Xen Security Advisory 511 v3 (CVE-2026-79603) - Unconditionally do TLB flushing ahead of page scrubbing

As cited

Copy frozen at 2026-09-08 18:07 UTC (site build).

vulnerabilities

Xen Security Advisory 511 v3 (CVE-2026-79603) - Unconditionally do TLB flushing ahead of page scrubbing

Xen released Security Advisory 511 (CVE-2026-79603) to address a flaw where x86 paravirtual guests can free memory pages while maintaining stale Translation Lookaside Buffer (TLB) entries. The advisory requires Xen to unconditionally flush the TLB before page scrubbing to prevent potential exploitation.

Why it matters: Organizations running x86 paravirtual guests on Xen hypervisors should evaluate and apply this patch to prevent memory access vulnerabilities that could allow guest escape or information disclosure.

Source published

2026-09-08 15:39 UTC

First seen by Cybersecurity Tracker

2026-09-08 16:31 UTC