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CVE-2026-62428— grant-table: type confusion in grant-copy

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grant-copy操作中的类型混淆，导致权限检查与复制操作不一致，可能允许非特权客户机提升权限至主机，并可能导致信息泄露和拒绝服务。

AI Predicted 7.8 Difficulty: Moderate EPSS 0.12% · P2

Possible ATT&CK Techniques 1 AI

T1611 · Escape to Host

Affected Version Matrix 1

VendorProduct Version RangeStatus
Xen Xen consult Xen advisory XSA-500 unknown
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I. Basic Information for CVE-2026-62428

Vulnerability Information
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Vulnerability Title
grant-table: type confusion in grant-copy
Source: CVE Program / CVE List V5
Vulnerability Description
When grant-copy operations are processed, the respective grant may or may not already be in use by another operation (a mapping or another copy). For all copy operations the referenced guest frame is looked up. When another operation is already active for the grant (the grant is "pinned"), what is being supplied back to actually carry out permission checks and copy operation may not be consistent: The permission check may be carried out on a page different from the one involved in the copy.
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grant-copy操作中的类型混淆，导致权限检查与复制操作不一致，可能允许非特权客户机提升权限至主机，并可能导致信息泄露和拒绝服务。
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-500 -

II. Public POCs for CVE-2026-62428

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III. Intelligence Information for CVE-2026-62428

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Vendor Advisories for CVE-2026-62428 (1)

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

CVE-2026-62434 PoD: Don't try to reclaim special pages
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-2026-62431 Viridian STIMER division by zero
CVE-2026-62424 buffer overruns in libfsimage iso9660 handling
CVE-2026-62423 buffer overruns in libfsimage iso9660 handling
CVE-2026-62425 buffer overruns in libfsimage iso9660 handling
CVE-2026-42495 buffer overruns in libfsimage iso9660 handling
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
CVE-2026-42493 x86 shadow paging is deprecated

IV. Related Vulnerabilities

Same product: Xen
Same vendor: Xen

V. Comments for CVE-2026-62428

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