High severity8.8NVD Advisory· Published Sep 4, 2025· Updated Jul 30, 2026
CVE-2025-38688
CVE-2025-38688
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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Affected products
4Patches
Vulnerability mechanics
References
5- git.kernel.org/stable/c/79fad1917802c28de51a479318a056a6fbe3e2f2nvdPatch
- git.kernel.org/stable/c/b42497e3c0e74db061eafad41c0cd7243c46436bnvdPatch
- git.kernel.org/stable/c/d19b817540c0abe84854a64ee9ee34cecc3bbeefnvdPatch
- git.kernel.org/stable/c/e42a046bb41dcdde4f766a17d8211842007ed537nvdPatch
- git.kernel.org/stable/c/ebb6021560b94649bec6b8faba6fe0dca2218e81nvdPatch
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