CVE-2025-71202

A flaw was found in the Linux kernel. This vulnerability, an IOMMU SVA (Input/Output Memory Management Unit Shared Virtual Addressing) coherency issue, affects x86 systems. An unprivileged local user can trigger this by causing the kernel to free and reuse page table memory, while the IOMMU retains stale cached translations. This can lead to memory corruption, resulting in kernel crashes and potentially allowing an attacker to alter kernel memory contents.

An IOMMU SVA coherency issue exists on x86 when the IOMMU keeps stale IOTLB paging cache entries for kernel address space mappings while the kernel frees and reuses kernel page table pages. Without an architectural notification path the IOMMU may continue to use cached translations that reference freed page table memory. Since vfree and kernel page table reclamation are common this can be triggered as part of normal kernel activity once SVA is enabled and at least one mm is bound to a device through iommu_sva_bind_device. Stale IOTLB entries can lead to device DMA using outdated translations. Depending on the device and workload this can result in memory corruption of reused kernel page table pages. That can manifest as kernel crashes and can potentially be abused to alter kernel memory contents.

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.

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.