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CVE-2026-42488— x86: mismatched mapcache metadata

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存在缓冲区错误漏洞，该漏洞源于影子分页错误路径在切换页表时未更新当前运行的vCPU引用，导致加载的页表与mapcache元数据不匹配，进而可能破坏mapcache。

AI Predicted 7.8 Difficulty: Moderate EPSS 0.55% · P44

Affected Version Matrix 1

VendorProduct Version RangeStatus
Xen Xen consult Xen advisory XSA-494 unknown
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I. Basic Information for CVE-2026-42488

Vulnerability Information
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Vulnerability Title
x86: mismatched mapcache metadata
Source: CVE Program / CVE List V5
Vulnerability Description
Some shadow paging errors paths will switch the page-tables without updating the currently running vCPU reference. This causes a mismatch between the loaded page-tables and the mapcache metadata which can lead to corruption of the mapcache.
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 缓冲区错误漏洞
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存在缓冲区错误漏洞，该漏洞源于影子分页错误路径在切换页表时未更新当前运行的vCPU引用，导致加载的页表与mapcache元数据不匹配，进而可能破坏mapcache。
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-494 -

II. Public POCs for CVE-2026-42488

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III. Intelligence Information for CVE-2026-42488

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Vendor Advisories for CVE-2026-42488 (1)

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

CVE-2026-42490 domctl lock open to abuse
CVE-2026-42489 domctl lock open to abuse
CVE-2026-42487 x86 HVM I/O port list traversal

IV. Related Vulnerabilities

Same product: Xen
Same vendor: Xen

V. Comments for CVE-2026-42488

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