CVE Catalog

CVE-2025-71202

HighCVSS 8.8
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.11%

2th percentile - higher than 2% of all known CVEs

Summary

A new IOMMU interface was added to the Linux kernel to flush IOTLB entries for the CPU kernel address space. This fixes the main issue with vfree(), which can be triggered by unprivileged users, but does not cover extremely rare cases of memory unplug of reserved memory.

Risk Assessment

Missing IOTLB flushes could lead to kernel data integrity violations or privilege escalation by unprivileged users.

Recommendation

Immediately update the Linux kernel to a version containing this fix, especially on systems with SVA enabled on x86 architecture.

Other vulnerabilities in Linux kernel

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Original NVD description (English source)

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.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS