---
id: CVE-2026-89818
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  drm/amdgpu/vcn: fix integer overflow in dec_msg buffer count check

  If the supplied msg[2] (num_buffers) is 0x3FFFFFFF, the expression
  6 + num_buffers * 4 wraps to 2 an…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  drm/amdgpu/vcn: fix integer overflow in dec_msg buffer count check

  If the supplied msg[2] (num_buffers) is 0x3FFFFFFF, the expression
  6 + num_buffers * 4 wraps to 2 an…
severity: high
cvss: 7.1
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H'
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 88411caee8f576d6b5abf6531232fcc0ce756dc5 <
    c2340281be4ddacb8c203e2bce59b126d1d6c4c8
  - >-
    Linux >= c72a8b4dc6d598e3831ef3abd9c6527dfbf4810e <
    6dceaeceaa7c8396339f3ea34b0110cb912ca61b
  - >-
    Linux >= 7688143ca62edeecacb3ba0a2cea129dbd262a18 <
    47799e1f893d47d8af231710a61065e3ec8a13e8
  - >-
    Linux >= 63b51e8a9d54317d31cc3856c1e12407070d5fc2 <
    7e28853c78c20bb8ba4c1dba702430cd05e09f76
  - >-
    Linux >= b193019860d61e92da395eae2011f2f6716b182f <
    9ae19bd60891bea0a7b7504cc8dbfe74570ac3b3
  - >-
    Linux >= b193019860d61e92da395eae2011f2f6716b182f <
    4d7390530853eb7befda9cc786e4c86e8ad7ac9e
  - Linux f55552adb100eb54a6e6dabff4fbdc8679bd3fa0
  - Linux 82c535eff05490c71153af57de9fe85502fcb5d5
  - Linux 638d3e0b9eb77aa53fdd60e2b928761d16ba76fa
  - Linux 870c8738c3774336baedddd0240951d078a703b8
  - Linux 638e48ee39d0f2af9336f917a6f5d6692dd64d93
  - Linux e382e0b81a3e7bd21504fee1d01ae8b08f84d3a7
  - Linux 3c817a60b09eaab926e475088e750936efcc95ae
  - Linux >= 6.1.175 < 6.1.188
  - Linux >= 6.6.140 < 6.6.157
  - Linux >= 6.12.90 < 6.12.110
  - Linux >= 6.18.32 < 6.18.51
  - Linux >= 5.15.209 < 5.16
  - Linux >= 7.0.9 < 7.1
  - Linux 7.1
published: '2026-09-16'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T15:18:11.030'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89818'
references:
  - url: 'https://git.kernel.org/stable/c/47799e1f893d47d8af231710a61065e3ec8a13e8'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/4d7390530853eb7befda9cc786e4c86e8ad7ac9e'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/6dceaeceaa7c8396339f3ea34b0110cb912ca61b'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/7e28853c78c20bb8ba4c1dba702430cd05e09f76'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/9ae19bd60891bea0a7b7504cc8dbfe74570ac3b3'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/c2340281be4ddacb8c203e2bce59b126d1d6c4c8'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-16T10:53:54.003Z'
epss: 0.00167
epssPercentile: 0.05213
---

## Overview

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

drm/amdgpu/vcn: fix integer overflow in dec_msg buffer count check

If the supplied msg[2] (num_buffers) is 0x3FFFFFFF, the expression
6 + num_buffers * 4 wraps to 2 and the bounds check passes, letting
the parser loop far past the end of the message BO. Triggering it
additionally requires a ~4GiB mapping so that msg[1] survives the
earlier "header does not fit in BO" check.

Rewrite the test in division form, which is overflow-free by
construction. Also update the message to reflect that msg is invalid.

## Remediation

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