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CVE-2023-46839— pci: phantom functions assigned to incorrect contexts

Quick assessment

Affected
Xen Xen
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Xen是英国剑桥（Cambridge）大学的一款开源的虚拟机监视器产品。该产品能够使不同和不兼容的操作系统运行在同一台计算机上，并支持在运行时进行迁移，保证正常运行并且避免宕机。 Xen 4.17.x、4.15.x版本存在安全漏洞，该漏洞源于在某些情况下，允许攻击者通过 PCI设备访问内存。

AI Predicted 5.0 Difficulty: Moderate EPSS 0.80% · P55

Possible ATT&CK Techniques 1 AI

T1565.001 · Stored Data Manipulation
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I. Basic Information for CVE-2023-46839

Vulnerability Information
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Vulnerability Title
pci: phantom functions assigned to incorrect contexts
Source: CVE Program / CVE List V5
Vulnerability Description
PCI devices can make use of a functionality called phantom functions, that when enabled allows the device to generate requests using the IDs of functions that are otherwise unpopulated. This allows a device to extend the number of outstanding requests. Such phantom functions need an IOMMU context setup, but failure to setup the context is not fatal when the device is assigned. Not failing device assignment when such failure happens can lead to the primary device being assigned to a guest, while some of the phantom functions are assigned to a different domain.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Xen 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Xen是英国剑桥（Cambridge）大学的一款开源的虚拟机监视器产品。该产品能够使不同和不兼容的操作系统运行在同一台计算机上，并支持在运行时进行迁移，保证正常运行并且避免宕机。 Xen 4.17.x、4.15.x版本存在安全漏洞，该漏洞源于在某些情况下，允许攻击者通过 PCI设备访问内存。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Xen Xen consult Xen advisory XSA-449 -

II. Public POCs for CVE-2023-46839

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III. Intelligence Information for CVE-2023-46839

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Other References for CVE-2023-46839 (1)

Same Patch Batch · Xen · 2024-03-20 · 3 CVEs total

CVE-2023-46840 VT-d: Failure to quarantine devices in !HVM builds
CVE-2023-46841 x86: shadow stack vs exceptions from emulation stubs

IV. Related Vulnerabilities

Same product: Xen
Same vendor: Xen

V. Comments for CVE-2023-46839

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