{
  "cveId": "CVE-2026-79603",
  "url": "https://patchblox.com/security/cve/CVE-2026-79603",
  "summary": "CVE-2026-79603 is fixed in 15 products on 1 platform, first by SUSE-SU-2026:4090-1, released September 8, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "xen: x86 PV guests can free memory pages while still keeping a stale TLB entry pointing to them",
  "description": "x86 PV guests can free memory pages while still keeping a stale TLB entry pointing to them.  A TLB flush is only issued by Xen (if needed) when the page is re-used.  Since it\u0027s possible for the page to be scrubbed ahead of the TLB flush, there\u0027s a window where a PV guest can modify an already scrubbed page.",
  "published": "2026-09-08T12:26:56Z",
  "severity": "medium",
  "cvss": 4.3,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N",
  "epss": 0.00222,
  "epssPercentile": 0.12896,
  "priority": "Routine",
  "priorityTier": 4,
  "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-2026-79603",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-79603",
      "released": "2026-09-08T13:17:27Z"
    },
    {
      "platform": "linux",
      "product": "xen",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "4.20.4\u002B39-gf1e1321c87-0\u002Bdeb13u1",
      "fix": "DEBIAN-CVE-2026-79603",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-79603",
      "released": "2026-09-08T13:17:27Z"
    },
    {
      "platform": "linux",
      "product": "xen",
      "release": "Debian 14",
      "fixedVersion": "4.20.4\u002B39-gf1e1321c87-1",
      "fix": "DEBIAN-CVE-2026-79603",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-79603",
      "released": "2026-09-08T13:17:27Z"
    },
    {
      "platform": "linux",
      "product": "xen",
      "release": "Fedora 43",
      "fixedVersion": "4.20.4-2.fc43",
      "fix": "FEDORA-2026-A9EA805BC1",
      "url": "https://patchblox.com/security/fix/linux/fedora-2026-a9ea805bc1",
      "released": "2026-09-17T20:19:07Z"
    },
    {
      "platform": "linux",
      "product": "xen",
      "release": "sles 15.7",
      "fixedVersion": "4.20.4_04-150700.3.46.1",
      "fix": "SUSE-SU-2026:4090-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-4090-1",
      "released": "2026-09-08T12:26:56Z"
    },
    {
      "platform": "linux",
      "product": "xen-debuginfo",
      "release": "Fedora 43",
      "fixedVersion": "4.20.4-2.fc43",
      "fix": "FEDORA-2026-A9EA805BC1",
      "url": "https://patchblox.com/security/fix/linux/fedora-2026-a9ea805bc1",
      "released": "2026-09-17T20:19:07Z"
    },
    {
      "platform": "linux",
      "product": "xen-debugsource",
      "release": "Fedora 43",
      "fixedVersion": "4.20.4-2.fc43",
      "fix": "FEDORA-2026-A9EA805BC1",
      "url": "https://patchblox.com/security/fix/linux/fedora-2026-a9ea805bc1",
      "released": "2026-09-17T20:19:07Z"
    },
    {
      "platform": "linux",
      "product": "xen-devel",
      "release": "Fedora 43",
      "fixedVersion": "4.20.4-2.fc43",
      "fix": "FEDORA-2026-A9EA805BC1",
      "url": "https://patchblox.com/security/fix/linux/fedora-2026-a9ea805bc1",
      "released": "2026-09-17T20:19:07Z"
    },
    {
      "platform": "linux",
      "product": "xen-doc",
      "release": "Fedora 43",
      "fixedVersion": "4.20.4-2.fc43",
      "fix": "FEDORA-2026-A9EA805BC1",
      "url": "https://patchblox.com/security/fix/linux/fedora-2026-a9ea805bc1",
      "released": "2026-09-17T20:19:07Z"
    },
    {
      "platform": "linux",
      "product": "xen-hypervisor",
      "release": "Fedora 43",
      "fixedVersion": "4.20.4-2.fc43",
      "fix": "FEDORA-2026-A9EA805BC1",
      "url": "https://patchblox.com/security/fix/linux/fedora-2026-a9ea805bc1",
      "released": "2026-09-17T20:19:07Z"
    },
    {
      "platform": "linux",
      "product": "xen-libs",
      "release": "Fedora 43",
      "fixedVersion": "4.20.4-2.fc43",
      "fix": "FEDORA-2026-A9EA805BC1",
      "url": "https://patchblox.com/security/fix/linux/fedora-2026-a9ea805bc1",
      "released": "2026-09-17T20:19:07Z"
    },
    {
      "platform": "linux",
      "product": "xen-libs-debuginfo",
      "release": "Fedora 43",
      "fixedVersion": "4.20.4-2.fc43",
      "fix": "FEDORA-2026-A9EA805BC1",
      "url": "https://patchblox.com/security/fix/linux/fedora-2026-a9ea805bc1",
      "released": "2026-09-17T20:19:07Z"
    },
    {
      "platform": "linux",
      "product": "xen-licenses",
      "release": "Fedora 43",
      "fixedVersion": "4.20.4-2.fc43",
      "fix": "FEDORA-2026-A9EA805BC1",
      "url": "https://patchblox.com/security/fix/linux/fedora-2026-a9ea805bc1",
      "released": "2026-09-17T20:19:07Z"
    },
    {
      "platform": "linux",
      "product": "xen-ocaml",
      "release": "Fedora 43",
      "fixedVersion": "4.20.4-2.fc43",
      "fix": "FEDORA-2026-A9EA805BC1",
      "url": "https://patchblox.com/security/fix/linux/fedora-2026-a9ea805bc1",
      "released": "2026-09-17T20:19:07Z"
    },
    {
      "platform": "linux",
      "product": "xen-ocaml-debuginfo",
      "release": "Fedora 43",
      "fixedVersion": "4.20.4-2.fc43",
      "fix": "FEDORA-2026-A9EA805BC1",
      "url": "https://patchblox.com/security/fix/linux/fedora-2026-a9ea805bc1",
      "released": "2026-09-17T20:19:07Z"
    },
    {
      "platform": "linux",
      "product": "xen-ocaml-devel",
      "release": "Fedora 43",
      "fixedVersion": "4.20.4-2.fc43",
      "fix": "FEDORA-2026-A9EA805BC1",
      "url": "https://patchblox.com/security/fix/linux/fedora-2026-a9ea805bc1",
      "released": "2026-09-17T20:19:07Z"
    },
    {
      "platform": "linux",
      "product": "xen-ocaml-devel-debuginfo",
      "release": "Fedora 43",
      "fixedVersion": "4.20.4-2.fc43",
      "fix": "FEDORA-2026-A9EA805BC1",
      "url": "https://patchblox.com/security/fix/linux/fedora-2026-a9ea805bc1",
      "released": "2026-09-17T20:19:07Z"
    },
    {
      "platform": "linux",
      "product": "xen-runtime",
      "release": "Fedora 43",
      "fixedVersion": "4.20.4-2.fc43",
      "fix": "FEDORA-2026-A9EA805BC1",
      "url": "https://patchblox.com/security/fix/linux/fedora-2026-a9ea805bc1",
      "released": "2026-09-17T20:19:07Z"
    },
    {
      "platform": "linux",
      "product": "xen-runtime-debuginfo",
      "release": "Fedora 43",
      "fixedVersion": "4.20.4-2.fc43",
      "fix": "FEDORA-2026-A9EA805BC1",
      "url": "https://patchblox.com/security/fix/linux/fedora-2026-a9ea805bc1",
      "released": "2026-09-17T20:19:07Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T01:18:40Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}