Xen x86 IOMMU Identity Mapping memory corruption

Summaryinfo

A vulnerability labeled as critical has been found in Xen. Affected by this vulnerability is an unknown functionality of the component x86 IOMMU Identity Mapping. Executing a manipulation can lead to memory corruption. This vulnerability appears as CVE-2024-31145. There is no available exploit. Applying a patch is advised to resolve this issue.

Detailsinfo

A vulnerability has been found in Xen (the affected version unknown) and classified as critical. This vulnerability affects an unknown part of the component x86 IOMMU Identity Mapping. The manipulation with an unknown input leads to a memory corruption vulnerability. The CWE definition for the vulnerability is CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Certain PCI devices in a system might be assigned Reserved Memory Regions (specified via Reserved Memory Region Reporting, "RMRR") for Intel VT-d or Unity Mapping ranges for AMD-Vi. These are typically used for platform tasks such as legacy USB emulation. Since the precise purpose of these regions is unknown, once a device associated with such a region is active, the mappings of these regions need to remain continuouly accessible by the device. In the logic establishing these mappings, error handling was flawed, resulting in such mappings to potentially remain in place when they should have been removed again. Respective guests would then gain access to memory regions which they aren't supposed to have access to.

The advisory is shared for download at xenbits.xen.org. This vulnerability was named CVE-2024-31145 since 03/28/2024. The exploitation appears to be easy. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 01/05/2026).

The vulnerability scanner Nessus provides a plugin with the ID 207717 (SUSE SLES15 Security Update : xen (SUSE-SU-2024:3423-1)), which helps to determine the existence of the flaw in a target environment.

Applying a patch is able to eliminate this problem.

The vulnerability is also documented in the vulnerability database at Tenable (207717). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

• Virtualization Software

Name

• Xen

License

• open-source

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VulDB is the best source for vulnerability data and more expert information about this specific topic.

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