CVE-2026-42492— vIRQ event channel binding may break Xenstore
Possible ATT&CK Techniques 1AI
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I. Basic Information for CVE-2026-42492
Vulnerability Information
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Vulnerability Title
vIRQ event channel binding may break Xenstore
Source: CVE Program / CVE List V5
Vulnerability Description
Xenstore, to have an up-to-date picture of the entire system, wants to know of domains appearing and disappearing. To make this more robust, a new XEN_DOMCTL_get_domain_state was introduced. The management of the bitmap underlying that operation is tied into the binding of the VIRQ_DOM_EXC virtual IRQ. Unfortunately an error path there would tear down the bitmap even in cases when it wasn't set up. Unprivileged domains can trigger that error path.
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 4.21版本及之后版本存在安全漏洞，该漏洞源于Xenstore管理域状态时，XEN_DOMCTL_get_domain_state操作中位图管理错误路径导致，非特权域可触发该错误路径，可能造成拒绝服务或hypervisor崩溃。
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
II. Public POCs for CVE-2026-42492
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Vendor Advisories for CVE-2026-42492 (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-2026-42493 | x86 shadow paging is deprecated |
IV. Related Vulnerabilities
V. Comments for CVE-2026-42492
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