{
  "cveId": "CVE-2026-64318",
  "url": "https://patchblox.com/security/cve/CVE-2026-64318",
  "summary": "CVE-2026-64318 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-64318, released July 26, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "partitions: aix: bound the pp_count scan to the ppe array",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  partitions: aix: bound the pp_count scan to the ppe array  aix_partition() reads the physical volume descriptor into a fixed-size struct pvd and then scans its physical-partition-extent array:  \tint numpps = be16_to_cpu(pvd-\u003Epp_count); \t... \tfor (i = 0; i \u003C numpps; i \u002B= 1) { \t\tstruct ppe *p = pvd-\u003Eppe \u002B i; \t\t... \t\tlp_ix = be16_to_cpu(p-\u003Elp_ix);  pvd points at a single kmalloc()\u0027d struct pvd whose ppe[] member holds a fixed ARRAY_SIZE(pvd-\u003Eppe) (1016) entries, but the loop runs up to the on-disk pp_count.  pp_count is an unvalidated __be16 read straight from the descriptor, so a crafted AIX image with pp_count larger than 1016 drives the loop to read pvd-\u003Eppe[i] past the end of the allocation (up to 65535 entries, ~2 MB out of bounds).  The partition scan runs without mounting anything, when a block device with a crafted AIX/IBM partition table appears (an attacker-supplied image attached with losetup -P, or a device auto-scanned by udev), via msdos_partition() -\u003E aix_partition().  Clamp the scan to the number of entries the ppe[] array can hold.",
  "published": "2026-07-25T10:17:13Z",
  "severity": "Moderate",
  "cvss": 7.1,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
  "epss": 0.00164,
  "epssPercentile": 0.05649,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-64318",
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "6.1.180-1",
      "fix": "DEBIAN-CVE-2026-64318",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-64318",
      "released": "2026-07-26T13:52:50Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.96-1",
      "fix": "DEBIAN-CVE-2026-64318",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-64318",
      "released": "2026-07-26T13:52:50Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.1.4-1",
      "fix": "DEBIAN-CVE-2026-64318",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-64318",
      "released": "2026-07-26T13:52:50Z"
    },
    {
      "platform": "linux",
      "product": "linux-6.12",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "6.12.100-1~deb12u1",
      "fix": "DEBIAN-CVE-2026-64318",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-64318",
      "released": "2026-07-26T13:52:50Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T07:25:28Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}