CVE-2025-39699
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-09-05

Last updated on: 2025-11-25

Assigner: kernel.org

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.
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Meta Information
Published
2025-09-05
Last Modified
2025-11-25
Generated
2026-06-16
AI Q&A
2025-09-05
EPSS Evaluated
2026-06-14
NVD
CVE-2025-39699
Affected Vendors & Products
Showing 3 associated CPEs
Vendor Product Version / Range
linux linux_kernel From 5.15.160 (inc) to 5.16 (inc)
linux linux_kernel 6.17
linux linux_kernel 6.17
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-476 The product dereferences a pointer that it expects to be valid but is NULL.
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Executive Summary

This vulnerability is a NULL pointer dereference in the Linux kernel's riscv_iommu_iova_to_phys() function. The function riscv_iommu_pte_fetch() can return NULL for unmapped or never-mapped I/O virtual addresses (iova), but riscv_iommu_iova_to_phys() did not properly handle these NULL returns, leading to a potential NULL pointer dereference. The fix prevents this by properly handling NULL pointers and removing unnecessary validation.

Impact Analysis

A NULL pointer dereference in kernel code can cause system crashes or instability, potentially leading to denial of service. If exploited, it could disrupt normal system operations on affected Linux systems using the RISC-V IOMMU implementation.

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