{
  "cveId": "CVE-2026-43348",
  "url": "https://patchblox.com/security/cve/CVE-2026-43348",
  "summary": "CVE-2026-43348 is fixed in linux on 1 platform by DEBIAN-CVE-2026-43348 (version 7.0.3-1), released May 15, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  mshv_vtl: Fix vmemmap_shift exceeding MAX_FOLIO_...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  mshv_vtl: Fix vmemmap_shift exceeding MAX_FOLIO_ORDER  When registering VTL0 memory via MSHV_ADD_VTL0_MEMORY, the kernel computes pgmap-\u003Evmemmap_shift as the number of trailing zeros in the OR of start_pfn and last_pfn, intending to use the largest compound page order both endpoints are aligned to.  However, this value is not clamped to MAX_FOLIO_ORDER, so a sufficiently aligned range (e.g. physical range [0x800000000000, 0x800080000000), corresponding to start_pfn=0x800000000 with 35 trailing zeros) can produce a shift larger than what memremap_pages() accepts, triggering a WARN and returning -EINVAL:    WARNING: ... memremap_pages\u002B0x512/0x650   requested folio size unsupported  The MAX_FOLIO_ORDER check was added by commit 646b67d57589 (\u0022mm/memremap: reject unreasonable folio/compound page sizes in memremap_pages()\u0022).  Fix this by clamping vmemmap_shift to MAX_FOLIO_ORDER so we always request the largest order the kernel supports, in those cases, rather than an out-of-range value.  Also fix the error path to propagate the actual error code from devm_memremap_pages() instead of hard-coding -EFAULT, which was masking the real -EINVAL return.",
  "published": "2026-05-08T14:16:44Z",
  "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": 0.001,
  "epssPercentile": 0.00852,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.0.3-1",
      "fix": "DEBIAN-CVE-2026-43348",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-43348",
      "released": "2026-05-15T16:01:09Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T00:53:09Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}