CVE-2026-62432

Severity CVSS v4.0:

Pending analysis

Type:

CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Publication date:

28/07/2026

Last modified:

28/07/2026

Description

The EVTCHNOP_expand_array hypercall checks for whether FIFO event<br /> channels are enabled, but without holding the correct lock. It can race<br /> with EVTCHNOP_reset, resulting in dereferencing a NULL pointer.

Impact

Vector 3.x

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L CVSS v3.1 Severity and Metrics:

Base Score: 7.30 HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): Low
Integrity (I): Low
Availability (A): Low

Base Score 3.x

7.30

Severity 3.x

HIGH

References to Advisories, Solutions, and Tools

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