{
  "cveId": "CVE-2026-23558",
  "url": "https://patchblox.com/security/cve/CVE-2026-23558",
  "summary": "CVE-2026-23558 is fixed in xen on 1 platform, first by DEBIAN-CVE-2026-23558, released May 19, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "xen: The adjustments made for XSA-379 as well as those subsequently becoming XSA-387 still left a race window, when a HVM...",
  "description": "The adjustments made for XSA-379 as well as those subsequently becoming XSA-387 still left a race window, when a HVM or PVH guest does a grant table version change from v2 to v1 in parallel with mapping the status page(s) via XENMEM_add_to_physmap.  Some of the status pages may then be freed while mappings of them would still be inserted into the guest\u0027s secondary (P2M) page tables.",
  "published": "2026-05-19T14:16:38Z",
  "severity": "high",
  "cvss": 7.8,
  "cvssVector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H",
  "epss": 0.00117,
  "epssPercentile": 0.01701,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "xen",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "4.17.7-0\u002Bdeb12u1",
      "fix": "DEBIAN-CVE-2026-23558",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-23558",
      "released": "2026-05-19T14:16:38Z"
    },
    {
      "platform": "linux",
      "product": "xen",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "4.20.3\u002B127-gc42374a105-0\u002Bdeb13u1",
      "fix": "DEBIAN-CVE-2026-23558",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-23558",
      "released": "2026-05-19T14:16:38Z"
    },
    {
      "platform": "linux",
      "product": "xen",
      "release": "Debian 14",
      "fixedVersion": "4.20.3\u002B127-gc42374a105-1",
      "fix": "DEBIAN-CVE-2026-23558",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-23558",
      "released": "2026-05-19T14:16:38Z"
    }
  ],
  "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"
  }
}