262 lines
14 KiB
JSON
262 lines
14 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-2026-43067",
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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": "2026-05-01T14:12:55.981Z",
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"datePublished": "2026-05-05T15:23:26.717Z",
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"dateUpdated": "2026-10-19T19:06:12.380Z"
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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": "2026-08-05T12:25:42.475Z"
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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\next4: handle wraparound when searching for blocks for indirect mapped blocks\n\nCommit 4865c768b563 (\"ext4: always allocate blocks only from groups\ninode can use\") restricts what blocks will be allocated for indirect\nblock based files to block numbers that fit within 32-bit block\nnumbers.\n\nHowever, when using a review bot running on the latest Gemini LLM to\ncheck this commit when backporting into an LTS based kernel, it raised\nthis concern:\n\n If ac->ac_g_ex.fe_group is >= ngroups (for instance, if the goal\n group was populated via stream allocation from s_mb_last_groups),\n then start will be >= ngroups.\n\n Does this allow allocating blocks beyond the 32-bit limit for\n indirect block mapped files? The commit message mentions that\n ext4_mb_scan_groups_linear() takes care to not select unsupported\n groups. However, its loop uses group = *start, and the very first\n iteration will call ext4_mb_scan_group() with this unsupported\n group because next_linear_group() is only called at the end of the\n iteration.\n\nAfter reviewing the code paths involved and considering the LLM\nreview, I determined that this can happen when there is a file system\nwhere some files/directories are extent-mapped and others are\nindirect-block mapped. To address this, add a safety clamp in\next4_mb_scan_groups()."
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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:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 9.8,
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"baseSeverity": "CRITICAL"
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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:N - In a reasonable high-impact deployment, a writable ext4 filesystem can be exported by in-kernel NFS or ksmbd, whose WRITE handlers enter the same VFS/ext4 allocation path. Local writes also reach it, but network is the highest defensible vector for an exported writable share.\nAC:L - Once the affected large mixed-format ext4 filesystem state exists, triggering is a normal file allocation/write path with no race or probabilistic memory condition. The attacker can drive stream allocation and indirect-file allocation through repeated writes.\nPR:N - A writable anonymous or guest NFS/SMB export can reach the vulnerable write path without local credentials or kernel capabilities. Even locally, only ordinary write permission to an affected file is needed, not administrative privilege.\nUI:N - No victim action is required after the vulnerable filesystem/share is available. The attacker triggers allocation directly by writing data.\nS:U - The impact remains within the kernel/filesystem security authority. This is not a VM escape, IOMMU bypass, or cross-authority sandbox escape.\nC:H - The bug can allocate a physical block above the 32-bit indirect-block limit and then store it through a 32-bit indirect pointer, wrapping the file mapping to another on-disk block. That can expose arbitrary file data from the same filesystem through the attacker's file.\nI:H - The wrapped indirect pointer can make attacker writes target blocks that were not actually allocated to the file. This can overwrite other file data or corrupt the filesystem.\nA:H - Filesystem corruption can make data unavailable and can force ext4 errors or read-only/remediation states. Repeated writes can reliably recreate the corruption on an affected deployment."
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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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"fs/ext4/mballoc.c"
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],
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"versions": [
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{
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"version": "9d89b9d55e25cb340c5b4b769876edc551b7a9ff",
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"lessThan": "f89bba144938921a2249237ad04a0183ff3f8930",
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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": "1b0edd6022a3f44ce87fea9959a9310f4628fbea",
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"lessThan": "83170a05908b6cf2fb3235d3065bf613ff866f3c",
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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": "9eea2f57d11b30049ff996ac3eff6e0dc8089e5f",
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"lessThan": "4bec4a498ce86314d470ae6144120461f2138c29",
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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": "34c803edc0b3365a42efcf9815acab63b4cf54e0",
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"lessThan": "12624c5b724a81e14e532972b40d863b0de3b7d1",
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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": "321ed8d559c951e71ad2d2d69a4cf0445644e865",
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"lessThan": "2a368ccddfc492a0aa951e2caef2985f20e96503",
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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": "4865c768b563deff1b6a6384e74a62f143427b42",
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"lessThan": "bb81702370fad22c06ca12b6e1648754dbc37e0f",
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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": "16fce6b6c0b247258c6c217fce5a48abf50f6964",
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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": "5.15.203",
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"lessThan": "5.16",
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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": "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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"fs/ext4/mballoc.c"
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],
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"versions": [
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{
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"version": "6.1.167",
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"lessThan": "6.1.168",
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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": "6.6.130",
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"lessThan": "6.6.134",
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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": "6.12.77",
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"lessThan": "6.12.80",
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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": "6.18.14",
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"lessThan": "6.18.21",
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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": "6.19.4",
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"lessThan": "6.19.11",
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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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"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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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.1.167",
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"versionEndExcluding": "6.1.168"
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},
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"vulnerable": true,
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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/f89bba144938921a2249237ad04a0183ff3f8930"
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},
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{
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"url": "https://git.kernel.org/stable/c/83170a05908b6cf2fb3235d3065bf613ff866f3c"
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{
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"url": "https://git.kernel.org/stable/c/4bec4a498ce86314d470ae6144120461f2138c29"
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{
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"url": "https://git.kernel.org/stable/c/12624c5b724a81e14e532972b40d863b0de3b7d1"
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},
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{
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"url": "https://git.kernel.org/stable/c/2a368ccddfc492a0aa951e2caef2985f20e96503"
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},
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{
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"url": "https://git.kernel.org/stable/c/bb81702370fad22c06ca12b6e1648754dbc37e0f"
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}
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],
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"title": "ext4: handle wraparound when searching for blocks for indirect mapped blocks",
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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-2026-43067",
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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": "yes"
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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": "2026-10-16T15:14:16.994971Z"
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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-822",
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"description": "CWE-822 Untrusted Pointer Dereference"
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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": "2026-10-19T19:06:12.380Z"
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}
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}
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]
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}
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} |