CVE-2026-43161

A flaw was found in the Linux kernel's Intel IOMMU (Input/Output Memory Management Unit) virtual technology for directed I/O (VT-d) subsystem. When a PCIe (Peripheral Component Interconnect Express) endpoint device, especially when passed through to userspace applications like QEMU or DPDK, unexpectedly loses its connection, the system can experience a hard-lock. This occurs because the IOMMU waits indefinitely for an invalidation request that cannot complete, leading to a Denial of Service (DoS) for the host system.

Red Hat acknowledges the upstream Linux kernel correction for «iommu/vt-d» as described in COMMENT_ZERO. Fixes are delivered through standard kernel errata for supported products. Operational exposure depends on whether this subsystem or driver is active in your configuration.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.