{
  "cveId": "CVE-2026-79609",
  "url": "https://patchblox.com/security/cve/CVE-2026-79609",
  "summary": "CVE-2026-79609 is fixed in xen on 1 platform, first by DEBIAN-CVE-2026-79609, released October 19, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "xen: XPTI (Xen Page Table Isolation) was introduced to mitigate Meltdown (CVE-2017-5754, one aspect of XSA-254)",
  "description": "XPTI (Xen Page Table Isolation) was introduced to mitigate Meltdown (CVE-2017-5754, one aspect of XSA-254).  This involves copying 64-bit PV guest page table entries from guest-chosen root page tables to the Xen- chosen one which is in actual use by hardware.  To read the guest root page table, the directmap is used.  PV guests, however, have a directmap which may not cover all memory; in particular this is the case if any memory extends beyond the 5 TiB (CONFIG_BIGMEM=y: 3.5 TiB) address boundary.",
  "published": "2026-10-13T16:17:23Z",
  "severity": "high",
  "cvss": 8.8,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
  "epss": 0.00106,
  "epssPercentile": 0.01114,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "xen",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "4.17.7\u002B13-g2445b30a44-0\u002Bdeb12u1",
      "fix": "DEBIAN-CVE-2026-79609",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-79609",
      "released": "2026-10-19T16:27:52Z"
    },
    {
      "platform": "linux",
      "product": "xen",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "4.20.4\u002B39-gf1e1321c87-0\u002Bdeb13u1",
      "fix": "DEBIAN-CVE-2026-79609",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-79609",
      "released": "2026-10-19T16:27:52Z"
    },
    {
      "platform": "linux",
      "product": "xen",
      "release": "Debian 14",
      "fixedVersion": "4.20.4\u002B39-gf1e1321c87-1",
      "fix": "DEBIAN-CVE-2026-79609",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-79609",
      "released": "2026-10-19T16:27:52Z"
    },
    {
      "platform": "linux",
      "product": "xen",
      "release": "sles 15.7",
      "fixedVersion": "4.20.4_06-150700.3.49.2",
      "fix": "SUSE-SU-2026:4942-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-4942-1",
      "released": "2026-11-07T00:43:02Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}