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CVE-2023-46840— VT-d: Failure to quarantine devices in !HVM builds

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及之前版本存在安全漏洞，该漏洞源于源代码中的预处理器指令不正确，当设备从域中删除时，没有被正确隔离，且保留对之前所在域的访问权限。

AI Predicted 5.3 Difficulty: Theoretical EPSS 0.26% · P19

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2023-46840

Vulnerability Information
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Vulnerability Title
VT-d: Failure to quarantine devices in !HVM builds
Source: CVE Program / CVE List V5
Vulnerability Description
Incorrect placement of a preprocessor directive in source code results in logic that doesn't operate as intended when support for HVM guests is compiled out of Xen.
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及之前版本存在安全漏洞，该漏洞源于源代码中的预处理器指令不正确，当设备从域中删除时，没有被正确隔离，且保留对之前所在域的访问权限。
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-450 -

II. Public POCs for CVE-2023-46840

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III. Intelligence Information for CVE-2023-46840

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Other References for CVE-2023-46840 (1)

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

CVE-2023-46839 pci: phantom functions assigned to incorrect contexts
CVE-2023-46841 x86: shadow stack vs exceptions from emulation stubs

IV. Related Vulnerabilities

Same product: Xen
Same vendor: Xen

V. Comments for CVE-2023-46840

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