CVE-2026-79603
Unconditionally do TLB flushing ahead of page scrubbing
- State
- Published
- Severity
- 4.3 Medium
- Published
- Sep 8, 2026
- Updated
- Sep 8, 2026
- Reserved
- Aug 25, 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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 4.3 Medium | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N | CISA-ADP |
Weaknesses
- CWE-664 Improper Control of a Resource Through its Lifetime
Affected Products
| Product | Versions |
|---|---|
XenXen |
|
References
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