{
  "cveId": "CVE-2026-43067",
  "url": "https://patchblox.com/security/cve/CVE-2026-43067",
  "summary": "CVE-2026-43067 is fixed in 41 products on 1 platform, first by ALAS2023-2026-1646, released May 11, 2026. It is not reported as exploited. Patch Radar priority: Urgent.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  ext4: handle wraparound when searching for block...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  ext4: handle wraparound when searching for blocks for indirect mapped blocks  Commit 4865c768b563 (\u0022ext4: always allocate blocks only from groups inode can use\u0022) restricts what blocks will be allocated for indirect block based files to block numbers that fit within 32-bit block numbers.  However, when using a review bot running on the latest Gemini LLM to check this commit when backporting into an LTS based kernel, it raised this concern:     If ac-\u003Eac_g_ex.fe_group is \u003E= ngroups (for instance, if the goal    group was populated via stream allocation from s_mb_last_groups),    then start will be \u003E= ngroups.     Does this allow allocating blocks beyond the 32-bit limit for    indirect block mapped files? The commit message mentions that    ext4_mb_scan_groups_linear() takes care to not select unsupported    groups. However, its loop uses group = *start, and the very first    iteration will call ext4_mb_scan_group() with this unsupported    group because next_linear_group() is only called at the end of the    iteration.  After reviewing the code paths involved and considering the LLM review, I determined that this can happen when there is a file system where some files/directories are extent-mapped and others are indirect-block mapped.  To address this, add a safety clamp in ext4_mb_scan_groups().",
  "published": "2026-05-05T16:16:15Z",
  "severity": "critical",
  "cvss": 9.8,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00504,
  "epssPercentile": 0.43356,
  "priority": "Urgent",
  "priorityTier": 2,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
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  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
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}