CVE-2026-43220

About vulnerability

In the Linux kernel, the following vulnerability has been resolved: iommu/amd: serialize sequence allocation under concurrent TLB invalidations With concurrent TLB invalidations, completion wait randomly gets timed out because cmd_sem_val was incremented outside the IOMMU spinlock, allowing CMD_COMPL_WAIT commands to be queued out of sequence and breaking the ordering assumption in wait_on_sem(). Move the cmd_sem_val increment under iommu->lock so completion sequence allocation is serialized with command queuing. And remove the unnecessary return. A flaw was found in the Linux kernel, specifically within the iommu/amd component responsible for managing memory access. This vulnerability arises from an issue in how commands are processed during concurrent memory invalidations, causing them to be queued out of sequence. This can lead to system instability and timeouts, potentially allowing an attacker to trigger a Denial of Service (DoS) condition, rendering the system unavailable.

Live-patch status from KernelCare for each operating system.