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CVE-2026-79602— x86: improper handling of HVM emulation return codes

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Xen组织开源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存在安全漏洞，该漏洞源于客户机分配的PCI设备在IO端口空间至少有一个BAR时可触发Xen中的BUG()。

AI Predicted 7.0 Difficulty: Moderate EPSS 0.13% · P3

Affected Version Matrix 1

VendorProduct Version RangeStatus
Xen Xen consult Xen advisory XSA-510 unknown
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I. Basic Information for CVE-2026-79602

Vulnerability Information
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Vulnerability Title
x86: improper handling of HVM emulation return codes
Source: CVE Program / CVE List V5
Vulnerability Description
A guest with a PCI device assigned that has at least a BAR on the IO port space can trigger a BUG() in 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Xen组织开源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存在安全漏洞，该漏洞源于客户机分配的PCI设备在IO端口空间至少有一个BAR时可触发Xen中的BUG()。
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-510 -

II. Public POCs for CVE-2026-79602

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III. Intelligence Information for CVE-2026-79602

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Vendor Advisories for CVE-2026-79602 (1)

Same Patch Batch · Xen · 2026-09-08 · 3 CVEs total

CVE-2026-62437 x86: DMs may cause mem leak by IRQ binding
CVE-2026-79603 Unconditionally do TLB flushing ahead of page scrubbing

IV. Related Vulnerabilities

Same product: Xen
Same vendor: Xen

V. Comments for CVE-2026-79602

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