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.
Analysis and contextual insights are available on OpenCVE Cloud.
Vendor Workaround
There is no known mitigation.
Tracking
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No advisories yet.
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
|
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 |
|
Status: PUBLISHED
Assigner: XEN
Published:
Updated: 2026-09-08T17:08:33.807Z
Reserved: 2026-08-25T07:35:05.289Z
Link: CVE-2026-79603
Updated: 2026-09-08T13:08:04.972Z
Status : Awaiting Analysis
Published: 2026-09-08T13:17:27.253
Modified: 2026-09-08T19:20:25.117
Link: CVE-2026-79603
No data.
OpenCVE Enrichment
Updated: 2026-09-08T18:15:15Z
-
CWE-664
Improper Control of a Resource Through its Lifetime