CVE-2026-42488
Shadow paging error can mismatch page-tables and mapcache, risking corruption.
Is CVE-2026-42488 being exploited?
Not confirmed. CVE-2026-42488 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.35% probability of exploitation in the next 30 days.
How severe is CVE-2026-42488?
CVE-2026-42488 is rated High with a CVSS score of 8.1. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-42488?
Yes. A fix has been recorded for CVE-2026-42488. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What should I do about CVE-2026-42488?
Monitor health; patch when available; validate mapcache integrity.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Page-table mismatch can corrupt mapcache, risking VM instability and potential denial of service.
Patch when possible
- affectedconsult Xen advisory XSA-494
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.