---
id: CVE-2026-53325
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  agp/amd64: Fix broken error propagation in agp_amd64_probe()

  A NULL pointer dereference was observed in the AMD64 AGP driver when
  running in a virtualized environment …
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  agp/amd64: Fix broken error propagation in agp_amd64_probe()

  A NULL pointer dereference was observed in the AMD64 AGP driver when
  running in a virtualized environment …
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-476
vendor: linux
product: linux_kernel
affected:
  - 'linux_kernel >= 2.6.18, < 5.10.260'
  - 'linux_kernel >= 5.11, < 5.15.211'
  - 'linux_kernel >= 5.16, < 6.1.177'
  - 'linux_kernel >= 6.2, < 6.6.144'
  - 'linux_kernel >= 6.7, < 6.12.95'
  - 'linux_kernel >= 6.13, < 6.18.37'
  - 'linux_kernel >= 6.19, < 7.0.14'
  - 'linux_kernel >= 7.1, < 7.1.2'
patched:
  - linux_kernel 7.1.2
published: '2026-06-29'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T02:20:09.060'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-53325'
references:
  - url: 'https://git.kernel.org/stable/c/0aa9b27c454c53074cde592eaceb442d30341585'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/1d7d45050e14083c1de1460c93f4063c1f0bca7b'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/3e844a63668d1c3d10a9d347d7ebf161b2f91c84'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/53483a9f4ee9eeb18aa866ec16cce79e136987e1'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/564b3b3f6565313eb6fa5355ffd037d6fb27897f'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/b08472db93b1ccff84a7adec5779d47f0e9d3a30'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/ce800993af477fc24187349c6a20d3073140b759'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/cefe535a60a2e00e09f4b2689b0c8ffc6912459a'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/eb045714bc6a2bbb0befb7a31b996a196e188869'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-784472.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
tags:
  - nvd
  - cve.org
epss: 0.0013
epssPercentile: 0.02586
ingestedAt: '2026-06-29T13:42:12.354Z'
---

## Overview

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

agp/amd64: Fix broken error propagation in agp_amd64_probe()

A NULL pointer dereference was observed in the AMD64 AGP driver when
running in a virtualized environment (e.g. qemu/kvm) without a physical
AMD northbridge. The crash occurs in amd64_fetch_size() when attempting
to dereference the pointer returned by node_to_amd_nb(0).

The root cause of this crash is broken error propagation in
agp_amd64_probe(): When no AMD northbridges are found, cache_nbs()
correctly returns -ENODEV. However, the probe function erroneously
checks the return value against exactly -1, rather than < 0.

As a result, the hardware absence error is masked, allowing the driver
to improperly proceed with initialization. It eventually calls
agp_add_bridge(), which invokes amd64_fetch_size(). Since the hardware
does not exist, node_to_amd_nb(0) returns NULL, leading to a General
Protection Fault (GPF) when accessing its ->misc member.

Fix the issue by correcting the error check in agp_amd64_probe() to
abort properly when cache_nbs() returns any negative error code. This
prevents the driver from erroneously proceeding without hardware, thereby
avoiding the subsequent NULL pointer dereference at its source.

## Affected

- `linux_kernel >= 2.6.18, < 5.10.260`
- `linux_kernel >= 5.11, < 5.15.211`
- `linux_kernel >= 5.16, < 6.1.177`
- `linux_kernel >= 6.2, < 6.6.144`
- `linux_kernel >= 6.7, < 6.12.95`
- `linux_kernel >= 6.13, < 6.18.37`
- `linux_kernel >= 6.19, < 7.0.14`
- `linux_kernel >= 7.1, < 7.1.2`

## Remediation

Upgrade past the affected range:

- `linux_kernel 7.1.2`