# CVE-2025-68760: linux: In the Linux kernel, the following vulnerability has been resolved:  iommu/amd: Fix potential out-of-bounds read in i...

CVE-2025-68760 is fixed in linux on 1 platform by DEBIAN-CVE-2025-68760 (version 6.17.13-1), released January 5, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2025-68760
- Priority: Routine
- CVSS: n/a
- EPSS: 0.0018
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jan 5, 2026

## Description

In the Linux kernel, the following vulnerability has been resolved:  iommu/amd: Fix potential out-of-bounds read in iommu_mmio_show  In iommu_mmio_write(), it validates the user-provided offset with the check: `iommu->dbg_mmio_offset > iommu->mmio_phys_end - 4`. This assumes a 4-byte access. However, the corresponding show handler, iommu_mmio_show(), uses readq() to perform an 8-byte (64-bit) read.  If a user provides an offset equal to `mmio_phys_end - 4`, the check passes, and will lead to a 4-byte out-of-bounds read.  Fix this by adjusting the boundary check to use sizeof(u64), which corresponds to the size of the readq() operation.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 14 | 6.17.13-1 | [DEBIAN-CVE-2025-68760](https://patchblox.com/security/data/fix/linux/debian-cve-2025-68760.md) | Jan 5, 2026 |

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Data as of 2026-11-09T13:31:49Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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