# CVE-2023-46837: xen: Arm provides multiple helpers to clean & invalidate the cache for a given region

CVE-2023-46837 is fixed in xen on 1 platform, first by DEBIAN-CVE-2023-46837, released January 5, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2023-46837
- Priority: Routine
- CVSS: 3.3 (low)
- EPSS: 0.0024
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jan 5, 2024

## Description

Arm provides multiple helpers to clean & invalidate the cache for a given region.  This is, for instance, used when allocating guest memory to ensure any writes (such as the ones during scrubbing) have reached memory before handing over the page to a guest.  Unfortunately, the arithmetics in the helpers can overflow and would then result to skip the cache cleaning/invalidation.  Therefore there is no guarantee when all the writes will reach the memory.  This undefined behavior was meant to be addressed by XSA-437, but the approach was not sufficient.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | xen Debian 12.15 (bookworm) | 4.17.3+10-g091466ba55-1~deb12u1 | [DEBIAN-CVE-2023-46837](https://patchblox.com/security/data/fix/linux/debian-cve-2023-46837.md) | Jan 5, 2024 |
| Linux | xen Debian 13.5 (trixie) | 4.17.3+10-g091466ba55-1 | [DEBIAN-CVE-2023-46837](https://patchblox.com/security/data/fix/linux/debian-cve-2023-46837.md) | Jan 5, 2024 |
| Linux | xen Debian 14 | 4.17.3+10-g091466ba55-1 | [DEBIAN-CVE-2023-46837](https://patchblox.com/security/data/fix/linux/debian-cve-2023-46837.md) | Jan 5, 2024 |

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