# CVE-2026-64151: linux: In the Linux kernel, the following vulnerability has been resolved:  iommupt: Check for missing PAGE_SIZE in the pgsi...

CVE-2026-64151 is fixed in linux on 1 platform by DEBIAN-CVE-2026-64151 (version 7.0.12-1), released July 20, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-64151
- Priority: High
- CVSS: 8.4 (high)
- EPSS: 0.0016
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 19, 2026

## Description

In the Linux kernel, the following vulnerability has been resolved:  iommupt: Check for missing PAGE_SIZE in the pgsize_bitmap  Sashiko pointed out that the driver could drop PAGE_SIZE from the pgsize_bitmap. That is technically allowed but nothing does it, and such an iommu_domain would not be used with the DMA API today.  Still, it is against the design and it is trivial to fix up. Lift the PT_WARN_ON to the if branch and just skip the fast path.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 14 | 7.0.12-1 | [DEBIAN-CVE-2026-64151](https://patchblox.com/security/data/fix/linux/debian-cve-2026-64151.md) | Jul 20, 2026 |

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Data as of 2026-11-08T00:53:09Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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