CVE-2023-34327

Description

[This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.]

AMD CPUs since ~2014 have extensions to normal x86 debugging functionality. Xen supports guests using these extensions.

Unfortunately there are errors in Xen's handling of the guest state, leading to denials of service.

CVE-2023-34327 - An HVM vCPU can end up operating in the context of a previous vCPUs debug mask state.
CVE-2023-34328 - A PV vCPU can place a breakpoint over the live GDT. This allows the PV vCPU to exploit XSA-156 / CVE-2015-8104 and lock up the CPU entirely.

CVSS Version 3.1

nvd
CVE ID: CVE-2023-34327
Base Score: 5.5
Base Severity: MEDIUM
Vector String:CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Impact Score: 3.6
Exploitability Score: 1.8

Refrence: NVD

Description​

Description