226 lines
12 KiB
JSON
226 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-2026-64053",
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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": "2026-07-19T07:54:57.029Z",
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"datePublished": "2026-07-19T15:39:35.854Z",
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"dateUpdated": "2026-10-19T20:28:10.989Z"
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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": "2026-08-05T12:38:43.588Z"
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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\nblock: don't overwrite bip_vcnt in bio_integrity_copy_user()\n\nbio_integrity_add_page() already sets bip_vcnt to 1 for the bounce\nsegment. Overwriting it with nr_vecs breaks bip_vcnt <= bip_max_vcnt\non WRITE (bip_max_vcnt is 1), so the gap-merge checks in block/blk.h\nread past the bip_vec[] flex array. On READ the read is in bounds\nbut lands on a saved user bvec instead of the bounce.\n\nThe line was added for split propagation, but bio_integrity_clone()\ndoesn't copy bip_vcnt and BIP_CLONE_FLAGS excludes BIP_COPY_USER."
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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 bug is only reachable via local syscalls on an integrity-capable block device—io_uring read/write with PI attributes (`IOCB_HAS_METADATA` → `bio_integrity_map_iter()`) or NVMe ioctls (`NVME_IOCTL_SUBMIT_IO`/`NVME_IOCTL_IO_CMD` → `blk_rq_integrity_map_user()`). No network-facing server path (ksmbd, nfsd, nvmet) calls `bio_integrity_copy_user()`.\nAC:L - An attacker fully controls the conditions needed to hit the copy path and trigger the bad index: misaligned or multi-segment integrity user buffers force `copy=true`, multi-page scatter yields `nr_bvecs>1`, and concurrent O_DIRECT integrity writes to the same queue trigger `integrity_req_gap_*_merge()` that dereferences the corrupted `bip_vcnt`.\nPR:L - No kernel capabilities or init-namespace root are required beyond permission to open and perform O_DIRECT I/O on an integrity-enabled block device (`/dev/nvme*`, SCSI DIF disk); io_uring and NVMe ioctls are available to any local user granted device access (e.g., disk group, container volume mounts on storage nodes).\nUI:N - Exploitation is self-initiated by the attacker issuing crafted integrity I/O; no victim interaction such as mounting a filesystem or opening a file is required.\nS:U - Impact is confined to kernel memory safety within the block-integrity path on the host; it does not cross a VM, IOMMU, or sandbox security boundary.\nC:H - On WRITE, `bip_vcnt` is incorrectly set to `nr_vecs` while `bip_max_vcnt` is 1, so `integrity_req_gap_back_merge()`/`integrity_req_gap_front_merge()` in `block/blk.h` index `bip_vec[bip_vcnt-1]` past the single-slot kmalloc flex array, causing an out-of-bounds read of adjacent kernel heap memory that can disclose kernel pointers and other sensitive data.\nI:H - The corrupted `bip_vcnt` breaks integrity metadata bookkeeping during bio/request merging; on READ it causes gap-merge logic to consult saved user bvecs instead of the kernel bounce buffer, and the heap OOB read corrupts kernel memory-safety invariants in ways that can be chained toward further memory corruption or control-flow manipulation.\nA:H - With large `nr_bvecs` (up to `BIO_MAX_VECS`), the out-of-bounds `bip_vec` access can extend far beyond the kmalloc object boundary and provoke a kernel oops/page fault during merge processing; even without full exploitation, the integrity path malfunction can destabilize the I/O stack."
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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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"block/bio-integrity.c"
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],
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"versions": [
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{
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"version": "3991657ae7074c3c497bf095093178bed37ea1b4",
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"lessThan": "d18160c9525c63c203656fefd847e94b538cd4a4",
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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": "3991657ae7074c3c497bf095093178bed37ea1b4",
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"lessThan": "0d48654af4d1390c888389206cc13b51b82c30e6",
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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": "3991657ae7074c3c497bf095093178bed37ea1b4",
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"lessThan": "066be1439593a381b1a29663becfcfe0c92363e7",
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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": "3991657ae7074c3c497bf095093178bed37ea1b4",
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"lessThan": "637ad3a56a3b889527d1dacea6fea2a8bd648140",
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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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"block/bio-integrity.c"
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],
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"versions": [
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{
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"version": "6.11",
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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": "6.11",
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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": "6.12.92",
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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": "6.18.34",
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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": "7.0.11",
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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": "6.11",
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"versionEndExcluding": "6.12.92"
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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": "6.11",
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"versionEndExcluding": "6.18.34"
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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": "6.11",
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"versionEndExcluding": "7.0.11"
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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": "6.11",
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"versionEndExcluding": "7.1"
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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/d18160c9525c63c203656fefd847e94b538cd4a4"
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},
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{
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"url": "https://git.kernel.org/stable/c/0d48654af4d1390c888389206cc13b51b82c30e6"
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},
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{
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"url": "https://git.kernel.org/stable/c/066be1439593a381b1a29663becfcfe0c92363e7"
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},
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{
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"url": "https://git.kernel.org/stable/c/637ad3a56a3b889527d1dacea6fea2a8bd648140"
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}
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],
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"title": "block: don't overwrite bip_vcnt in bio_integrity_copy_user()",
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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-2026-64053",
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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": "2026-10-16T15:36:00.465098Z"
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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-125",
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"description": "CWE-125 Out-of-bounds Read"
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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": "2026-10-19T20:28:10.989Z"
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}
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}
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]
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}
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} |