CVE-2025-39699 iommu/riscv: prevent NULL deref in iova_to_phys

What is CVE-2025-39699?

CVE-2025-39699 is a medium-severity vulnerability in Linux kernel, published on 5 Sep 2025. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

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

iommu/riscv: prevent NULL deref in iova_to_phys

The riscv_iommu_pte_fetch() function returns either NULL for unmapped/never-mapped iova, or a valid leaf pte pointer that requires no further validation.

riscv_iommu_iova_to_phys() failed to handle NULL returns. Prevent null pointer dereference in riscv_iommu_iova_to_phys(), and remove the pte validation.

Weakness: CWE-476

Which versions are affected by CVE-2025-39699?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2025-39699?

Apply the vendor's patch.

Is CVE-2025-39699 being exploited?

There is no known exploitation of CVE-2025-39699 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BELL-CVE-2025-39699, DEBIAN-CVE-2025-39699, GHSA-mr69-6c22-jgq8, UBUNTU-CVE-2025-39699.