CVE-2025-38688

Summary

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.

Impact & exploitability

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected products we track (1)

Recommendation

Apply the vendor fix promptly. Open any affected product above for its exact safe version.

Official patch: https://git.kernel.org/stable/c/79fad1917802c28de51a479318a056a6fbe3e2f2 ↗

Additional information

• NVD record
• https://git.kernel.org/stable/c/79fad1917802c28de51a479318a056a6fbe3e2f2Patch
• https://git.kernel.org/stable/c/b42497e3c0e74db061eafad41c0cd7243c46436bPatch
• https://git.kernel.org/stable/c/d19b817540c0abe84854a64ee9ee34cecc3bbeefPatch
• https://git.kernel.org/stable/c/e42a046bb41dcdde4f766a17d8211842007ed537Patch
• https://git.kernel.org/stable/c/ebb6021560b94649bec6b8faba6fe0dca2218e81Patch