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Review reviewHigh

CVE-2025-38688

Linux Linux, linux kernel

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
7.8
EPSS
0.16%
6.00% percentile
CISA KEV
Not listed
Published
2025.09.05
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.16%
Technical severityCVSS 7.8

Vulnerability overview

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 product and versions

Product
Linux Linux, linux kernel
Affected versions
>= 51fe6141f0f64ae0bbc096a41a07572273e8c0ef < d19b817540c0abe84854a64ee9ee34cecc3bbeef, >= 51fe6141f0f64ae0bbc096a41a07572273e8c0ef < ebb6021560b94649bec6b8faba6fe0dca2218e81, >= 51fe6141f0f64ae0bbc096a41a07572273e8c0ef < e42a046bb41dcdde4f766a17d8211842007ed537, >= 51fe6141f0f64ae0bbc096a41a07572273e8c0ef < 79fad1917802c28de51a479318a056a6fbe3e2f2, >= 51fe6141f0f64ae0bbc096a41a07572273e8c0ef < b42497e3c0e74db061eafad41c0cd7243c46436b, >= 6.2, >= 6.2 < 6.6.103, >= 6.7 < 6.12.43, >= 6.13 < 6.15.11, >= 6.16 < 6.16.2
Fixed versions
6.6.103, 6.12.43, 6.15.11, 6.16.2

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
Not available