CVE-2026-42488

x86: mismatched mapcache metadata

High · published June 18, 2026

CVSS v3.1
8.1
EPSS
0%
Percentile
27.8
In the wild
Unconfirmed
What it is

Some shadow paging errors paths will switch the page-tables without

updating the currently running vCPU reference. This causes a mismatch

between the loaded page-tables and the mapcache metadata which can lead

to corruption of the mapcache.

The record
Technical detail
CVSS v3.1
8.1 · HIGH
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00353 · 27.8th percentile
Published
2026-06-18T13:47Z
EPSS history
Timeline
  • 18 JUN 13:47Z
    x86: mismatched mapcache metadata
    cvelistv5