CVE-2023-46842 Affecting xen package, versions <4.18.2-r0
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Test your applications- Snyk ID SNYK-ALPINE320-XEN-7012590
- published 23 May 2024
- disclosed 16 May 2024
Introduced: 16 May 2024
CVE-2023-46842 Open this link in a new tabHow to fix?
Upgrade Alpine:3.20 xen to version 4.18.2-r0 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream xen package and not the xen package as distributed by Alpine.
See How to fix? for Alpine:3.20 relevant fixed versions and status.
Unlike 32-bit PV guests, HVM guests may switch freely between 64-bit and other modes. This in particular means that they may set registers used to pass 32-bit-mode hypercall arguments to values outside of the range 32-bit code would be able to set them to.
When processing of hypercalls takes a considerable amount of time, the hypervisor may choose to invoke a hypercall continuation. Doing so involves putting (perhaps updated) hypercall arguments in respective registers. For guests not running in 64-bit mode this further involves a certain amount of translation of the values.
Unfortunately internal sanity checking of these translated values assumes high halves of registers to always be clear when invoking a hypercall. When this is found not to be the case, it triggers a consistency check in the hypervisor and causes a crash.