CVE-2026-42493

Published: Jul 28, 2026Modified: Jul 28, 2026Deferred

7.5

Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploitability: 3.9 / Impact: 3.6

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary)

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.

Related CWEs

CWE-400

Uncontrolled Resource Consumption

The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources.

References (3)

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

Source: security@xen.org

http://www.openwall.com/lists/oss-security/2026/07/28/12

Source: af854a3a-2127-422b-91ae-364da2661108

http://xenbits.xen.org/xsa/advisory-495.html

Source: af854a3a-2127-422b-91ae-364da2661108

Timeline

No history available yet.