# CVE-2023-34326: xen: The caching invalidation guidelines from the AMD-Vi specification (48882—Rev 3.07-PUB—Oct 2022) is incorrect on some...

CVE-2023-34326 is fixed in xen on 1 platform, first by DEBIAN-CVE-2023-34326, released January 5, 2024. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2023-34326
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0028
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jan 5, 2024

## Description

The caching invalidation guidelines from the AMD-Vi specification (48882—Rev 3.07-PUB—Oct 2022) is incorrect on some hardware, as devices will malfunction (see stale DMA mappings) if some fields of the DTE are updated but the IOMMU TLB is not flushed.  Such stale DMA mappings can point to memory ranges not owned by the guest, thus allowing access to unindented memory regions.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | xen Debian 12.15 (bookworm) | 4.17.2+76-ge1f9cb16e2-1~deb12u1 | [DEBIAN-CVE-2023-34326](https://patchblox.com/security/data/fix/linux/debian-cve-2023-34326.md) | Jan 5, 2024 |
| Linux | xen Debian 13.5 (trixie) | 4.17.2+55-g0b56bed864-1 | [DEBIAN-CVE-2023-34326](https://patchblox.com/security/data/fix/linux/debian-cve-2023-34326.md) | Jan 5, 2024 |
| Linux | xen Debian 14 | 4.17.2+55-g0b56bed864-1 | [DEBIAN-CVE-2023-34326](https://patchblox.com/security/data/fix/linux/debian-cve-2023-34326.md) | Jan 5, 2024 |

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