What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 7.3 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: 2026-07-28 · updated 2026-07-28
• Weakness: CWE-362

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.

References

• https://xenbits.xenproject.org/xsa/advisory-505.html
• http://www.openwall.com/lists/oss-security/2026/07/28/21
• http://xenbits.xen.org/xsa/advisory-505.html

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