CVE-2023-34326 - CVE House
Back to Database
Status published Unknown CVE-2023-34326

x86/AMD: missing IOMMU TLB flushing

Vulnerability 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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

THREAT MONITOR

Am I Vulnerable?

Launch our assessment wizard to check if your infrastructure is exposed to • CVE-2023-34326

Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

  • This issue was discovered by Roger Pau Monné of XenServer.

References

More from Xen

View All →
CVE-2025-58151
varstored: TOCTOU issues with mapped guest memory
Critical 9.4
CVE-2025-58150
x86: buffer overrun with shadow paging + tracing
Unknown 0
CVE-2025-58149
Incorrect removal of permissions on PCI device unplug
Unknown 0
CVE-2025-58148
x86: Incorrect input sanitisation in Viridian hypercalls
Unknown 0
CVE-2025-58147
x86: Incorrect input sanitisation in Viridian hypercalls
Unknown 0

Affected Vendor

Affected Software

Xen
Vulnerable Versions:
consult Xen advisory XSA-442

Timeline

Official Publish: January 5th, 2024
Last Modified: November 4th, 2025
Added to House: July 22nd, 2026

CVSS Vectors

No vector data available

Weaknesses (CWE)

No CWE data available

MITRE ATT&CK TTPs

No associated TTPs found for this vulnerability.