Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-62432— evtchn: Race between FIFO expand and reset

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EVTCHNOP_expand_array超调用在检查FIFO事件通道时未持有正确的锁，存在竞争条件导致空指针取消引用，可能导致拒绝服务攻击。

AI Predicted 4.4 Difficulty: Hard EPSS 0.32% · P23

Possible ATT&CK Techniques 1 AI

T1211 · Exploitation for Stealth

Affected Version Matrix 1

VendorProduct Version RangeStatus
Xen Xen consult Xen advisory XSA-505 unknown
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-62432

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
evtchn: Race between FIFO expand and reset
Source: CVE Program / CVE List V5
Vulnerability Description
The EVTCHNOP_expand_array hypercall checks for whether FIFO event channels are enabled, but without holding the correct lock. It can race with EVTCHNOP_reset, resulting in dereferencing a NULL pointer.
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EVTCHNOP_expand_array超调用在检查FIFO事件通道时未持有正确的锁，存在竞争条件导致空指针取消引用，可能导致拒绝服务攻击。
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-505 -

II. Public POCs for CVE-2026-62432

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-62432

请登录查看更多情报信息。

Vendor Advisories for CVE-2026-62432 (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-2026-62429 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-2026-62425 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-2026-62432

No comments yet

Leave a comment