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-2026-74746",
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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": "2026-08-15T05:44:03.931Z",
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"datePublished": "2026-08-26T14:36:55.963Z",
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"dateUpdated": "2026-10-16T19:26:23.781Z"
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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": "2026-08-27T05:01:07.405Z"
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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\nnetfilter: flowtable: publish GC-visible tuple last\n\nnf_flow_table_iterate() only treats original-direction tuple nodes as\nowning entries. Publishing the original node first lets GC observe and\nfree a flow while flow_offload_add() is still inserting the reply node.\nPublish the reply node first and the original node last so GC never\nsees a partially installed flow.\n\nKASAN can trigger slab-use-after-free read and write reports in the\nflowtable/rhashtable path (rht_deferred_worker, jhash, flow_offload_del,\nflow_offload_lookup, etc.)."
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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 - flow_offload_add runs from nft_flow_offload_eval on the FORWARD hook and from tc act_ct during softirq packet processing when remote TCP/UDP traffic creates new offloaded conntrack flows on nftables flowtable routers/gateways, not through netlink configuration APIs.\nAC:L - The attacker controls when flows are offloaded (packet rate/timing) and can race connection teardown so nf_flow_table_gc_run observes a partially installed original tuple while reply insertion is still in progress; both the insert and GC sides of the race are attacker-driven.\nPR:N - On the intended edge-router/OpenWrt deployment, nftables flow offload is an administrator prerequisite; a remote sender needs no local account, authentication, or CAP_NET_ADMIN on the victim to trigger flow_offload_add while forwarding traffic.\nUI:N - Exploitation requires only sending network packets processed automatically on the forwarding or ingress path; no victim must open files, mount filesystems, or take any interactive action beyond normal traffic through the router.\nS:U - Slab use-after-free in the flowtable rhashtable/GC path affects only in-kernel memory on the affected host; this is standard kernel compromise within one security authority, not a VM escape, IOMMU bypass, or cross-boundary sandbox break.\nC:H - The fix commit documents KASAN slab-use-after-free read and write reports in rht_deferred_worker, jhash, flow_offload_del, and flow_offload_lookup; UAF on flow_offload kmem-cache objects enables arbitrary kernel memory disclosure via heap grooming.\nI:H - Freed flow_offload structures remain reachable during concurrent rhashtable insert/remove and deferred worker operations, providing attacker-influenceable heap corruption that can be groomed into arbitrary kernel writes and control-flow hijack.\nA:H - Concurrent GC freeing of a partially inserted flow while flow_offload_add or rhashtable workers still access it causes kernel oops/panic and reliable denial of service; UAF on the flow offload path can crash forwarding routers under sustained malicious traffic."
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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/netfilter/nf_flow_table_core.c"
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],
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"versions": [
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{
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"version": "ac2a66665e231847cab11b8c8e844ce43207dd2e",
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"lessThan": "0a00254585827f1695aa2700114af622ea754cfa",
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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": "ac2a66665e231847cab11b8c8e844ce43207dd2e",
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"lessThan": "be345dcbddb4643a54252b954af974b16eda8f91",
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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": "ac2a66665e231847cab11b8c8e844ce43207dd2e",
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"lessThan": "211ee5d998d92a7d548811939c65942d06c146e4",
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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": "ac2a66665e231847cab11b8c8e844ce43207dd2e",
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"lessThan": "d37917e7bebe078f3c17e47fd6fc1c9f6e8497b2",
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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": "ac2a66665e231847cab11b8c8e844ce43207dd2e",
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"lessThan": "972fdf7c4f5c282a239c88fea614b056c33dc025",
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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": "ac2a66665e231847cab11b8c8e844ce43207dd2e",
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"lessThan": "d9d3050a70efe217e73a0751e55fdae6a7092620",
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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": "ac2a66665e231847cab11b8c8e844ce43207dd2e",
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"lessThan": "d16b71231e65cb05daea2b45701fcf09cef041e7",
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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": "ac2a66665e231847cab11b8c8e844ce43207dd2e",
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"lessThan": "2014ac62df9d45bb9a004a043e85df7be09ed780",
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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/netfilter/nf_flow_table_core.c"
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],
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"versions": [
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{
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"version": "4.16",
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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": "4.16",
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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": "5.10.266",
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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": "5.15.217",
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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": "6.1.184",
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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": "6.18.46",
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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": "7.1.10",
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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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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "4.16",
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"versionEndExcluding": "5.10.266"
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},
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/0a00254585827f1695aa2700114af622ea754cfa"
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},
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{
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"url": "https://git.kernel.org/stable/c/be345dcbddb4643a54252b954af974b16eda8f91"
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},
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{
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"url": "https://git.kernel.org/stable/c/211ee5d998d92a7d548811939c65942d06c146e4"
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},
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{
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"url": "https://git.kernel.org/stable/c/d37917e7bebe078f3c17e47fd6fc1c9f6e8497b2"
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},
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{
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"url": "https://git.kernel.org/stable/c/972fdf7c4f5c282a239c88fea614b056c33dc025"
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},
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{
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"url": "https://git.kernel.org/stable/c/d9d3050a70efe217e73a0751e55fdae6a7092620"
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},
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{
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"url": "https://git.kernel.org/stable/c/d16b71231e65cb05daea2b45701fcf09cef041e7"
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},
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{
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"url": "https://git.kernel.org/stable/c/2014ac62df9d45bb9a004a043e85df7be09ed780"
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}
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],
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"title": "netfilter: flowtable: publish GC-visible tuple last",
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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-2026-74746",
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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": "2026-10-16T19:16:14.907909Z"
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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": "2026-10-16T19:26:23.781Z"
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}
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}
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]
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}
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} |