Security Advisory

CVE-2025-38688

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2025-09-04 15:32:42

Last updated 2026-07-30 05:56:27

Assigner Linux

CVSS score not scored

State PUBLISHED

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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