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CVE-2026-79609

8.8 high SSVC exploitation: none Published
NVD · CVE.org

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.

Fix

Nothing published yet: no patch, vendor advisory or mitigation reference on NVD, no vendor advisory in the News for this CVE, not in CISA's KEV, no fixed package version. BaselineWatch does not guess at one.

Change history 4

  1. StatusAwaiting Analysis → PublishedNVD modified 2026-10-20 17:34
  2. CwesCWE-284NVD modified 2026-10-20 18:17
  3. CVSS8.8 (v3.1, CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H)NVD modified 2026-10-20 18:17
  4. First seenunscoredNVD modified 2026-10-14 16:10

Affected (CPE criteria) 0

NVD has not attached CPE configurations yet.

References 2