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A race condition in Xen grant-table version switching affects the transition from grant table version 2 back to version 1. The flaw arises because code handling grant tables may drop and later re-acquire the grant table lock while incorrectly assuming that grant-table properties remain unchanged during the unlocked interval. In the v2-to-v1 case, this assumption is invalid because the separate status frames used by grant table v2 disappear when switching back to v1. As a result, concurrent operations can observe or act on stale assumptions about grant-table layout and state, leading to incorrect grant-table handling and potential security boundary violations in the hypervisor.
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No public exploit code observed for this vulnerability.
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Cross-references every affected SKU, including bundled OEM variants.
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