue.c"
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],
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"versions": [
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{
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"version": "2.6.12",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "2.6.12",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.10.270",
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"lessThanOrEqual": "5.10.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.15.221",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.1.188",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.157",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.109",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.50",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2.4",
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"lessThanOrEqual": "7.2.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.3",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "2.6.12",
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"versionEndExcluding": "5.10.270"
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"versionEndExcluding": "6.6.157"
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionEndExcluding": "6.12.109"
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{
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}
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/3fc072e7cb4a0ff251d13cfc2d24f62489cd9386"
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},
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{
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"url": "https://git.kernel.org/stable/c/d7cb5ad832095dc4becfdb2a36007ffd50e49fb0"
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},
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{
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"url": "https://git.kernel.org/stable/c/0422b092a3d43ca462932ff9f747731ca078d1d4"
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},
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{
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"url": "https://git.kernel.org/stable/c/928fd7920ba37cc5637a211b9be979083413a2fa"
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},
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{
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"url": "https://git.kernel.org/stable/c/c6c86a5e62a4fec36692ddd64b9144b660f71f96"
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},
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{
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"url": "https://git.kernel.org/stable/c/1035bdef1efb9b1076d1a57b81e08c637ff08ecc"
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},
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{
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"url": "https://git.kernel.org/stable/c/3537961df2163258bddc230db0e18dc14e925ea6"
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},
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{
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"url": "https://git.kernel.org/stable/c/03a9d10ecf71f54b2af8020935f2033d4a132be5"
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}
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],
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"title": "sctp: drop a chunk if its transport was removed",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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},
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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2026-89478",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "yes"
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},
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{
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"Technical Impact": "total"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-10-16T19:22:25.085426Z"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-10-16T19:26:39.233Z"
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}
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}
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]
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}
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} |