CVE-2026-79603

Published: Sep 8, 2026Modified: Sep 8, 2026

4.3

Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Exploitability: 2.8 / Impact: 1.4

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary)

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.

Related CWEs

CWE-664

Improper Control of a Resource Through its Lifetime

The product does not maintain or incorrectly maintains control over a resource throughout its lifetime of creation, use, and release.

References (3)

https://xenbits.xenproject.org/xsa/advisory-511.html

Source: security@xen.org

http://www.openwall.com/lists/oss-security/2026/09/08/8

Source: af854a3a-2127-422b-91ae-364da2661108

http://xenbits.xen.org/xsa/advisory-511.html

Source: af854a3a-2127-422b-91ae-364da2661108

Timeline

No history available yet.