---
id: CVE-2025-38676
title: 'iommu/amd: Avoid stack buffer overflow from kernel cmdline'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  iommu/amd: Avoid stack buffer overflow from kernel cmdline

  While the kernel command line is considered trusted in most environments,
  avoid writing 1 byte past the end …
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= f2a5ec7f7b28f9b9cd5fac232ff51019a7f7b9e9 <
    a732502bf3bbe859613b6d7b2b0313b11f0474ac
  - >-
    Linux >= c513043e0afe6a8ba79d00af358655afabb576d2 <
    0ad8509b468fa1058f4f400a1829f29e4ccc4de8
  - >-
    Linux >= 2ae19ac3ea82a5b87a81c10adbb497c9e58bdd60 <
    9ff52d3af0ef286535749e14e3fe9eceb39a8349
  - >-
    Linux >= b6b26d86c61c441144c72f842f7469bb686e1211 <
    8f80c633cba144f721d38d9380f23d23ab7db10e
  - >-
    Linux >= b6b26d86c61c441144c72f842f7469bb686e1211 <
    4bdb0f78bddbfa77d3ab458a21dd9cec495d317a
  - >-
    Linux >= b6b26d86c61c441144c72f842f7469bb686e1211 <
    736db11c86f03e717fc4bf771d05efdf10d23acb
  - >-
    Linux >= b6b26d86c61c441144c72f842f7469bb686e1211 <
    8503d0fcb1086a7cfe26df67ca4bd9bd9e99bdec
  - Linux 5e97dc748d13fad582136ba0c8cec215c7aeeb17
  - Linux 63cd11165e5e0ea2012254c764003eda1f9adb7d
  - Linux >= 5.10.175 < 5.10.241
  - Linux >= 5.15.103 < 5.15.190
  - Linux >= 6.1.16 < 6.1.149
  - Linux >= 5.4.237 < 5.5
  - Linux >= 6.2.3 < 6.3
  - Linux 6.3
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-05T21:06:49.930469Z'
exploitAvailable: true
published: '2025-08-26'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T21:12:52.105Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2025-38676'
references:
  - url: 'https://git.kernel.org/stable/c/a732502bf3bbe859613b6d7b2b0313b11f0474ac'
  - url: 'https://git.kernel.org/stable/c/0ad8509b468fa1058f4f400a1829f29e4ccc4de8'
  - url: 'https://git.kernel.org/stable/c/9ff52d3af0ef286535749e14e3fe9eceb39a8349'
  - url: 'https://git.kernel.org/stable/c/8f80c633cba144f721d38d9380f23d23ab7db10e'
  - url: 'https://git.kernel.org/stable/c/4bdb0f78bddbfa77d3ab458a21dd9cec495d317a'
  - url: 'https://git.kernel.org/stable/c/736db11c86f03e717fc4bf771d05efdf10d23acb'
  - url: 'https://git.kernel.org/stable/c/8503d0fcb1086a7cfe26df67ca4bd9bd9e99bdec'
tags:
  - cve.org
  - exploit-available
epss: 0.00417
epssPercentile: 0.36232
exploits:
  github: 1
  githubRepos:
    - 'https://github.com/14mb1v45h/CVE-2025-38676'
  checkedAt: '2026-11-08T18:56:30.603Z'
ingestedAt: '2026-11-05T22:38:32.009Z'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

iommu/amd: Avoid stack buffer overflow from kernel cmdline

While the kernel command line is considered trusted in most environments,
avoid writing 1 byte past the end of "acpiid" if the "str" argument is
maximum length.

## Affected

- `Linux >= f2a5ec7f7b28f9b9cd5fac232ff51019a7f7b9e9 < a732502bf3bbe859613b6d7b2b0313b11f0474ac`
- `Linux >= c513043e0afe6a8ba79d00af358655afabb576d2 < 0ad8509b468fa1058f4f400a1829f29e4ccc4de8`
- `Linux >= 2ae19ac3ea82a5b87a81c10adbb497c9e58bdd60 < 9ff52d3af0ef286535749e14e3fe9eceb39a8349`
- `Linux >= b6b26d86c61c441144c72f842f7469bb686e1211 < 8f80c633cba144f721d38d9380f23d23ab7db10e`
- `Linux >= b6b26d86c61c441144c72f842f7469bb686e1211 < 4bdb0f78bddbfa77d3ab458a21dd9cec495d317a`
- `Linux >= b6b26d86c61c441144c72f842f7469bb686e1211 < 736db11c86f03e717fc4bf771d05efdf10d23acb`
- `Linux >= b6b26d86c61c441144c72f842f7469bb686e1211 < 8503d0fcb1086a7cfe26df67ca4bd9bd9e99bdec`
- `Linux 5e97dc748d13fad582136ba0c8cec215c7aeeb17`
- `Linux 63cd11165e5e0ea2012254c764003eda1f9adb7d`
- `Linux >= 5.10.175 < 5.10.241`
- `Linux >= 5.15.103 < 5.15.190`
- `Linux >= 6.1.16 < 6.1.149`
- `Linux >= 5.4.237 < 5.5`
- `Linux >= 6.2.3 < 6.3`
- `Linux 6.3`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.