CVE-2023-34328: x86/AMD: Debug Mask handling

First published: Tue Oct 10 2023(Updated: )

[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. 1) CVE-2023-34327 - An HVM vCPU can end up operating in the context of a previous vCPUs debug mask state. 2) 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.

Credit: security@xen.org

Never miss a vulnerability like this again

Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.

Read MoreStart Free Trial

• collector/oss-sec
• alias/CVE-2023-34327
• alias/CVE-2023-34328
• agent/type
• agent/first-publish-date
• collector/mitre-cve
• source/MITRE
• agent/last-modified-date
• agent/event
• collector/nvd-api
• source/NVD
• agent/software-canonical-lookup
• agent/remedy
• agent/severity
• agent/title
• agent/author
• agent/references
• agent/softwarecombine
• agent/tags
• agent/description
• agent/trending
• vendor/xen
• canonical/xen xen
• version/xen xen/4.5.0