CVE-2026-42493 — x86 shadow paging is deprecated

Description (CNA)

Addressing certain issues, in particular related to operations which may take excessively long and therefore would need preemption, has turned out overly costly. Since alternatives (HVM/PVH: HAP, PV: shim) are commonly available, the decision was to deprecate the functionality, while still retaining it for people to use at their own (security) risk. Memory-wise small enough guests may still be okay to run.

Affected (CNA)

Vendor / product	Versions
Xen / Xen	unknown consult Xen advisory XSA-495

CWE

No CWE identifiers supplied.

References

https://xenbits.xenproject.org/xsa/advisory-495.html

ADP enrichment

CVE

No English description supplied.

http://xenbits.xen.org/xsa/advisory-495.html
http://www.openwall.com/lists/oss-security/2026/07/28/12

CISA-ADP

No English description supplied.

No references supplied.