320 lines
16 KiB
JSON
320 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-2026-68118",
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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": "2026-07-30T09:28:09.369Z",
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"datePublished": "2026-08-10T11:58:38.000Z",
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"dateUpdated": "2026-10-30T12:28:06.412Z"
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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": "2026-10-30T12:28:06.412Z"
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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\ntcp: challenge ACK for non-exact RST in SYN-RECEIVED\n\nThe SYN-RECEIVED request-socket path in tcp_check_req() accepts an\nin-window RST without requiring SEG.SEQ to exactly match RCV.NXT. A\nnon-exact RST therefore removes the request instead of eliciting a\nchallenge ACK.\n\nRFC 9293 section 3.10.7.4 applies the RFC 5961 reset check in\nSYN-RECEIVED: an exact RST resets the connection, while a non-exact\nin-window RST must trigger a challenge ACK and be dropped.\n\nApply that check before the ACK-field validation, following the RFC\nsequence-number, RST, then ACK processing order. Factor the per-netns\nchallenge ACK quota out of tcp_send_challenge_ack() so request sockets\ncan share it. Use the request socket's send_ack() callback and its own\nout-of-window ACK timestamp to send and rate-limit the response."
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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:N/I:L/A:H",
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"baseScore": 8.2,
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"baseSeverity": "HIGH"
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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 - The bug is in tcp_check_req() on the core TCP receive path (ip_rcv/tcp_v4_rcv or tcp_v6_rcv → __inet_lookup_skb on TCP_NEW_SYN_RECV → tcp_check_req); any remote host that can deliver TCP segments to an internet-facing listener reaches it with no local access.\nAC:L - An attacker controls the forged RST (source/dest ports, SEQ sweep across the SYN-RECEIVED window up to tcp_synack_window/65535) and can retry on every handshake; no race, rare config, or victim-only state outside attacker influence is required beyond routine IP spoofing or on-path delivery.\nPR:N - Processing occurs on the pre-authentication TCP handshake path for embryonic request sockets; no credentials, capabilities, or local account are needed—only the ability to send (or spoof) TCP packets to the target listener.\nUI:N - Handshake teardown is triggered automatically when the kernel receives the crafted RST during SYN-RECEIVED; no victim must open files, click links, or perform any other action.\nS:U - Impact is confined to incorrect TCP connection-state handling within the same host kernel; it does not cross VM, container, or IOMMU security boundaries.\nC:N - This is a protocol state-machine logic flaw with no memory corruption, out-of-bounds access, use-after-free, or information disclosure—only embryonic request-socket teardown occurs.\nI:L - A non-exact in-window RST causes unauthorized modification of TCP connection state by dropping the embryonic request socket (embryonic_reset/inet_csk_reqsk_queue_drop) instead of preserving it per RFC 5961/RFC 9293.\nA:H - Repeated spoofed in-window RSTs during SYN-RECEIVED can prevent TCP handshakes from completing on arbitrary listening services (HTTPS, SSH, databases, load balancers), causing sustained denial of service without kernel crash."
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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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"include/net/tcp.h",
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"net/ipv4/tcp_input.c",
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"net/ipv4/tcp_minisocks.c"
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],
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"versions": [
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{
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"version": "282f23c6ee343126156dd41218b22ece96d747e3",
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"lessThan": "c5dc463cc60eb26079b19607c9dbda76491dad05",
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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": "282f23c6ee343126156dd41218b22ece96d747e3",
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"lessThan": "8b0a3a094f4cae2fb92e4d08d4eef7246a9d9c49",
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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": "282f23c6ee343126156dd41218b22ece96d747e3",
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"lessThan": "0fe4636665d14a258de70b4f3e8248e6d42038f1",
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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": "282f23c6ee343126156dd41218b22ece96d747e3",
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"lessThan": "234f9ffbd9b2c1b24ec67200ea3cff07401bec48",
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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": "282f23c6ee343126156dd41218b22ece96d747e3",
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"lessThan": "22cec809b048495310f206d9abbcdbbfbdce3ae3",
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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": "282f23c6ee343126156dd41218b22ece96d747e3",
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"lessThan": "a28c4fcbf774e23b4779cae468e3497a5ad1f4a1",
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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": "86791bbfe5ed7b275be040cfeff049a1624af1b7",
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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": "61f69dc4e40e41b0018f00fa4aeb23d3239556fb",
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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": "34fb350281ced2a72707a5c0064f69992d440edb",
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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": "3.0.58",
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"lessThan": "3.1",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "3.2.37",
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"lessThan": "3.3",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "3.4.25",
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"lessThan": "3.5",
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"status": "affected",
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"versionType": "semver"
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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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"include/net/tcp.h",
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"net/ipv4/tcp_input.c",
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"net/ipv4/tcp_minisocks.c"
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],
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"versions": [
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{
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"version": "3.6",
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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": "3.6",
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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": "6.1.191",
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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": "6.6.153",
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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": "6.12.105",
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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": "6.18.42",
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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": "7.1.6",
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"lessThanOrEqual": "7.1.*",
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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": "7.2",
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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": "3.6",
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"versionEndExcluding": "6.1.191"
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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/c5dc463cc60eb26079b19607c9dbda76491dad05"
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},
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{
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"url": "https://git.kernel.org/stable/c/8b0a3a094f4cae2fb92e4d08d4eef7246a9d9c49"
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},
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{
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"url": "https://git.kernel.org/stable/c/0fe4636665d14a258de70b4f3e8248e6d42038f1"
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},
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{
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"url": "https://git.kernel.org/stable/c/234f9ffbd9b2c1b24ec67200ea3cff07401bec48"
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},
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{
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"url": "https://git.kernel.org/stable/c/22cec809b048495310f206d9abbcdbbfbdce3ae3"
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},
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{
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"url": "https://git.kernel.org/stable/c/a28c4fcbf774e23b4779cae468e3497a5ad1f4a1"
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}
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],
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"title": "tcp: challenge ACK for non-exact RST in SYN-RECEIVED",
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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-2026-68118",
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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": "partial"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-10-16T15:44:08.841575Z"
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}
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}
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}
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],
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"problemTypes": [
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{
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"descriptions": [
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{
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"lang": "en",
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"type": "CWE",
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"cweId": "CWE-20",
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"description": "CWE-20 Improper Input Validation"
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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": "2026-10-19T20:58:51.621Z"
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}
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}
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]
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}
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} |