299 lines
16 KiB
JSON
299 lines
16 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-2026-74470",
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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": "2026-08-15T05:44:03.902Z",
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"datePublished": "2026-08-15T12:27:07.504Z",
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"dateUpdated": "2026-10-16T19:05:47.666Z"
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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": "2026-08-23T12:47:20.125Z"
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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\nscsi: scsi_debug: Fix REPORT ZONES alloc_len underflow OOB write\n\nresp_report_zones() sizes the reply buffer from the CDB allocation\nlength. The v3 fix rounds alloc_len up with ALIGN() before deriving the\ndescriptor count:\n\n\trep_max_zones = (ALIGN((u64)alloc_len, RZONES_DESC_HD) -\n\t\t\t RZONES_DESC_HD) >> ilog2(RZONES_DESC_HD);\n\tarr_len = (u64)RZONES_DESC_HD * (rep_max_zones + 1);\n\nFor alloc_len in 0xFFFFFFC1..0xFFFFFFFF, ALIGN() rounds up to\n0x100000000, so arr_len is 4 GB. On 32-bit, kzalloc()'s size_t is 32-bit\nand truncates 0x100000000 to 0; kzalloc(0) returns ZERO_SIZE_PTR, which\npasses the !arr check, and desc = arr + 64 is then dereferenced in the\nloop -> out-of-bounds write / panic.\n\nClamp rep_max_zones to devip->nr_zones. The loop already stops at\nsdebug_capacity (after nr_zones zones), so a report can never hold more\nthan nr_zones descriptors; the clamp does not change the report, it only\nbounds arr_len to (nr_zones + 1) * RZONES_DESC_HD, a real device\nproperty that can never reach 0x100000000."
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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 reached by sending a crafted ZONE IN REPORT ZONES SCSI CDB through local SG_IO/BSG ioctl on a scsi_debug zoned LUN; scsi_debug is a pseudo host simulator with no native network protocol handler.\nAC:L - Once scsi_debug is loaded in host-managed zoned mode, a single REPORT ZONES command with ALLOCATION LENGTH 1-63 reliably underflows rep_max_zones and forces heap writes past a tiny kzalloc buffer; no races or victim-dependent timing are required.\nPR:L - ZBC_IN is whitelisted in scsi_cmd_allowed() without CAP_SYS_RAWIO, so any local user who can open the scsi_debug /dev/sg or BSG node (e.g., disk group) can issue the malicious CDB; module load and zoned setup are environmental, not exploit-time privileges.\nUI:N - Exploitation requires only the attacker issuing SG_IO/BSG with a malicious REPORT ZONES CDB; no separate victim interaction such as mounting media or clicking a prompt is needed.\nS:U - The out-of-bounds write corrupts kernel heap memory in the same host kernel security authority; it is not a VM escape, IOMMU bypass, or other cross-boundary compromise.\nC:H - The kmalloc heap out-of-bounds write can corrupt adjacent slab objects and be groomed into arbitrary kernel memory disclosure primitives; per kernel guidance, exploitable out-of-bounds writes warrant High confidentiality impact.\nI:H - Attacker-controlled REPORT ZONES allocation length drives rep_max_zones and causes repeated 64-byte descriptor writes far beyond the allocated buffer, providing a kernel heap out-of-bounds write suitable for control-data corruption and privilege escalation.\nA:H - Writing zone descriptors from arr+64 when the buffer is smaller than 64 bytes immediately corrupts out-of-bounds kernel memory and commonly triggers KASAN faults, kernel oops, or panic, satisfying High availability impact."
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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/scsi/scsi_debug.c"
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],
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"versions": [
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{
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"version": "ebacb44cb2042b90951140eda806bedad23ef554",
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"lessThan": "7b615fc139e35c81077046df44725c532f7e2404",
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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": "7db0e0c8190a086ef92ce5bb960836cde49540aa",
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"lessThan": "5d3e1d006bbb543259f9e31824caadbfff6a5465",
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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": "7db0e0c8190a086ef92ce5bb960836cde49540aa",
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"lessThan": "49e5b25a0b74dbac595f122e5608fdce2918cc4e",
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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": "7db0e0c8190a086ef92ce5bb960836cde49540aa",
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"lessThan": "495058429ca55ab7fcc21977b63b92907ad68066",
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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": "7db0e0c8190a086ef92ce5bb960836cde49540aa",
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"lessThan": "2047ed09bf13453b7d6f9431b112ec07984dd69b",
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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": "7db0e0c8190a086ef92ce5bb960836cde49540aa",
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"lessThan": "d6e6da6bc3b53231fac77ffab428da8173ee729c",
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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": "7db0e0c8190a086ef92ce5bb960836cde49540aa",
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"lessThan": "93dde0bf2f39a0f9f57fd610aa3201ce5b753433",
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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": "c4d2d7c935a4ad20e8e726ca10499cefe4537103",
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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": "5.15.8",
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"lessThan": "5.15.217",
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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": "5.10.85",
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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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},
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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/scsi/scsi_debug.c"
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],
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"versions": [
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{
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"version": "5.16",
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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": "5.16",
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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": "5.15.217",
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"lessThanOrEqual": "5.15.*",
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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": "6.1.183",
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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": "6.6.151",
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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": "6.12.103",
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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": "6.18.44",
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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": "7.1.8",
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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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],
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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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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/7b615fc139e35c81077046df44725c532f7e2404"
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},
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{
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"url": "https://git.kernel.org/stable/c/5d3e1d006bbb543259f9e31824caadbfff6a5465"
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},
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{
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"url": "https://git.kernel.org/stable/c/49e5b25a0b74dbac595f122e5608fdce2918cc4e"
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},
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{
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"url": "https://git.kernel.org/stable/c/495058429ca55ab7fcc21977b63b92907ad68066"
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},
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{
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"url": "https://git.kernel.org/stable/c/2047ed09bf13453b7d6f9431b112ec07984dd69b"
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},
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{
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"url": "https://git.kernel.org/stable/c/d6e6da6bc3b53231fac77ffab428da8173ee729c"
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},
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{
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"url": "https://git.kernel.org/stable/c/93dde0bf2f39a0f9f57fd610aa3201ce5b753433"
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}
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],
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"title": "scsi: scsi_debug: Fix REPORT ZONES alloc_len underflow OOB write",
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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-2026-74470",
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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": "2026-10-16T18:57:17.506626Z"
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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": "2026-10-16T19:05:47.666Z"
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}
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}
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]
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}
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} |