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A vulnerability in the Linux kernel's KVM subsystem was resolved that involved improper handling of irqfd routing entries when deassigning irqfds. This flaw could break certain architecture-specific IRQ routing functions on x86 and arm64, potentially leading to system compromise. The issue was fixed by ensuring the irqfd's routing entry is not clobbered during deassignment and verifying irqfd activity before consuming routing information. This vulnerability affects linux-aws kernel versions prior to specified patched releases. A patch is available and should be applied to mitigate the risk.

CVE-2026-23198 addresses a vulnerability in the Linux kernel's KVM subsystem where deassigning a KVM_IRQFD improperly clobbers the irqfd's copy of the IRQ's routing entry. This behavior breaks architecture-specific functions such as kvm_arch_irq_bypass_del_producer() on x86 and arm64, which rely on the routing entry type KVM_IRQ_ROUTING_MSI. The fix involves verifying that the irqfd is still active before consuming routing information, preventing erroneous clobbering and ensuring correct routing updates. This vulnerability was resolved in linux-aws kernel versions starting from 5.15.0-1111.118~20.04.1 and later patched versions. The issue is part of a broader set of Linux kernel security fixes addressing multiple subsystems.

Detailed information about UBUNTU-CVE-2026-23198 affecting null linux-aws. Get real-time updates, technical details, and mitigation strategies.

UBUNTU-CVE-2026-23198 - Live Threat Intelligence - Threat Radar | OffSeq.com

Linux aws: In the Linux kernel, the following vulnerability has been resolved: KVM: Don't clobber irqfd routing type when deassigning irqfd When deassigning a… (CVE-2026-23198)

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