CVE-2026-79603 — Unconditionally do TLB flushing ahead of page scrubbing
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 …
Published: 2026-09-08 · CVSS: 4.3 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7