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.
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.


Workaround

There is no known mitigation.

History

Tue, 08 Sep 2026 18:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-635
References

Tue, 08 Sep 2026 18:00:00 +0000

Type Values Removed Values Added
First Time appeared Xen
Xen xen
Vendors & Products Xen
Xen xen

Tue, 08 Sep 2026 14:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-664
References
Metrics cvssV3_1

{'score': 4.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 08 Sep 2026 14:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-635

Tue, 08 Sep 2026 12:30:00 +0000

Type Values Removed Values Added
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.
Title Unconditionally do TLB flushing ahead of page scrubbing
References

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: XEN

Published:

Updated: 2026-09-08T17:08:33.807Z

Reserved: 2026-08-25T07:35:05.289Z

Link: CVE-2026-79603

cve-icon Vulnrichment

Updated: 2026-09-08T13:08:04.972Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-09-08T13:17:27.253

Modified: 2026-09-08T19:20:25.117

Link: CVE-2026-79603

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-08T18:15:15Z

Weaknesses