# CVE-2022-33747: xen: Arm: unbounded memory consumption for 2nd-level page tables Certain actions require e.g

CVE-2022-33747 is fixed in xen on 1 platform, first by DEBIAN-CVE-2022-33747, released October 11, 2022. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2022-33747
- Priority: Routine
- CVSS: 3.8 (low)
- EPSS: 0.0029
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 11, 2022

## Description

Arm: unbounded memory consumption for 2nd-level page tables Certain actions require e.g. removing pages from a guest's P2M (Physical-to-Machine) mapping. When large pages are in use to map guest pages in the 2nd-stage page tables, such a removal operation may incur a memory allocation (to replace a large mapping with individual smaller ones). These memory allocations are taken from the global memory pool. A malicious guest might be able to cause the global memory pool to be exhausted by manipulating its own P2M mappings.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | xen Debian 12.15 (bookworm) | 4.16.2+90-g0d39a6d1ae-1 | [DEBIAN-CVE-2022-33747](https://patchblox.com/security/data/fix/linux/debian-cve-2022-33747.md) | Oct 11, 2022 |
| Linux | xen Debian 13.5 (trixie) | 4.16.2+90-g0d39a6d1ae-1 | [DEBIAN-CVE-2022-33747](https://patchblox.com/security/data/fix/linux/debian-cve-2022-33747.md) | Oct 11, 2022 |
| Linux | xen Debian 14 | 4.16.2+90-g0d39a6d1ae-1 | [DEBIAN-CVE-2022-33747](https://patchblox.com/security/data/fix/linux/debian-cve-2022-33747.md) | Oct 11, 2022 |

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