Stale DMA Mappings in AMD-IOMMU (v4.x) allow Guest Privilege Escalation
CVE-2023-34326 Published on January 5, 2024

x86/AMD: missing IOMMU TLB flushing
The caching invalidation guidelines from the AMD-Vi specification (48882Rev 3.07-PUBOct 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.

NVD

Vulnerability Analysis

CVE-2023-34326 is exploitable with local system access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to be very high.

Attack Vector:
LOCAL
Attack Complexity:
LOW
Privileges Required:
LOW
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
HIGH
Integrity Impact:
HIGH
Availability Impact:
HIGH

Weakness Type

Operation on a Resource after Expiration or Release

The software uses, accesses, or otherwise operates on a resource after that resource has been expired, released, or revoked.


Products Associated with CVE-2023-34326

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Citrix Xen Xen
 

Affected Versions

Xen Version consult Xen advisory XSA-442 is unknown by CVE-2023-34326

Exploit Probability

EPSS
0.10%
Percentile
28.34%

EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.