291 lines
15 KiB
JSON
291 lines
15 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-2026-68107",
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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": "2026-07-30T09:28:09.368Z",
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"datePublished": "2026-08-10T11:58:24.135Z",
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"dateUpdated": "2026-10-30T12:28:05.347Z"
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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": "2026-10-30T12:28:05.347Z"
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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/vcn4: avoid rereading IB param length\n\nReuse the parameter length returned by\nvcn_v4_0_enc_find_ib_param() instead of rereading it from\nthe IB.\n\nThis avoids a potential TOCTOU issue if the IB contents\nchange between reads.\n\n(cherry picked from commit dbb02b4755f8c1f3773263f2d779872c1c0c073a)"
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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 flaw is only reachable through the local AMDGPU_CS DRM ioctl on /dev/dri/renderD* (amdgpu_cs_ioctl → amdgpu_cs_patch_jobs → amdgpu_cs_patch_ibs), which kmaps the user IB and calls vcn_v4_0_ring_patch_cs_in_place(); no network or physical-device path exists.\nAC:L - patch_cs_in_place reads IB contents directly from attacker-mapped GEM memory without copying; a concurrent thread can change the param-length dword between vcn_v4_0_enc_find_ib_param()'s initial read and the later idx+=amdgpu_ib_get_value(ib,idx)/4, so the attacker controls both sides of the TOCTOU race.\nPR:L - AMDGPU_CS is registered with DRM_AUTH|DRM_RENDER_ALLOW, so any local user who can open the AMDGPU render node (typical render/video group on desktops, gaming handhelds, and GPU cloud instances) can submit VCN4 command buffers without root or init-namespace capabilities.\nUI:N - Exploitation requires only the attacker submitting crafted VCN encode IBs through their own DRM context; no separate victim action such as opening a file, mounting a filesystem, or interacting with malicious content is needed.\nS:C - On VFIO GPU-passthrough and cloud ML hosts, a malicious VM guest submits VCN command streams through the assigned AMD GPU to corrupt host amdgpu kernel state, crossing the guest-to-hypervisor security boundary analogous to a device-model escape.\nC:H - Racing the length dword smaller under-advances IB iteration so nested RADEON_VCN_ENGINE_INFO entries inside a parent package are reached; vcn_v4_0_dec_msg() then reads user-mapped message buffers without snapshotting, enabling TOCTOU check/use mismatches on length/offset fields and out-of-bounds kernel reads past validated bounds.\nI:H - The same nested-entry bypass plus unsnapshotted dec_msg parsing lets userspace rewrite offset/size after kernel validation, driving out-of-bounds accesses in the message loop; skipping vcn_v4_0_limit_sched() via mis-iteration also leaves scheduler/BO state inconsistently modified in attacker-influenceable ways.\nA:H - Racing the length field to zero on re-read makes idx+=0 and re-enters the same ENGINE_INFO entry indefinitely, soft-locking the CS ioctl path; vcn_v4_0_limit_sched() may also block in dma_fence_wait(), yielding repeatable kernel denial-of-service on shared GPU hosts."
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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_v4_0.c"
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],
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"versions": [
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{
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"version": "cfdde9197ecd957281507be99af172671a57755c",
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"lessThan": "bbbe6a2a8d8dc87243438d3ffea2083b52d882d9",
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"status": "affected",
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},
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{
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"version": "6dc4eddeb7e6cca7e1ab32cafbda79d06e652d84",
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"lessThan": "ff6aa542d91d76a185f69bd1997b94a560ff5f6b",
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"status": "affected",
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},
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{
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"version": "2b10cb58d7a3fd621ec9b2ba765a092e562ef998",
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"lessThan": "bd868c077f67589ed2a714307ceaade5f246e302",
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"status": "affected",
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"status": "affected",
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"status": "affected",
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{
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"version": "d19dd814b5b7dd9bfc288308a69cb29528f041fd",
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"status": "affected",
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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": "6.6.107",
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"lessThan": "6.6.148",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "6.12.48",
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"lessThan": "6.12.101",
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"status": "affected",
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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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"lessThan": "6.2",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "6.16.8",
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"lessThan": "6.17",
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"status": "affected",
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"versionType": "semver"
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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_v4_0.c"
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],
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"versions": [
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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": "6.17",
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"status": "unaffected",
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},
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{
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"version": "6.6.148",
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"lessThanOrEqual": "6.6.*",
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},
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{
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"version": "6.12.101",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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},
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{
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"version": "6.18.42",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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},
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{
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"version": "7.1.6",
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"lessThanOrEqual": "7.1.*",
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"status": "unaffected",
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},
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{
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"version": "7.2",
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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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"references": [
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"url": "https://git.kernel.org/stable/c/bbbe6a2a8d8dc87243438d3ffea2083b52d882d9"
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"url": "https://git.kernel.org/stable/c/bd868c077f67589ed2a714307ceaade5f246e302"
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}
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],
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"title": "drm/amdgpu/vcn4: avoid rereading IB param length",
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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-2026-68107",
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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": "2026-10-16T15:43:57.531323Z"
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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-367",
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"description": "CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition"
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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": "2026-10-19T20:58:50.974Z"
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}
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}
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]
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} |