CVE-2026-98712
Received Received - Intake

Use-After-Free in Linux Kernel KVM ARM64 vgic

Publication date: 2026-10-18

Last updated on: 2026-10-18

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: vgic: Take a refcount on IRQs referenced by last_lr_irq Referencing the last interrupt inserted in an LR is rather fragile, as this interrupt can vanish if a concurrently unmapped LPI. Solve this by bumping up the refcount on the interrupt when populating last_lr_irq, and drop it at vgic_prune_ap_list() time, when LPIs are being reclaimed.

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Meta Information

Published
2026-10-18
Last Modified
2026-10-18
Generated
2026-10-18
AI Q&A
2026-10-18
EPSS Evaluated
N/A
NVD
CVE-2026-98712
EUVD
EUVD-2026-103966

Affected Vendors & Products

Showing 5 associated CPEs
Vendor Product Version / Range
Linux Linux 6da5e537f5afe091658e846da1949d7e557d2ade
Linux Linux 6da5e537f5afe091658e846da1949d7e557d2ade
Linux Linux cd28ca4c27ed5929f61bbed8a967c20519facb88
Linux Linux 6.19.9
Linux Linux 7.0

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Exploitability

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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability in the Linux kernel involves a race condition in the KVM (Kernel-based Virtual Machine) arm64 vgic (Virtual Generic Interrupt Controller) implementation. When an interrupt is referenced in the last_lr_irq structure, it can be removed if the corresponding LPI (List of Pending Interrupts) is unmapped concurrently. The fix ensures the interrupt's reference count is incremented when added to last_lr_irq and decremented when the LPI is reclaimed during vgic_prune_ap_list().

Impact Analysis

This vulnerability could lead to a use-after-free scenario or memory corruption in the Linux kernel, potentially causing system crashes, privilege escalation, or denial of service. It primarily affects virtualization environments using KVM on arm64 systems with virtual interrupt controllers.

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