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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux51fe6141f0f64ae0bbc096a41a07572273e8c0ef < d19b817540c0abe84854a64ee9ee34cecc3bbeefaffected
LinuxLinux51fe6141f0f64ae0bbc096a41a07572273e8c0ef < ebb6021560b94649bec6b8faba6fe0dca2218e81affected
LinuxLinux51fe6141f0f64ae0bbc096a41a07572273e8c0ef < e42a046bb41dcdde4f766a17d8211842007ed537affected
LinuxLinux51fe6141f0f64ae0bbc096a41a07572273e8c0ef < 79fad1917802c28de51a479318a056a6fbe3e2f2affected
LinuxLinux51fe6141f0f64ae0bbc096a41a07572273e8c0ef < b42497e3c0e74db061eafad41c0cd7243c46436baffected
LinuxLinux6.2affected
LinuxLinux0 < 6.2unaffected
LinuxLinux6.6.103 <= 6.6.*unaffected
LinuxLinux6.12.43 <= 6.12.*unaffected
LinuxLinux6.15.11 <= 6.15.*unaffected
LinuxLinux6.16.2 <= 6.16.*unaffected
LinuxLinux6.17 <= *unaffected

Weaknesses

References