Bug 2508014 (CVE-2026-62431)

Summary: CVE-2026-62431 xen: Xen: Denial of Service due to division by zero in Viridian STIMER handling
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
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Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Xen. The logic responsible for handling periodic Viridian STIMERs performs a division operation using a value that can be controlled by a user. If a malicious user sets this divisor value to zero, it can lead to a division-by-zero error, resulting in a #DE fault and causing a Denial of Service (DoS) to the system.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2508146    
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Description OSIDB Bzimport 2026-07-28 14:02:04 UTC 
The logic to handle periodic Viridian STIMERs performs a division with an
unchecked user-controlled divisor value, that can be set to zero to cause a #DE
fault.