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A race condition in the Xen hypervisor grant table v2 status page mapping logic can occur when an x86 HVM or PVH guest switches its grant table version from v2 to v1 while concurrently mapping status pages through XENMEM_add_to_physmap. Due to incomplete prior fixes associated with earlier Xen Security Advisories, some grant status pages may be freed while mappings to those pages are still inserted into the guest's secondary P2M page tables, creating a use-after-free condition. The issue affects Xen 4.0 and later and is tracked as XSA-486. Xen 3.4 and earlier are not affected. x86 PV guests cannot leverage the flaw, and Arm systems are not affected because grant table v2 is unsupported there.
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No public exploit code observed for this vulnerability.
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9 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A high-severity race condition/use-after-free in Xen grant table handling that can allow privileged guest code in HVM or PVH guests to escape to the hypervisor.
A Citrix-addressed vulnerability listed in the July 1, 2026 security updates affecting Citrix products; specific technical details are not provided in the content.
A race condition and use-after-free flaw in grant table v2 status page mapping that could let a privileged HVM or PVH guest-domain user escalate privileges to the hypervisor.
A race condition in Xen grant table v2 status page mapping that could allow a privileged guest VM user to compromise the host in certain conditions.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.