216 lines
12 KiB
JSON
216 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-2025-39990",
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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": "2025-04-16T07:20:57.150Z",
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"datePublished": "2025-10-15T07:56:07.295Z",
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"dateUpdated": "2026-10-21T12:37:41.130Z"
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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": "2026-10-21T12:37:41.130Z"
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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: Check the helper function is valid in get_helper_proto\n\nkernel test robot reported verifier bug [1] where the helper func\npointer could be NULL due to disabled config option.\n\nAs Alexei suggested we could check on that in get_helper_proto\ndirectly. Marking tail_call helper func with BPF_PTR_POISON,\nbecause it is unused by design.\n\n [1] https://lore.kernel.org/oe-lkp/202507160818.68358831-lkp@intel.com"
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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 vulnerability is reached only through the local `bpf(BPF_PROG_LOAD)` syscall, which is used to submit the crafted program to the verifier. There is no remote or adjacent-network path into `get_helper_proto()`.\nAC:L - On an affected build the attacker deterministically triggers the bug every time by loading a program that calls a helper whose weak proto is zeroed — no race, no memory-layout dependency, no unpredictable state. Both the `verifier_bug()` WARN path and the `bpf_get_branch_snapshot` inline path are fully under the attacker's control via the program bytecode.\nPR:L - Program load plus `CAP_PERFMON`/`CAP_BPF` is required, but `CAP_PERFMON` is a narrow, non-root capability commonly granted to unprivileged profiling and BPF observability daemons, and `bpf_token_capable()` explicitly makes it delegable to unprivileged users inside user namespaces via bpffs BPF tokens. This is an ordinary low-privileged account boundary, not init-namespace root.\nUI:N - The attacker loads and exercises the BPF program entirely on their own; no other user or administrator has to perform any action.\nS:U - The corruption and the crash both occur inside the kernel that is already the security authority for the calling process — a conventional local kernel privilege-escalation/DoS, with no VM, IOMMU, or sandbox boundary crossed.\nC:H - With all `arg_type[]` zeroed to `ARG_DONTCARE` the verifier validates nothing, and the inlined `bpf_get_branch_snapshot` copies LBR records (kernel from/to instruction pointers) to an attacker-chosen destination that can be a readable BPF map value, disclosing kernel text addresses and defeating KASLR; the same unvalidated-pointer primitive generalizes to broader kernel memory disclosure.\nI:H - `__intel_pmu_snapshot_branch_stack()` performs `memcpy(entries, cpuc->lbr_entries, 24 * cnt)` with `entries` an entirely unvalidated attacker-supplied scalar, giving an arbitrary kernel-memory write of up to several hundred bytes — a direct privilege-escalation primitive.\nA:H - The common path hits `verifier_bug()` → `BPF_WARN_ONCE`, which taints the kernel and panics outright on the many hardened/production and Android kernels that set `panic_on_warn=1`; the arbitrary-write path trivially oopses the kernel by targeting unmapped or critical memory."
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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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"kernel/bpf/core.c",
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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": "f470378c7562a2818b45ed11c98973f2b89eedd3",
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"lessThan": "dfbff47f120e4b0793ca0e0b8660361ccac25a74",
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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": "f470378c7562a2818b45ed11c98973f2b89eedd3",
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"lessThan": "3d429cb1278e995e22995ef117fa96d223a67e93",
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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": "f470378c7562a2818b45ed11c98973f2b89eedd3",
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"lessThan": "6233715b4b714068d6c831d214a4e8792109875a",
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"status": "affected",
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"lessThan": "e4414b01c1cd9887bbde92f946c1ba94e40d6d64",
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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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"kernel/bpf/core.c",
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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": "5.8",
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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": "5.8",
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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": "6.12.50",
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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": "6.16.10",
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"lessThanOrEqual": "6.16.*",
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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": "6.17",
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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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"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": "5.8",
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"versionEndExcluding": "6.6.160"
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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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"versionEndExcluding": "6.16.10"
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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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}
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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/dfbff47f120e4b0793ca0e0b8660361ccac25a74"
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},
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{
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"url": "https://git.kernel.org/stable/c/3d429cb1278e995e22995ef117fa96d223a67e93"
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},
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{
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"url": "https://git.kernel.org/stable/c/6233715b4b714068d6c831d214a4e8792109875a"
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},
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{
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"url": "https://git.kernel.org/stable/c/e4414b01c1cd9887bbde92f946c1ba94e40d6d64"
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}
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],
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"title": "bpf: Check the helper function is valid in get_helper_proto",
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"x_generator": {
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"engine": "bippy-1.2.0"
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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-2025-39990",
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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": "2026-10-15T21:55:55.410522Z"
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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": "2026-10-15T22:02:35.724Z"
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} |