# CVE-2023-34327: xen: [This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to...

CVE-2023-34327 is fixed in xen on 1 platform, first by DEBIAN-CVE-2023-34327, released January 5, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2023-34327
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0025
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jan 5, 2024

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | xen Debian 12.15 (bookworm) | 4.17.2+76-ge1f9cb16e2-1~deb12u1 | [DEBIAN-CVE-2023-34327](https://patchblox.com/security/data/fix/linux/debian-cve-2023-34327.md) | Jan 5, 2024 |
| Linux | xen Debian 13.5 (trixie) | 4.17.2+55-g0b56bed864-1 | [DEBIAN-CVE-2023-34327](https://patchblox.com/security/data/fix/linux/debian-cve-2023-34327.md) | Jan 5, 2024 |
| Linux | xen Debian 14 | 4.17.2+55-g0b56bed864-1 | [DEBIAN-CVE-2023-34327](https://patchblox.com/security/data/fix/linux/debian-cve-2023-34327.md) | Jan 5, 2024 |

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