Bug 2525465 (CVE-2026-80699)

Summary: CVE-2026-80699 kernel: KVM: arm64: vgic: Avoid double-deactivate of IRQs in the nested context
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's Kernel-based Virtual Machine (KVM) component for ARM64 architectures. This vulnerability, specifically affecting AmpereOne processors, occurs when a physical interrupt is double-deactivated in a nested virtualization context. An attacker could potentially trigger this condition, leading to the central processing unit (CPU) losing its interrupt pending state and preventing the delivery of future interrupts. This could result in a denial of service (DoS) for the affected system.
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Description OSIDB Bzimport 2026-08-28 07:46:22 UTC 
In the Linux kernel, the following vulnerability has been resolved:

KVM: arm64: vgic: Avoid double-deactivate of IRQs in the nested context

In the nested state, the physical interrupt has already been
deactivated through the HW bit in the LR. The extra deactivation
would be harmless but can hit an errata case on AmpereOne, so
avoid it here.

On AmpereOne, deactivating a physical interrupt through
ICC_DIR_EL1 or ICC_EOIR1_EL1 (depending on EOImode) which is not
active, but is the highest priority pending interrupt causes the
cpu to lose the interrupt pending state and also prevents the
delivery of future interrupts.
Comment 1 gkamathe 2026-09-01 06:50:25 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026082805-CVE-2026-80699-70d6@gregkh/T