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A race condition in Xen grant-table version switching affects the transition from grant table version 1 to version 2. The flaw arises because code paths handling grant tables may drop the grant table lock and later re-acquire it while incorrectly assuming that grant-table properties remain unchanged during the unlocked interval. During a v1 to v2 transition, the number of valid grant references decreases because version 2 uses a larger shared entry structure while the shared table size remains fixed. If code resumes operation based on stale assumptions after the lock is re-acquired, Xen can process inconsistent grant-table state. This vulnerability affects Xen versions from 4.0 onward in configurations where grant table support is present and grant table version 2 interfaces are available to guests.
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No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.