352 lines
18 KiB
JSON
352 lines
18 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-2026-74365",
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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": "2026-08-15T05:44:03.888Z",
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"datePublished": "2026-08-15T05:58:47.594Z",
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"dateUpdated": "2026-10-16T18:55:35.765Z"
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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": "2026-08-17T05:46:24.251Z"
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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\nnvdimm/btt: Handle preemption in BTT lane acquisition\n\nBTT lanes serialize access to per-lane metadata and workspace state\nduring BTT I/O. The btt-check unit test reports data mismatches during\nBTT writes due to a race in lane acquisition that can lead to silent\ndata corruption.\n\nThe existing lane model uses a spinlock together with a per-CPU\nrecursion count. That recursion model stopped being valid after BTT\nlanes became preemptible: another task can run on the same CPU,\nobserve a non-zero recursion count, bypass locking, and use the same\nlane concurrently.\n\nBTT lanes are also held across arena_write_bytes() calls. That path\nreaches nsio_rw_bytes(), which flushes writes with nvdimm_flush().\nSome provider flush callbacks can sleep, making a spinlock the wrong\nprimitive for the lane lifetime.\n\nReplace the spinlock-based recursion model with a dynamically\nallocated per-lane mutex array and take the lane lock\nunconditionally.\n\nAdd might_sleep() to catch any future atomic-context caller.\n\nFound with the ndctl unit test btt-check.sh."
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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:L",
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"baseScore": 7.3,
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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 reached only through local block I/O on a BTT-backed /dev/pmem* device via vfs_write/pwrite/O_DIRECT paths into btt_submit_bio->btt_write_pg/btt_read_pg->nd_region_acquire_lane; it is not in a network protocol handler.\nAC:L - After BTT lanes became preemptible, a second task on the same CPU can bypass the per-CPU recursion spinlock while the first still holds the lane across sleeping arena_write_bytes/nvdimm_flush; an attacker reliably wins by issuing concurrent writes (e.g., many threads) to the BTT block device.\nPR:L - No capability checks exist on the bio submission path; any local principal with write access to the BTT block device or a filesystem mounted on it (common for database/service accounts on PMEM servers) can trigger the race without real init-namespace root.\nUI:N - Exploitation requires only automated concurrent block writes from the attacker-controlled process and does not depend on any victim user opening files, clicking prompts, or performing other interactive actions.\nS:U - Impact is confined to corrupting BTT metadata and data within the attacker's reachable persistent-memory namespace on the same host; it does not cross VM, container, or IOMMU security boundaries to affect other security authorities.\nC:H - Unserialized lane use corrupts BTT map/log/freelist and in-memory arena->rtt/freelist state, so reads can return stale or mis-mapped sector contents (cross-LBA disclosure); the ndctl btt-check test observed data mismatches confirming readable integrity loss.\nI:H - Concurrent writers can silently corrupt on-media BTT translation tables and user data blocks, producing arbitrary persistent storage modification rather than a bounded or detectable single-field change, matching the fix commit's silent data-corruption description.\nA:L - The primary failure mode is silent corruption and subsequent I/O errors on the affected namespace rather than a kernel panic or hang, but corrupted BTT metadata can persistently degrade or deny reliable access to the volume until recovery or rebuild."
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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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"Documentation/driver-api/nvdimm/btt.rst",
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"drivers/nvdimm/nd.h",
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"drivers/nvdimm/region_devs.c"
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],
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"versions": [
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{
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"version": "f23859748e3d530217b197e146a9ac84faf0a282",
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"lessThan": "fd7a97b2514cfc4b4cc067a27dd39bde2a8b1735",
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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": "6f50b414f1a0d790f11a6438a3ad6d0577eb2c18",
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"lessThan": "73e35c1bdfa160b41fdbe204e02325f0687de506",
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"status": "affected",
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},
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"version": "36c75ce3bd299878fd9b238e9803d3817ddafbf3",
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"status": "affected",
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"status": "affected",
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},
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{
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"version": "40ba3fa21250e361bdd8f00800b3e2cb6160de95",
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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": "b0e7a935739f33ed2bd6868b89f97dd4c2683c26",
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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": "66eb7b7f23dd9aec5356e7054dd3596ae7648ff5",
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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": "b27751fb1f271bbb78d5993c0b10011628e40e18",
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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": "6.1.63",
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"lessThan": "6.1.178",
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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": "6.6.2",
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"lessThan": "6.6.145",
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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": "4.19.299",
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"lessThan": "4.20",
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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": "5.4.261",
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"lessThan": "5.5",
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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": "5.10.201",
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"lessThan": "5.11",
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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": "5.15.139",
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"lessThan": "5.16",
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"status": "affected",
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},
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{
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"version": "6.5.12",
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"lessThan": "6.6",
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"status": "affected",
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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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"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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"Documentation/driver-api/nvdimm/btt.rst",
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"drivers/nvdimm/nd.h",
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"drivers/nvdimm/region_devs.c"
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],
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"versions": [
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{
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"version": "6.7",
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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": "6.7",
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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": "6.1.178",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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},
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{
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"version": "6.6.145",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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},
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{
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"version": "6.12.97",
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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": "6.18.40",
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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": "7.1.5",
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"lessThanOrEqual": "7.1.*",
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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": "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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"cpeApplicability": [
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"nodes": [
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/fd7a97b2514cfc4b4cc067a27dd39bde2a8b1735"
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},
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{
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"url": "https://git.kernel.org/stable/c/73e35c1bdfa160b41fdbe204e02325f0687de506"
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},
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{
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"url": "https://git.kernel.org/stable/c/417918783bcfe0be135019df16a267b3af442efd"
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},
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{
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"url": "https://git.kernel.org/stable/c/5c53406098b599c420b031e6ec5ba8a2f3794c50"
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},
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{
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"url": "https://git.kernel.org/stable/c/4eafa810b042d985ec6bbf5b514414e73cee6f6f"
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},
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{
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"url": "https://git.kernel.org/stable/c/8d4b989d9c9afe5f185aa5853b666fc4617afe9e"
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}
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],
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"title": "nvdimm/btt: Handle preemption in BTT lane acquisition",
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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-2026-74365",
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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": "2026-10-16T18:54:37.742896Z"
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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": "2026-10-16T18:55:35.765Z"
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}
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}
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]
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}
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} |