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CVE-2026-79610 (XSA-501) is a vulnerability in Xen involving race conditions during transitions between grant table versions v1 and v2. Specifically, a v2 to v1 to v2 change sequence can cause status pages to be freed and then reallocated, resulting in stale pointers due to changed addresses in the status array. This can lead to serious impacts on confidentiality, integrity, and availability.

The vulnerability described in XSA-501 (CVE-2026-79610) concerns race conditions when switching between grant table versions v1 and v2 in Xen. During a v2 to v1 to v2 transition, status pages are freed and then reallocated, which can cause the addresses of these pages to change. This results in stale pointers into the status array, potentially causing memory corruption or other security issues. The CVSS 3.1 score is 8.8, indicating high severity with local attack vector, low complexity, low privileges required, no user interaction, scope changed, and high impact on confidentiality, integrity, and availability.

CVE-2026-79610 (XSA-501) is a vulnerability in Xen involving race conditions during transitions between grant table versions v1 and v2. Specifically, a v2 to v1 to v2 change sequence can cause status pages to be freed and then reallocated, resulting in stale pointers due to changed addresses in the 

Xen: XSA-501 was about issues with v1 -> v2 and v2 -> v1 changes racing certain other grant table operations. (CVE-2026-79610)

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