CVE-2026-23558

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.

CVSS Vector

Affected Products

References

• https://xenbits.xenproject.org/xsa/advisory-486.html
• http://www.openwall.com/lists/oss-security/2026/04/28/13
• http://xenbits.xen.org/xsa/advisory-486.html