What’s Vulnerable › Vulnerabilities

CVE-2024-27067: xen/evtchn: avoid WARN() when unbinding an event channel

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-05-01 · updated 2026-06-17

Description

In the Linux kernel, the following vulnerability has been resolved: xen/evtchn: avoid WARN() when unbinding an event channel When unbinding a user event channel, the related handler might be called a last time in case the kernel was built with CONFIG_DEBUG_SHIRQ. This might cause a WARN() in the handler. Avoid that by adding an "unbinding" flag to struct user_event which will short circuit the handler.

Affected products

• Linux kernel: from 6.6.19 before 6.6.23; from 6.7 before 6.7.11; from 6.8 before 6.8.2 — fixed in 6.6.23, 6.7.11, 6.8.2

How to fix

Upgrade to a fixed version: Linux kernel 6.6.23, 6.7.11, 6.8.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/35485dad6e28f9b17884764d4692b1655cb848d0
• https://git.kernel.org/stable/c/51c23bd691c0f1fb95b29731c356c6fd69925d17
• https://git.kernel.org/stable/c/99e425032c6ec13584d3cd33846e0c7307501b47
• https://git.kernel.org/stable/c/9e2d4b58c1da48a32905802aaeadba7084b46895
• https://git.kernel.org/stable/c/35485dad6e28f9b17884764d4692b1655cb848d0
• https://git.kernel.org/stable/c/51c23bd691c0f1fb95b29731c356c6fd69925d17
• https://git.kernel.org/stable/c/99e425032c6ec13584d3cd33846e0c7307501b47
• https://git.kernel.org/stable/c/9e2d4b58c1da48a32905802aaeadba7084b46895

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