CyberRota Analysis
This is a high severity vulnerability with a CVSS score of 7.8. See the original NVD description below for full technical details.
CVE
CVE-2026-23558
Severity
HIGH
CVSS
7.8
EPSS
0.12%
Original NVD 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.
Related CVEs
Other vulnerabilities affecting the same vendor(s)