CVE-2026-79603

MEDIUM 4.3

Unconditionally do TLB flushing ahead of page scrubbing

CVSS Score

4.3

EPSS Score

0.0%

EPSS Percentile

0th

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.

Vendor	xen
Product	xen
Published	Sep 8, 2026
Last Updated	Sep 8, 2026

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Affected Versions

Xen / Xen

All versions affected

References

NVD ↗ CVE.org ↗ EPSS Data ↗

xenbits.xenproject.org: https://xenbits.xenproject.org/xsa/advisory-511.html xenbits.xen.org: http://xenbits.xen.org/xsa/advisory-511.html openwall.com: http://www.openwall.com/lists/oss-security/2026/09/08/8

Credits

This issue was discovered by Roger Pau Monné of AMD.