279 lines
15 KiB
JSON
279 lines
15 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-2026-74565",
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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": "2026-08-15T05:44:03.916Z",
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"datePublished": "2026-08-15T12:28:07.015Z",
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"dateUpdated": "2026-10-21T12:45:59.495Z"
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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": "2026-10-21T12:45:59.495Z"
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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: nf_tables: make nft_object rhltable per table\n\nThe nft_object rhltable is global, this allows for accessing objects\nthat are being dismangled from lookup path by other existing netns.\nGiven the nft_obj_destroy() releases the object inmediately, this might\nlead to use-after-free of these objects that are being released.\nMake the existing rhltable per table to address this issue to deal with\nwith the nft_rcv_nl_event() path too.\n\nUpdate nft_obj_lookup() to take the table as non-const, otherwise,\ncompiler complains when passing the objname_ht to rhltable_lookup()."
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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:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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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:L - The UAF is triggered only through local NETLINK_NETFILTER nftables configuration syscalls (NFT_MSG_NEWOBJ/GETOBJ/DELOBJ and rule/objref setup) that call nft_obj_lookup(); per kernel CNA guidance, nf_tables/netlink is Local, not network-reachable packet processing.\nAC:L - The attacker controls both sides of the race by running concurrent Netlink sockets—one closing to fire nft_rcv_nl_event()/__nft_release_table() object teardown and another issuing object lookups/commits—and can retry until the global rhltable collision-chain walk hits freed memory.\nPR:L - All nf_tables Netlink handlers are gated by netlink_net_capable(skb, CAP_NET_ADMIN) in nfnetlink_rcv(); CAP_NET_ADMIN is obtainable by an unprivileged user inside a user+network namespace (unshare -Urn), not requiring init-namespace root.\nUI:N - No victim interaction is required; exploitation is fully attacker-driven through their own nftables Netlink operations and socket close events without another user mounting, opening files, or taking any action.\nS:U - Impact is kernel heap use-after-free and potential local privilege escalation within the same kernel security authority; this is standard in-kernel memory corruption, not a distinct VM-guest-to-host or sandbox-boundary escape.\nC:H - nft_obj_lookup() holds rcu_read_lock and walks the global rhltable collision chain, dereferencing struct nft_object fields (key.table, ops, genmask) that nft_obj_destroy() may have already kfree'd, giving arbitrary kernel memory read potential from UAF.\nI:H - Immediate kfree after rhltable_remove without waiting for RCU readers enables classic slab UAF heap corruption that can be groomed into arbitrary kernel writes, control-flow hijacking, and local privilege escalation beyond a bounded or transient fault.\nA:H - Concurrent destruction via nft_rcv_nl_event() and active nft_obj_lookup() reliably provokes KASAN-class slab use-after-free kernel oops/panic during rhlist traversal; UAF is inherently crash-prone even when not fully weaponized for code execution."
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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/netfilter/nf_tables.h",
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"net/netfilter/nf_tables_api.c"
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],
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"versions": [
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{
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"version": "4d44175aa5bb5f68772b1eb0306554812294ca52",
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"lessThan": "4b549d32d34ee765527e63726bb1af984876e776",
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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": "4d44175aa5bb5f68772b1eb0306554812294ca52",
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"lessThan": "523c881661dde67efb44fce38c8eed50a72a57c1",
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"status": "affected",
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},
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{
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"version": "4d44175aa5bb5f68772b1eb0306554812294ca52",
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"lessThan": "71714a2cec6c6d79bbd425ad968f9d6a3e4a2066",
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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": "4d44175aa5bb5f68772b1eb0306554812294ca52",
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"lessThan": "1948e4f85b855618b5b9a27265f98d816f4cb7cb",
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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": "4d44175aa5bb5f68772b1eb0306554812294ca52",
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"lessThan": "63ba12b664a2cd3220ed43e22c717715f4cc2ae8",
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"status": "affected",
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"versionType": "git"
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{
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"version": "4d44175aa5bb5f68772b1eb0306554812294ca52",
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"lessThan": "7d4789b58761d9d48d9b5f5e7e0a510c3bbfb3af",
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"status": "affected",
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{
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"lessThan": "f4f699790590bd0896c48a71e9232a65198f92f0",
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"status": "affected",
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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/netfilter/nf_tables.h",
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"net/netfilter/nf_tables_api.c"
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],
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"versions": [
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{
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"version": "5.1",
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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": "5.1",
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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": "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": "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": "6.6.160",
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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": "6.12.103",
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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": "6.18.44",
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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": "7.1.8",
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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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"references": [
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{
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"url": "https://git.kernel.org/stable/c/4b549d32d34ee765527e63726bb1af984876e776"
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"url": "https://git.kernel.org/stable/c/63ba12b664a2cd3220ed43e22c717715f4cc2ae8"
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"url": "https://git.kernel.org/stable/c/f4f699790590bd0896c48a71e9232a65198f92f0"
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}
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],
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"title": "netfilter: nf_tables: make nft_object rhltable per table",
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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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"metrics": [
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{
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"type": "ssvc",
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"content": {
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"id": "CVE-2026-74565",
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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": "no"
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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": "2026-10-16T19:00:18.619077Z"
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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": "2026-10-16T19:05:56.221Z"
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}
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}
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]
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}
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} |