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        "ecosystem": "Linux",
        "name": "Kernel"
      },
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  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43067.json"
  },
  "details": "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-\u003eac_g_ex.fe_group is \u003e= ngroups (for instance, if the goal\n   group was populated via stream allocation from s_mb_last_groups),\n   then start will be \u003e= 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().",
  "id": "CVE-2026-43067",
  "modified": "2026-08-12T03:51:47.225717828Z",
  "published": "2026-05-05T15:23:26.717Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/12624c5b724a81e14e532972b40d863b0de3b7d1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2a368ccddfc492a0aa951e2caef2985f20e96503"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4bec4a498ce86314d470ae6144120461f2138c29"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/83170a05908b6cf2fb3235d3065bf613ff866f3c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bb81702370fad22c06ca12b6e1648754dbc37e0f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f89bba144938921a2249237ad04a0183ff3f8930"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43067.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43067"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "ext4: handle wraparound when searching for blocks for indirect mapped blocks"
}