CVE-2026-23558 — grant table v2 race in status page mapping
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…
Published: 2026-05-19 · CVSS: 7.8 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7