CVE-2025-38688

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.

CVSS 3.1

7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS

0.2% chance of exploitation in the next 30 days; higher than 6% of CVEs (scores of 2026-10-25)

Published

2025-09-04

Modified

2026-10-19

Record from

the NVD, synced 2026-10-21

Affected

• linux:linux_kernel

References

• https://git.kernel.org/stable/c/79fad1917802c28de51a479318a056a6fbe3e2f2
• https://git.kernel.org/stable/c/b42497e3c0e74db061eafad41c0cd7243c46436b
• https://git.kernel.org/stable/c/d19b817540c0abe84854a64ee9ee34cecc3bbeef
• https://git.kernel.org/stable/c/e42a046bb41dcdde4f766a17d8211842007ed537
• https://git.kernel.org/stable/c/ebb6021560b94649bec6b8faba6fe0dca2218e81

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