195 lines
12 KiB
JSON
195 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-2024-58098",
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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": "2025-03-06T15:52:09.189Z",
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"datePublished": "2025-05-05T14:53:32.417Z",
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"dateUpdated": "2026-10-15T21:51:50.990Z"
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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": "2026-08-05T11:47:43.812Z"
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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\nbpf: track changes_pkt_data property for global functions\n\nWhen processing calls to certain helpers, verifier invalidates all\npacket pointers in a current state. For example, consider the\nfollowing program:\n\n __attribute__((__noinline__))\n long skb_pull_data(struct __sk_buff *sk, __u32 len)\n {\n return bpf_skb_pull_data(sk, len);\n }\n\n SEC(\"tc\")\n int test_invalidate_checks(struct __sk_buff *sk)\n {\n int *p = (void *)(long)sk->data;\n if ((void *)(p + 1) > (void *)(long)sk->data_end) return TCX_DROP;\n skb_pull_data(sk, 0);\n *p = 42;\n return TCX_PASS;\n }\n\nAfter a call to bpf_skb_pull_data() the pointer 'p' can't be used\nsafely. See function filter.c:bpf_helper_changes_pkt_data() for a list\nof such helpers.\n\nAt the moment verifier invalidates packet pointers when processing\nhelper function calls, and does not traverse global sub-programs when\nprocessing calls to global sub-programs. This means that calls to\nhelpers done from global sub-programs do not invalidate pointers in\nthe caller state. E.g. the program above is unsafe, but is not\nrejected by verifier.\n\nThis commit fixes the omission by computing field\nbpf_subprog_info->changes_pkt_data for each sub-program before main\nverification pass.\nchanges_pkt_data should be set if:\n- subprogram calls helper for which bpf_helper_changes_pkt_data\n returns true;\n- subprogram calls a global function,\n for which bpf_subprog_info->changes_pkt_data should be set.\n\nThe verifier.c:check_cfg() pass is modified to compute this\ninformation. The commit relies on depth first instruction traversal\ndone by check_cfg() and absence of recursive function calls:\n- check_cfg() would eventually visit every call to subprogram S in a\n state when S is fully explored;\n- when S is fully explored:\n - every direct helper call within S is explored\n (and thus changes_pkt_data is set if needed);\n - every call to subprogram S1 called by S was visited with S1 fully\n explored (and thus S inherits changes_pkt_data from S1).\n\nThe downside of such approach is that dead code elimination is not\ntaken into account: if a helper call inside global function is dead\nbecause of current configuration, verifier would conservatively assume\nthat the call occurs for the purpose of the changes_pkt_data\ncomputation."
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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 - Exploitation requires loading a crafted eBPF program via the local `bpf(BPF_PROG_LOAD)` syscall and attaching it (tc/XDP/sockmap), all of which are local operations. No remote peer can reach the verifier.\nAC:L - The verifier omission is deterministic — the attacker writes the global subprogram, the bounds check, and the stale-pointer dereference, then triggers it with a packet on an interface they control. No race and no uncontrolled precondition.\nPR:L - The affected program types need CAP_BPF/CAP_NET_ADMIN, but `bpf_token_capable()` evaluates these against `token->userns` through `bpf_ns_capable()`, so BPF-token delegation grants them to an unprivileged process in a user namespace; the same capabilities are commonly held by non-root container-networking daemons.\nUI:N - The attacker loads, attaches, and triggers the program entirely on their own; no victim action of any kind is needed.\nS:U - The corruption is of kernel heap memory within the same kernel security authority — a conventional local privilege-escalation path, with no VM, IOMMU, or sandbox boundary crossed.\nC:H - The stale `PTR_TO_PACKET` dereferences a `kfree()`d `skb->head` (or reads past a shrunk buffer), giving attacker-chosen-offset reads of freed/adjacent kernel heap memory that can be exfiltrated to userspace via a BPF map.\nI:H - The same dangling pointer is writable with attacker-controlled offset and data (`*p = 42` in the PoC), yielding a use-after-free/out-of-bounds kernel heap write primitive that can be groomed into control-flow hijack or privilege escalation.\nA:H - Writing through a freed or out-of-bounds skb data pointer corrupts the slab allocator's state and neighbouring objects, reliably producing an oops or panic even when full exploitation is not achieved."
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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/linux/bpf_verifier.h",
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"kernel/bpf/verifier.c"
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],
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"versions": [
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{
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"version": "51c39bb1d5d105a02e29aa7960f0a395086e6342",
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"lessThan": "79751e9227a5910c0e5a2c7186877d91821d957d",
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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": "51c39bb1d5d105a02e29aa7960f0a395086e6342",
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"lessThan": "1d572c60488b52882b719ed273767ee3b280413d",
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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": "51c39bb1d5d105a02e29aa7960f0a395086e6342",
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"lessThan": "51081a3f25c742da5a659d7fc6fd77ebfdd555be",
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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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"include/linux/bpf_verifier.h",
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"kernel/bpf/verifier.c"
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],
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"versions": [
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{
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"version": "5.6",
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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": "5.6",
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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": "6.6.90",
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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": "6.12.25",
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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": "6.13",
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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": "5.6",
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"versionEndExcluding": "6.6.90"
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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": "5.6",
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"versionEndExcluding": "6.12.25"
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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": "5.6",
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"versionEndExcluding": "6.13"
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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/79751e9227a5910c0e5a2c7186877d91821d957d"
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},
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{
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"url": "https://git.kernel.org/stable/c/1d572c60488b52882b719ed273767ee3b280413d"
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},
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{
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"url": "https://git.kernel.org/stable/c/51081a3f25c742da5a659d7fc6fd77ebfdd555be"
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}
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],
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"title": "bpf: track changes_pkt_data property for global functions",
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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-2024-58098",
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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": "2026-10-15T21:42:18.671562Z"
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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": "2026-10-15T21:51:50.990Z"
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}
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}
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]
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}
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} |