200 lines
11 KiB
JSON
200 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-2024-56669",
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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": "2024-12-27T15:00:39.844Z",
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"datePublished": "2024-12-27T15:06:30.792Z",
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"dateUpdated": "2026-08-05T11:45:59.525Z"
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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": "2026-08-05T11:45:59.525Z"
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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\niommu/vt-d: Remove cache tags before disabling ATS\n\nThe current implementation removes cache tags after disabling ATS,\nleading to potential memory leaks and kernel crashes. Specifically,\nCACHE_TAG_DEVTLB type cache tags may still remain in the list even\nafter the domain is freed, causing a use-after-free condition.\n\nThis issue really shows up when multiple VFs from different PFs\npassed through to a single user-space process via vfio-pci. In such\ncases, the kernel may crash with kernel messages like:\n\n BUG: kernel NULL pointer dereference, address: 0000000000000014\n PGD 19036a067 P4D 1940a3067 PUD 136c9b067 PMD 0\n Oops: Oops: 0000 [#1] PREEMPT SMP NOPTI\n CPU: 74 UID: 0 PID: 3183 Comm: testCli Not tainted 6.11.9 #2\n RIP: 0010:cache_tag_flush_range+0x9b/0x250\n Call Trace:\n <TASK>\n ? __die+0x1f/0x60\n ? page_fault_oops+0x163/0x590\n ? exc_page_fault+0x72/0x190\n ? asm_exc_page_fault+0x22/0x30\n ? cache_tag_flush_range+0x9b/0x250\n ? cache_tag_flush_range+0x5d/0x250\n intel_iommu_tlb_sync+0x29/0x40\n intel_iommu_unmap_pages+0xfe/0x160\n __iommu_unmap+0xd8/0x1a0\n vfio_unmap_unpin+0x182/0x340 [vfio_iommu_type1]\n vfio_remove_dma+0x2a/0xb0 [vfio_iommu_type1]\n vfio_iommu_type1_ioctl+0xafa/0x18e0 [vfio_iommu_type1]\n\nMove cache_tag_unassign_domain() before iommu_disable_pci_caps() to fix\nit."
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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:C/C:H/I:H/A:H",
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"baseScore": 8.8,
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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 vulnerable path is reached through local VFIO/iommufd ioctls (device attach/detach followed by VFIO_IOMMU_UNMAP_DMA), as shown by the reported call trace through vfio_iommu_type1_ioctl. No network or physical access is involved.\nAC:L - This is a deterministic ordering bug, not a race: any attach/detach cycle of an ATS-capable device unconditionally orphans the CACHE_TAG_DEVTLB tag, and the attacker fully controls both the detach and the subsequent unmap that walks the stale tag.\nPR:L - An unprivileged local user granted access to a VFIO group/cdev — the explicitly supported \"safe userspace driver\" model used by DPDK, SPDK and QEMU/libvirt-assigned devices — can perform the attach/detach and unmap ioctls that trigger the stale tag, requiring only low privileges rather than real root.\nUI:N - The attacker's own sequence of ioctls on its VFIO container triggers the orphaned cache tag and the subsequent dereference; no action by any other user or administrator is needed.\nS:C - The defect is in the VT-d device-TLB invalidation tracking that enforces DMA isolation, and the corrupted tag causes ATS invalidation descriptors to be programmed into the IOMMU hardware from NULL/freed device_domain_info, affecting the DMA/IOMMU boundary that protects host memory from passthrough devices and their assigned guest owners.\nC:H - The stale tag causes a use-after-free read of the freed device_domain_info (and the freed struct device's dev_iommu), so heap-groomed contents of a reclaimed slab object are read out and used to construct hardware invalidation descriptors, giving an attacker-influenced read primitive against freed kernel memory.\nI:H - The use-after-free lets an attacker spray the reclaimed device_domain_info slot so that bus/devfn/pfsid/ats_qdep values under their control are written into queued-invalidation descriptors submitted to the IOMMU, and per standard treatment a UAF of this kind is leverageable for kernel memory corruption.\nA:H - The bug reproducibly panics the kernel — the reporter's NULL pointer dereference at address 0x14 in cache_tag_flush_range with multiple VFs passed through via vfio-pci — and the leaked cache tags additionally accumulate unbounded on every attach/detach cycle."
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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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"drivers/iommu/intel/iommu.c"
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],
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"versions": [
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{
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"version": "3b1d9e2b2d6856eabf5faa12d20c97fef657999f",
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"lessThan": "9a0a72d3ed919ebe6491f527630998be053151d8",
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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": "3b1d9e2b2d6856eabf5faa12d20c97fef657999f",
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"lessThan": "1f2557e08a617a4b5e92a48a1a9a6f86621def18",
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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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"drivers/iommu/intel/iommu.c"
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],
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"versions": [
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{
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"version": "6.10",
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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": "6.10",
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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": "6.12.6",
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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": "6.10",
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"versionEndExcluding": "6.12.6"
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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": "6.10",
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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/9a0a72d3ed919ebe6491f527630998be053151d8"
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},
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{
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"url": "https://git.kernel.org/stable/c/1f2557e08a617a4b5e92a48a1a9a6f86621def18"
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}
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],
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"title": "iommu/vt-d: Remove cache tags before disabling ATS",
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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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"cvssV3_1": {
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"scope": "UNCHANGED",
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"version": "3.1",
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"baseScore": 7.8,
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"attackVector": "LOCAL",
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"baseSeverity": "HIGH",
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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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"integrityImpact": "HIGH",
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"userInteraction": "NONE",
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"attackComplexity": "LOW",
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"availabilityImpact": "HIGH",
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"privilegesRequired": "LOW",
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"confidentialityImpact": "HIGH"
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}
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},
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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-2024-56669",
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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": "2025-02-11T15:41:33.499113Z"
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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": "2025-02-11T15:45:21.237Z"
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}
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}
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]
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}
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} |