VULNERABILITY INTELLIGENCE

CVE-2026-23558

CVSS score7.8 HIGH

EPSS probability0.12%

CISA KEVNot currently listed

Published2026-05-19

Last modified2026-10-14

CVSS vectorCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

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's secondary (P2M) page tables.

Weakness classification

134c704f-9b21-4f2e-91b3-4a467353bcc0: CWE-362

Primary references

security@xen.org — Mitigation, Patch, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108 — Mailing List, Mitigation, Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 — Mitigation, Patch, Vendor Advisory