CVE-2026-79603
MEDIUM
NVD
CVSS Score
4.3
Severity
MEDIUM
Published
Sep 08, 2026
Vendor
unknown
Description
x86 PV guests can free memory pages while still keeping a stale TLB entry pointing to them. A TLB flush is only issued by Xen (if needed) when the page is re-used. Since it's possible for the page to be scrubbed ahead of the TLB flush, there's a window where a PV guest can modify an already scrubbed page.