214 lines
11 KiB
JSON
214 lines
11 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-2025-40266",
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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": "2025-04-16T07:20:57.183Z",
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"datePublished": "2025-12-04T16:08:25.392Z",
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"dateUpdated": "2026-08-05T12:09:01.305Z"
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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": "2026-08-05T12:09:01.305Z"
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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\nKVM: arm64: Check the untrusted offset in FF-A memory share\n\nVerify the offset to prevent OOB access in the hypervisor\nFF-A buffer in case an untrusted large enough value\n[U32_MAX - sizeof(struct ffa_composite_mem_region) + 1, U32_MAX]\nis set from the host kernel."
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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:H/UI:N/S:C/C:H/I:H/A:H",
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"baseScore": 8.2,
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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 vulnerable code is the EL2 FF-A proxy, reached only via an SMC trapped from host EL1 with a host-supplied TX mailbox; this requires local execution on the machine, with no network or physical vector.\nAC:L - The host kernel fully controls the SMC registers (len/fraglen) and every byte of the TX buffer including composite_off, so the condition is set deterministically with no race or memory-layout dependency.\nPR:H - SMC is undefined at EL0 and no userspace FF-A interface exists, so the attacker must already execute code in the host kernel at EL1 — real root plus kernel-level access, not reachable through user namespaces.\nUI:N - The attacker issues the FFA_MEM_SHARE/FFA_MEM_LEND SMC itself; no victim action or interaction of any kind is needed.\nS:C - The vulnerable component is the pKVM EL2 hypervisor, a distinct security authority whose purpose is isolating protected guest VMs and the secure world from the untrusted host; corrupting it impacts resources beyond the host kernel's own authority.\nC:H - The out-of-bounds read extends far past the single-page hyp TX buffer with attacker-chosen displacement and unbounded length, and the OOB contents drive observable host-page sharing decisions, forming a disclosure oracle over hypervisor-private memory.\nI:H - Out-of-bounds constituent data is passed to __pkvm_host_share_ffa(), corrupting the hypervisor's page-ownership state and defeating the FF-A filter that prevents host-mediated exposure of protected guest memory to the secure world.\nA:H - Walking hundreds of millions of constituents past a one-page EL2 mapping faults in the hypervisor, causing hyp_panic and taking down the host and every guest on the system."
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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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"arch/arm64/kvm/hyp/nvhe/ffa.c"
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],
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"versions": [
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{
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"version": "6211753fdfd05af9e08f54c8d0ba3ee516034878",
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"lessThan": "fc3139d9f4c1fe1c7d5f25f99676bd8e9c6a1041",
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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": "6211753fdfd05af9e08f54c8d0ba3ee516034878",
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"lessThan": "bc1909ef38788f2ee3d8011d70bf029948433051",
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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": "6211753fdfd05af9e08f54c8d0ba3ee516034878",
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"lessThan": "f9f1aed6c8a3427900da3121e1868124854569c3",
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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": "6211753fdfd05af9e08f54c8d0ba3ee516034878",
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"lessThan": "103e17aac09cdd358133f9e00998b75d6c1f1518",
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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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"arch/arm64/kvm/hyp/nvhe/ffa.c"
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],
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"versions": [
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{
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"version": "3.11",
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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": "3.11",
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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": "6.6.118",
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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": "6.12.60",
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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": "6.17.10",
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"lessThanOrEqual": "6.17.*",
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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",
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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": "3.11",
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"versionEndExcluding": "6.6.118"
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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": "3.11",
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"versionEndExcluding": "6.12.60"
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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": "3.11",
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"versionEndExcluding": "6.17.10"
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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": "3.11",
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"versionEndExcluding": "6.18"
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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/fc3139d9f4c1fe1c7d5f25f99676bd8e9c6a1041"
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},
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{
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"url": "https://git.kernel.org/stable/c/bc1909ef38788f2ee3d8011d70bf029948433051"
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},
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{
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"url": "https://git.kernel.org/stable/c/f9f1aed6c8a3427900da3121e1868124854569c3"
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},
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{
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"url": "https://git.kernel.org/stable/c/103e17aac09cdd358133f9e00998b75d6c1f1518"
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}
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],
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"title": "KVM: arm64: Check the untrusted offset in FF-A memory share",
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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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"timestamp": "2026-06-16T19:59:35.285244Z",
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"id": "CVE-2025-40266",
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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": "partial"
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}
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],
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"role": "CISA Coordinator",
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"version": "2.0.3"
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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": "2026-06-16T19:59:44.078Z"
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}
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}
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]
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}
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} |