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

CVE-2025-38688 is fixed in 36 products on 1 platform, first by DEBIAN-CVE-2025-38688, released September 4, 2025. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2025-38688
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0018
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 4, 2025
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-38688

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | kernel-uek ol 10 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek ol 9 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek-core ol 10 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek-core ol 9 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek-debug ol 10 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek-debug ol 9 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek-debug-core ol 10 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek-debug-core ol 9 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek-debug-devel ol 10 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek-debug-devel ol 9 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek-debug-modules ol 10 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek-debug-modules ol 9 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek-debug-modules-core ol 10 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek-debug-modules-core ol 9 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek-debug-modules-deprecated ol 10 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek-debug-modules-deprecated ol 9 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek-debug-modules-desktop ol 10 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek-debug-modules-desktop ol 9 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek-debug-modules-extra ol 10 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek-debug-modules-extra ol 9 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek-debug-modules-extra-netfilter ol 10 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek-debug-modules-extra-netfilter ol 9 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek-debug-modules-usb ol 10 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek-debug-modules-usb ol 9 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek-debug-modules-wireless ol 10 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek-debug-modules-wireless ol 9 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek-devel ol 10 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek-devel ol 9 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek-doc ol 10 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek-doc ol 9 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek-modules ol 10 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek-modules ol 9 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek-modules-core ol 10 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek-modules-core ol 9 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek-modules-deprecated ol 10 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek-modules-deprecated ol 9 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek-modules-desktop ol 10 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek-modules-desktop ol 9 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek-modules-extra ol 10 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek-modules-extra ol 9 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek-modules-extra-netfilter ol 10 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek-modules-extra-netfilter ol 9 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek-modules-usb ol 10 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek-modules-usb ol 9 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek-modules-wireless ol 10 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek-modules-wireless ol 9 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek-tools ol 10 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek-tools ol 9 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek64k ol 10 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek64k ol 9 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek64k-core ol 10 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek64k-core ol 9 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek64k-devel ol 10 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek64k-devel ol 9 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek64k-modules ol 10 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek64k-modules ol 9 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek64k-modules-core ol 10 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek64k-modules-core ol 9 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek64k-modules-deprecated ol 10 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek64k-modules-deprecated ol 9 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek64k-modules-desktop ol 10 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek64k-modules-desktop ol 9 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek64k-modules-extra ol 10 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek64k-modules-extra ol 9 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek64k-modules-extra-netfilter ol 10 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek64k-modules-extra-netfilter ol 9 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek64k-modules-usb ol 10 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek64k-modules-usb ol 9 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek64k-modules-wireless ol 10 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | kernel-uek64k-modules-wireless ol 9 | 0:6.12.0-104.43.4.2.el9uek | [ELSA-2025-20662](https://patchblox.com/security/data/fix/linux/elsa-2025-20662.md) | Oct 14, 2025 |
| Linux | linux Debian 13.5 (trixie) | 6.12.43-1 | [DEBIAN-CVE-2025-38688](https://patchblox.com/security/data/fix/linux/debian-cve-2025-38688.md) | Sep 4, 2025 |
| Linux | linux Debian 14 | 6.16.3-1 | [DEBIAN-CVE-2025-38688](https://patchblox.com/security/data/fix/linux/debian-cve-2025-38688.md) | Sep 4, 2025 |

---

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