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CVE-2026-42493— x86 shadow paging is deprecated

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x86影子分页功能被弃用，可能导致未授权的客户机造成拒绝服务影响整个主机。

AI Predicted 5.3 Difficulty: Theoretical EPSS 0.61% · P47

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 1

VendorProduct Version RangeStatus
Xen Xen consult Xen advisory XSA-495 unknown
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I. Basic Information for CVE-2026-42493

Vulnerability Information
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Vulnerability Title
x86 shadow paging is deprecated
Source: CVE Program / CVE List V5
Vulnerability Description
Addressing certain issues, in particular related to operations which may take excessively long and therefore would need preemption, has turned out overly costly. Since alternatives (HVM/PVH: HAP, PV: shim) are commonly available, the decision was to deprecate the functionality, while still retaining it for people to use at their own (security) risk. Memory-wise small enough guests may still be okay to run.
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x86影子分页功能被弃用，可能导致未授权的客户机造成拒绝服务影响整个主机。
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-495 -

II. Public POCs for CVE-2026-42493

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III. Intelligence Information for CVE-2026-42493

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Vendor Advisories for CVE-2026-42493 (1)

Same Patch Batch · Xen · 2026-07-28 · 18 CVEs total

CVE-2026-62425 buffer overruns in libfsimage iso9660 handling
CVE-2026-62430 x86: Out-of-bounds read in vRTC emulation
CVE-2026-62432 evtchn: Race between FIFO expand and reset
CVE-2026-62429 vNUMA domain cleanup may race other operations
CVE-2026-62433 correct buffer checks for DM_OP hypercalls
CVE-2026-62428 grant-table: type confusion in grant-copy
CVE-2026-62431 Viridian STIMER division by zero
CVE-2026-62424 buffer overruns in libfsimage iso9660 handling
CVE-2026-62423 buffer overruns in libfsimage iso9660 handling
CVE-2026-42495 buffer overruns in libfsimage iso9660 handling
CVE-2026-62434 PoD: Don't try to reclaim special pages
CVE-2026-62426 sysctl and platform-op locks open to abuse
CVE-2026-62436 grant-table: version change racing with other operations
CVE-2026-62427 sysctl and platform-op locks open to abuse
CVE-2026-62435 grant-table: version change racing with other operations
CVE-2026-42494 buffer overruns in libfsimage iso9660 handling
CVE-2026-42492 vIRQ event channel binding may break Xenstore

IV. Related Vulnerabilities

Same product: Xen
Same vendor: Xen

V. Comments for CVE-2026-42493

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