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.
Published: 2026-09-08
Score: 4.3 Medium
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
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Remediation

Vendor Workaround

There is no known mitigation.

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History

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

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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 : Received

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

Modified: 2026-09-08T14:17:28.890

Link: CVE-2026-79603

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-08T14:00:19Z

Weaknesses