{
  "cveId": "CVE-2026-23067",
  "url": "https://patchblox.com/security/cve/CVE-2026-23067",
  "summary": "CVE-2026-23067 is fixed in linux on 1 platform by DEBIAN-CVE-2026-23067 (version 6.18.8-1), released February 4, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  iommu/io-pgtable-arm: fix size_t signedness bug...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  iommu/io-pgtable-arm: fix size_t signedness bug in unmap path  __arm_lpae_unmap() returns size_t but was returning -ENOENT (negative error code) when encountering an unmapped PTE. Since size_t is unsigned, -ENOENT (typically -2) becomes a huge positive value (0xFFFFFFFFFFFFFFFE on 64-bit systems).  This corrupted value propagates through the call chain:   __arm_lpae_unmap() returns -ENOENT as size_t   -\u003E arm_lpae_unmap_pages() returns it   -\u003E __iommu_unmap() adds it to iova address   -\u003E iommu_pgsize() triggers BUG_ON due to corrupted iova  This can cause IOVA address overflow in __iommu_unmap() loop and trigger BUG_ON in iommu_pgsize() from invalid address alignment.  Fix by returning 0 instead of -ENOENT. The WARN_ON already signals the error condition, and returning 0 (meaning \u0022nothing unmapped\u0022) is the correct semantic for size_t return type. This matches the behavior of other io-pgtable implementations (io-pgtable-arm-v7s, io-pgtable-dart) which return 0 on error conditions.",
  "published": "2026-02-04T17:16:17Z",
  "severity": "medium",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00129,
  "epssPercentile": 0.02535,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "6.18.8-1",
      "fix": "DEBIAN-CVE-2026-23067",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-23067",
      "released": "2026-02-04T17:16:17Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T19:12:23Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}