268 lines
13 KiB
JSON
268 lines
13 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-2026-63855",
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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": "2026-07-19T07:54:57.016Z",
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"datePublished": "2026-07-19T14:04:45.096Z",
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"dateUpdated": "2026-10-30T12:27:18.153Z"
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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": "2026-10-30T12:27:18.153Z"
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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\ndrm/amdgpu/vcn: set no_user_fence for VCN v2.5 enc/dec rings\n\nVCN encoder and decoder rings do not support 64-bit user fence writes,\nreject CS submissions with user fences.\n\n(cherry picked from commit efc9dd5590894109bce9a0bfe1fa5592dd6b20b1)"
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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 DRM_AMDGPU_CS ioctl on a /dev/dri/renderD* node; there is no network, Bluetooth, or physical-access attack path to the VCN command submission code.\nAC:L - On affected AMD Instinct MI100 systems, an attacker with render-node access can reliably submit a VCN enc/dec command buffer with a user-fence chunk using standard libdrm/amdgpu APIs, triggering the malformed 64-bit fence write without races or victim-dependent timing.\nPR:L - Exploitation requires opening the DRM render node and submitting GPU commands, which needs only local user privileges (typically membership in the render/video group) on multi-tenant GPU cloud instances, workstations, or containers with GPU access—not root or capabilities obtainable only in the init namespace.\nUI:N - No victim interaction is required; the attacker directly crafts and submits the malicious command submission through the render node without needing another user to open files, mount filesystems, or perform any action.\nS:U - The misdirected GPU fence write corrupts memory within the attacker's own GPU virtual address space on the assigned device; it does not cross a VM, container, or IOMMU security boundary to affect another security authority.\nC:H - The bug causes GPU-initiated writes to an incorrectly decoded address, constituting out-of-bounds memory corruption that can be leveraged to read adjacent GPU-mapped buffers and disclose sensitive data from the attacker's or co-resident GPU allocations.\nI:H - The hardware fence completion write is an attacker-controlled 64-bit store to a mis-decoded GPU virtual address, providing an arbitrary GPU memory write primitive that could corrupt kernel-visible GTT mappings or GPU state for further exploitation.\nA:H - Misdirected fence writes to unmapped or invalid GPU addresses can cause GPU faults, engine hangs, or full GPU resets that deny video codec and compute service on the affected accelerator."
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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/gpu/drm/amd/amdgpu/vcn_v2_5.c"
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],
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"versions": [
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{
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"version": "28c17d72072b7ce5cc13a527dcbfc045cc995e7d",
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"lessThan": "8156e258025f2a22fcf7486c96848ac3cd3541dd",
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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": "28c17d72072b7ce5cc13a527dcbfc045cc995e7d",
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"lessThan": "2c6fb056567efb49f8674108b86088a1cfaa86d0",
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"status": "affected",
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"versionType": "git"
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},
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{
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"lessThan": "8f0ea4524dc71c6c9ec97f2711f46e12f624140f",
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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": "28c17d72072b7ce5cc13a527dcbfc045cc995e7d",
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"lessThan": "602d4c5872b25ddd4d82fb2025efb9a05b187bb3",
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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": "28c17d72072b7ce5cc13a527dcbfc045cc995e7d",
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"lessThan": "5a3c6f76cab164a5d803084908d7050f649ab7f9",
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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": "28c17d72072b7ce5cc13a527dcbfc045cc995e7d",
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"lessThan": "4f317863a3ab212a027d8c8c3cc3af4e3fb95704",
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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/gpu/drm/amd/amdgpu/vcn_v2_5.c"
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],
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"versions": [
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{
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"version": "5.4",
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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": "5.4",
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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": "6.1.191",
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"lessThanOrEqual": "6.1.*",
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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": "6.6.141",
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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": "6.12.91",
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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": "6.18.33",
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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": "7.0.10",
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"lessThanOrEqual": "7.0.*",
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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": "7.1",
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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": "5.4",
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"versionEndExcluding": "6.1.191"
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},
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"vulnerable": true,
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/8156e258025f2a22fcf7486c96848ac3cd3541dd"
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},
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{
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"url": "https://git.kernel.org/stable/c/2c6fb056567efb49f8674108b86088a1cfaa86d0"
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},
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{
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"url": "https://git.kernel.org/stable/c/8f0ea4524dc71c6c9ec97f2711f46e12f624140f"
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},
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{
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"url": "https://git.kernel.org/stable/c/602d4c5872b25ddd4d82fb2025efb9a05b187bb3"
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},
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{
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"url": "https://git.kernel.org/stable/c/5a3c6f76cab164a5d803084908d7050f649ab7f9"
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},
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{
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"url": "https://git.kernel.org/stable/c/4f317863a3ab212a027d8c8c3cc3af4e3fb95704"
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}
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],
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"title": "drm/amdgpu/vcn: set no_user_fence for VCN v2.5 enc/dec rings",
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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-2026-63855",
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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": "2026-10-16T15:32:22.667512Z"
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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-20",
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"description": "CWE-20 Improper Input Validation"
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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": "2026-10-19T20:07:51.946Z"
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}
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}
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]
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}
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} |