CVE-2026-79603
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.
- Score
- CVSS 3.1 4.3 Medium
- Status
- Awaiting Analysis - security@xen.org
- Published
- 2026-09-08
- Last modified
- 2026-09-08
- Weaknesses
- CWE-664
Affected products
References
- https://xenbits.xenproject.org/xsa/advisory-511.html
- http://www.openwall.com/lists/oss-security/2026/09/08/8
- http://xenbits.xen.org/xsa/advisory-511.html
