# CVE-2022-42327: xen: x86: unintended memory sharing between guests On Intel systems that support the "virtualize APIC accesses" feature, a...

CVE-2022-42327 is fixed in xen on 1 platform, first by DEBIAN-CVE-2022-42327, released November 1, 2022. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2022-42327
- Priority: High
- CVSS: 7.1 (high)
- EPSS: 0.0025
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Nov 1, 2022

## Description

x86: unintended memory sharing between guests On Intel systems that support the "virtualize APIC accesses" feature, a guest can read and write the global shared xAPIC page by moving the local APIC out of xAPIC mode. Access to this shared page bypasses the expected isolation that should exist between two guests.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | xen Debian 12.15 (bookworm) | 4.16.2+90-g0d39a6d1ae-1 | [DEBIAN-CVE-2022-42327](https://patchblox.com/security/data/fix/linux/debian-cve-2022-42327.md) | Nov 1, 2022 |
| Linux | xen Debian 13.5 (trixie) | 4.16.2+90-g0d39a6d1ae-1 | [DEBIAN-CVE-2022-42327](https://patchblox.com/security/data/fix/linux/debian-cve-2022-42327.md) | Nov 1, 2022 |
| Linux | xen Debian 14 | 4.16.2+90-g0d39a6d1ae-1 | [DEBIAN-CVE-2022-42327](https://patchblox.com/security/data/fix/linux/debian-cve-2022-42327.md) | Nov 1, 2022 |

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