Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

Go to Calendar     Go to Press Room     Go to Newsletters subscription

CVE-2026-79603

Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
08/09/2026
Last modified:
08/09/2026

Description

x86 PV guests can free memory pages while still keeping a stale TLB entry<br /> pointing to them. A TLB flush is only issued by Xen (if needed) when the<br /> page is re-used. Since it&amp;#39;s possible for the page to be scrubbed ahead of<br /> the TLB flush, there&amp;#39;s a window where a PV guest can modify an already<br /> scrubbed page.

Impact

Vector 3.x
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N CVSS v3.1 Severity and Metrics:

Base Score: 4.30 MEDIUM
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): Low
Integrity (I): None
Availability (A): None

Base Score 3.x
4.30
Severity 3.x
MEDIUM

References to Advisories, Solutions, and Tools