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CVE-2026-42487— x86 HVM I/O port list traversal

AI Predicted 4.4 Difficulty: Hard EPSS 0.10% · P1

Possible ATT&CK Techniques 1AI

T1206

Affected Version Matrix 1

VendorProductVersion RangeStatus
XenXenconsult Xen advisory XSA-491unknown
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I. Basic Information for CVE-2026-42487

Vulnerability Information
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Vulnerability Title
x86 HVM I/O port list traversal
Source: NVD (National Vulnerability Database)
Vulnerability Description
HVM guest I/O port accesses are subject to either emulation or at least translation. Translations are managed by the device model (via XEN_DOMCTL_ioport_mapping), and hence the linked list used may changed at any time. Traversal of those lists (while handling guest I/O port accesses) therefore needs synchronizing with updates, which was missing so far.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Xen 竞争条件问题漏洞
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存在竞争条件问题漏洞，该漏洞源于在处理HVM guest I/O端口访问时的竞争条件问题，可能导致权限低的攻击者通过本地访问造成机密性和完整性低影响以及可用性高影响。
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

VendorProductAffected VersionsCPESubscribe
XenXen consult Xen advisory XSA-491 -

II. Public POCs for CVE-2026-42487

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III. Intelligence Information for CVE-2026-42487

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Vendor Advisories for CVE-2026-42487 (1)

Same Patch Batch · Xen · 2026-06-18 · 4 CVEs total

CVE-2026-42490domctl lock open to abuse
CVE-2026-42489domctl lock open to abuse
CVE-2026-42488x86: mismatched mapcache metadata

IV. Related Vulnerabilities

Same product: Xen
Same vendor: Xen

V. Comments for CVE-2026-42487

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