CVE-2026-42493

Description

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.

CVSS Vector

References

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