CVE-2025-38688
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-09-04

Last updated on: 2025-11-24

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: iommufd: Prevent ALIGN() overflow When allocating IOVA the candidate range gets aligned to the target alignment. If the range is close to ULONG_MAX then the ALIGN() can wrap resulting in a corrupted iova. Open code the ALIGN() using get_add_overflow() to prevent this. This simplifies the checks as we don't need to check for length earlier either. Consolidate the two copies of this code under a single helper. This bug would allow userspace to create a mapping that overlaps with some other mapping or a reserved range.
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Meta Information
Published
2025-09-04
Last Modified
2025-11-24
Generated
2026-06-16
AI Q&A
2025-09-04
EPSS Evaluated
2026-06-15
NVD
CVE-2025-38688
Affected Vendors & Products
Showing 4 associated CPEs
Vendor Product Version / Range
linux linux_kernel From 5.15.160 (inc) to 5.16 (inc)
linux linux_kernel From 5.15.160 (inc) to 5.16 (inc)
linux linux_kernel From 5.15.160 (inc) to 5.16 (inc)
linux linux_kernel From 5.15.160 (inc) to 5.16 (inc)
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Executive Summary

This vulnerability in the Linux kernel's iommufd component involves an overflow issue in the ALIGN() operation when allocating IOVA (Input-Output Virtual Address) ranges. If the range is near the maximum unsigned long value (ULONG_MAX), the ALIGN() function can wrap around, causing a corrupted IOVA. This allows userspace to create mappings that overlap with other mappings or reserved ranges, potentially leading to unexpected behavior or security issues.

Impact Analysis

The vulnerability can allow userspace processes to create overlapping memory mappings, which may lead to memory corruption, data leakage, or unauthorized access to reserved memory areas. This could compromise system stability or security by enabling unintended interactions between different memory regions.

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