# CVE-2022-26357: xen: race in VT-d domain ID cleanup Xen domain IDs are up to 15 bits wide

CVE-2022-26357 is fixed in xen on 1 platform, first by DEBIAN-CVE-2022-26357, released April 5, 2022. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2022-26357
- Priority: High
- CVSS: 7.0 (high)
- EPSS: 0.0026
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 5, 2022

## Description

race in VT-d domain ID cleanup Xen domain IDs are up to 15 bits wide. VT-d hardware may allow for only less than 15 bits to hold a domain ID associating a physical device with a particular domain. Therefore internally Xen domain IDs are mapped to the smaller value range. The cleaning up of the housekeeping structures has a race, allowing for VT-d domain IDs to be leaked and flushes to be bypassed.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | xen Debian 12.15 (bookworm) | 4.16.1-1 | [DEBIAN-CVE-2022-26357](https://patchblox.com/security/data/fix/linux/debian-cve-2022-26357.md) | Apr 5, 2022 |
| Linux | xen Debian 13.5 (trixie) | 4.16.1-1 | [DEBIAN-CVE-2022-26357](https://patchblox.com/security/data/fix/linux/debian-cve-2022-26357.md) | Apr 5, 2022 |
| Linux | xen Debian 14 | 4.16.1-1 | [DEBIAN-CVE-2022-26357](https://patchblox.com/security/data/fix/linux/debian-cve-2022-26357.md) | Apr 5, 2022 |

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