# CVE-2022-42335: xen: x86 shadow paging arbitrary pointer dereference In environments where host assisted address translation is necessary...

CVE-2022-42335 is fixed in xen on 1 platform, first by DEBIAN-CVE-2022-42335, released April 25, 2023. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2022-42335
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0026
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 25, 2023

## Description

x86 shadow paging arbitrary pointer dereference In environments where host assisted address translation is necessary but Hardware Assisted Paging (HAP) is unavailable, Xen will run guests in so called shadow mode. Due to too lax a check in one of the hypervisor routines used for shadow page handling it is possible for a guest with a PCI device passed through to cause the hypervisor to access an arbitrary pointer partially under guest control.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | xen Debian 12.15 (bookworm) | 4.17.1+2-gb773c48e36-1 | [DEBIAN-CVE-2022-42335](https://patchblox.com/security/data/fix/linux/debian-cve-2022-42335.md) | Apr 25, 2023 |
| Linux | xen Debian 13.5 (trixie) | 4.17.1+2-gb773c48e36-1 | [DEBIAN-CVE-2022-42335](https://patchblox.com/security/data/fix/linux/debian-cve-2022-42335.md) | Apr 25, 2023 |
| Linux | xen Debian 14 | 4.17.1+2-gb773c48e36-1 | [DEBIAN-CVE-2022-42335](https://patchblox.com/security/data/fix/linux/debian-cve-2022-42335.md) | Apr 25, 2023 |

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