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CVE-2021-28702

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 4.12之前版本存在资源管理错误漏洞，该漏洞源于未正确取消分配RMRR的PCI设备系统中的某些PCI设备可能已分配保留内存区域（通过保留内存区域报告“RMRR”指定）。

AI Predicted 5.5 Difficulty: Hard EPSS 0.44% · P37
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I. Basic Information for CVE-2021-28702

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
PCI devices with RMRRs not deassigned correctly Certain PCI devices in a system might be assigned Reserved Memory Regions (specified via Reserved Memory Region Reporting, "RMRR"). These are typically used for platform tasks such as legacy USB emulation. If such a device is passed through to a guest, then on guest shutdown the device is not properly deassigned. The IOMMU configuration for these devices which are not properly deassigned ends up pointing to a freed data structure, including the IO Pagetables. Subsequent DMA or interrupts from the device will have unpredictable behaviour, ranging from IOMMU faults to memory corruption.
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 资源管理错误漏洞
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 4.12之前版本存在资源管理错误漏洞，该漏洞源于未正确取消分配RMRR的PCI设备系统中的某些PCI设备可能已分配保留内存区域（通过保留内存区域报告“RMRR”指定）。
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 unspecified ~ 4.12 -

II. Public POCs for CVE-2021-28702

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III. Intelligence Information for CVE-2021-28702

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Vendor Advisories for CVE-2021-28702 (2)

Mailing List Discussions for CVE-2021-28702 (4)

Other References for CVE-2021-28702 (1)

IV. Related Vulnerabilities

Same product: xen
Same vendor: Xen

V. Comments for CVE-2021-28702

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