What’s Vulnerable › Vulnerabilities

CVE-2025-38688: iommufd: Prevent ALIGN() overflow

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-09-04 · updated 2026-10-19

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.

Affected products

• Linux kernel: from 6.2 before 6.6.103; from 6.7 before 6.12.43; from 6.13 before 6.15.11; from 6.16 before 6.16.2 — fixed in 6.12.43, 6.15.11, 6.16.2, 6.6.103

How to fix

Upgrade to a fixed version: Linux kernel 6.12.43, 6.15.11, 6.16.2, 6.6.103. Check the vendor advisory for mitigations.

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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