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

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-62426— sysctl and platform-op locks open to abuse

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sysctl操作中锁获取不提供公平性，且在使用XSM/Flask时锁获取先于权限检查，可能导致低权限实体阻塞高权限实体，造成拒绝服务。

AI Predicted 5.9 Difficulty: Moderate EPSS 0.37% · P29

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
Xen Xen consult Xen advisory XSA-499 unknown
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-62426

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Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.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
sysctl and platform-op locks open to abuse
Source: CVE Program / CVE List V5
Vulnerability Description
[This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] To manage the system, sysctl and platform operations are used by the control domain or a possible Xenstore domain. Some of these operations may not be executed in parallel, so a system-wide lock each is used. The way those locks are acquired is, however, not providing any fairness. Furthermore, with XSM/Flask in use, the lock acquire will, for some operations, occur ahead of any permission checking. The sysctl issue is CVE-2026-62426. The platform-op issue is CVE-2026-62427.
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sysctl操作中锁获取不提供公平性，且在使用XSM/Flask时锁获取先于权限检查，可能导致低权限实体阻塞高权限实体，造成拒绝服务。
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-499 -

II. Public POCs for CVE-2026-62426

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

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-62426

请登录查看更多情报信息。

Vendor Advisories for CVE-2026-62426 (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-2026-62436 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-2026-62426

No comments yet

Leave a comment