CVE-2026-79603

MediumCVSS 4.3/10Last modified Sep 8, 2026

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.

Metrics

CVSS 3.1 4.3/10CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Weakness enumeration

CWE-664

Affected software

Source: the vendor's advisory (CNA). NVD analysis pending.

Vendor	Product	Versions
Xen	Xen	—

References

Timeline

Published: Sep 8, 2026
Last modified: Sep 8, 2026
NVD status: Awaiting Analysis

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