CVE-2025-71202

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

iommu/sva: invalidate stale IOTLB entries for kernel address space

Introduce a new IOMMU interface to flush IOTLB paging cache entries for

the CPU kernel address space. This interface is invoked from the x86

architecture code that manages combined user and kernel page tables,

specifically before any kernel page table page is freed and reused.

This addresses the main issue with vfree() which is a common occurrence

and can be triggered by unprivileged users. While this resolves the

primary problem, it doesn't address some extremely rare case related to

memory unplug of memory that was present as reserved memory at boot, which

cannot be triggered by unprivileged users. The discussion can be found at

the link below.

Enable SVA on x86 architecture since the IOMMU can now receive

notification to flush the paging cache before freeing the CPU kernel page

table pages.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References