CVE-2026-23558 — grant table v2 race in status page mapping

Description (CNA)

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.

Affected (CNA)

Vendor / product	Versions
Xen / Xen	unknown consult Xen advisory XSA-486

CWE

No CWE identifiers supplied.

References

https://xenbits.xenproject.org/xsa/advisory-486.html

ADP enrichment

CVE

No English description supplied.

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

CISA-ADP

No English description supplied.

No references supplied.