226 lines
12 KiB
JSON
226 lines
12 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-2026-43374",
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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": "2026-05-01T14:12:56.006Z",
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"datePublished": "2026-05-08T14:21:24.537Z",
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"dateUpdated": "2026-10-19T19:16:28.049Z"
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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": "2026-08-05T12:27:34.663Z"
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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\nnet: nexthop: fix percpu use-after-free in remove_nh_grp_entry\n\nWhen removing a nexthop from a group, remove_nh_grp_entry() publishes\nthe new group via rcu_assign_pointer() then immediately frees the\nremoved entry's percpu stats with free_percpu(). However, the\nsynchronize_net() grace period in the caller remove_nexthop_from_groups()\nruns after the free. RCU readers that entered before the publish still\nsee the old group and can dereference the freed stats via\nnh_grp_entry_stats_inc() -> get_cpu_ptr(nhge->stats), causing a\nuse-after-free on percpu memory.\n\nFix by deferring the free_percpu() until after synchronize_net() in the\ncaller. Removed entries are chained via nh_list onto a local deferred\nfree list. After the grace period completes and all RCU readers have\nfinished, the percpu stats are safely freed."
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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 freeing side is reached through `RTM_DELNEXTHOP` over rtnetlink, which is a local netlink configuration interface. Remote packets can hit the RCU read side, but an attacker must locally trigger nexthop deletion to create the UAF.\nAC:L - A local attacker can create nexthop groups, attach routes, generate concurrent route lookups, and delete a member nexthop, controlling both sides of the race. The bug is a straightforward RCU grace-period violation rather than a condition dependent on external state.\nPR:L - The rtnetlink non-GET path requires `CAP_NET_ADMIN` in the socket's network namespace. Because this is reachable with namespaced `CAP_NET_ADMIN` via user/network namespaces on affected systems, this is Low rather than High.\nUI:N - No victim interaction is required once the attacker has local access and the needed namespace capability. The attacker can perform the netlink operations and traffic generation directly.\nS:U - The vulnerability corrupts kernel memory within the same kernel security authority. It is a kernel privilege-impact bug, not a VM escape or cross-scope boundary bypass.\nC:H - This is a use-after-free of per-CPU nexthop group statistics reachable from RCU route readers. Following kernel CVSS guidance, UAF memory corruption is treated as enabling high confidentiality impact.\nI:H - The stale reader writes packet counters and sequence state through a freed per-CPU pointer, creating memory corruption that can plausibly be shaped into write/control-flow impact. Per the required guidance, UAF is scored as High integrity impact.\nA:H - The stale dereference of freed per-CPU memory can crash or otherwise destabilize the kernel. Any kernel UAF with crash potential is High availability impact."
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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/ipv4/nexthop.c"
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],
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"versions": [
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{
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"version": "f4676ea74b8549cd88dbfe2a592ce4530039e61f",
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"lessThan": "abf4feaee6405f1441929c6ebe7a250f2cd170a7",
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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": "f4676ea74b8549cd88dbfe2a592ce4530039e61f",
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"lessThan": "ab5ebab9664214ba41a7633cb4e72f128204f924",
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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": "f4676ea74b8549cd88dbfe2a592ce4530039e61f",
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"lessThan": "9e08ad731862b22a87cc55f752e16d66cdc9e231",
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"status": "affected",
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},
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{
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"version": "f4676ea74b8549cd88dbfe2a592ce4530039e61f",
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"lessThan": "b2662e7593e94ae09b1cf7ee5f09160a3612bcb2",
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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/ipv4/nexthop.c"
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],
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"versions": [
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{
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"version": "6.9",
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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": "6.9",
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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": "6.12.78",
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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": "6.18.19",
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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": "6.19.9",
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"lessThanOrEqual": "6.19.*",
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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": "7.0",
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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": "6.9",
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"versionEndExcluding": "6.12.78"
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},
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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": "6.9",
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.9",
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"versionEndExcluding": "6.19.9"
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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": "6.9",
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"versionEndExcluding": "7.0"
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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/abf4feaee6405f1441929c6ebe7a250f2cd170a7"
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},
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{
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"url": "https://git.kernel.org/stable/c/ab5ebab9664214ba41a7633cb4e72f128204f924"
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},
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{
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"url": "https://git.kernel.org/stable/c/9e08ad731862b22a87cc55f752e16d66cdc9e231"
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},
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{
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"url": "https://git.kernel.org/stable/c/b2662e7593e94ae09b1cf7ee5f09160a3612bcb2"
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}
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],
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"title": "net: nexthop: fix percpu use-after-free in remove_nh_grp_entry",
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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-2026-43374",
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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": "2026-10-16T15:16:55.959084Z"
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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-416",
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"description": "CWE-416 Use After Free"
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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": "2026-10-19T19:16:28.049Z"
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}
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}
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]
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}
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} |