Xen Hypervisor Grant Table Race Condition Causing Stale Pointers (XSA-501)
CVE-2026-79610 Published on October 13, 2026

grant-table: double version change race
XSA-501 was about issues with v1 -> v2 and v2 -> v1 changes racing certain other grant table operations. Sadly a v2 -> v1 -> v2 change has yet another effect which wasn't accounted for: During the first change, status pages would be freed. During the second change they would be allocated again. Hence across the full pair of change the addresses of the status pages may change, rendering stale previously calculated pointers into the status array.