🛡️ CVE-2023-34328 on Debian — xen

⚪ Unknown ✅ No Known Exploit OSV

N/A

CVSS Score

0 Low4 Medium7 High9 Critical10

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. 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.

Distribution advisory

This page covers CVE-2023-34328 as tracked by Debian, for the package xen. The fix is available in version 4.17.2+55-g0b56bed864-1; earlier versions remain affected.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

Affected software

DEBIAN-CVE-2023-34328 is recorded against 1 package.

xen (fixed in 4.17.2+55-g0b56bed864-1)

Timeline and source

Published on 5 January 2024 and last revised on 7 August 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

security-tracker.debian.org (Advisory)

CVE-2023-34328 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Alpine Base record Ubuntu

Details

Severity Unknown

CVSS Score N/A

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

CWE N/A

Public Exploit ✅ No

Source OSV

Published 2024-01-05

Updated 2026-08-12

Modified 2026-08-07

Fix URL N/A

Affected Packages

Software	From version	Fixed in
xen	—	4.17.2+55-g0b56bed864-1

References

ADVISORY https://security-tracker.debian.org/tracker/CVE-2023-34328

🔗 NVD 🔗 Mitre

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