CVE-2022-26364: vulnerability in xen
Published · Updated
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No sign of exploitation. No public exploitation artifact known so far.
Xen hypervisor doesn't properly account for CPU cache inconsistencies when checking if memory pages are safe. This allows attackers to bypass safety checks that prevent direct access to critical system structures, potentially enabling privilege escalation in virtualized environments.
A type reference counting mechanism in Xen's PV (paravirtual) x86 implementation fails to consider CPU-induced cache non-coherency when validating page contents. An attacker with guest-level access can exploit timing windows where cached data differs from main memory to bypass Xen's safety invariants, gaining unauthorized write access to pagetables or other protected kernel structures.
In the same product, most dangerous first.