---
id: CVE-2026-97947
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  x86/amd_node: Fix potential NULL pointer dereference

  amd_smn_read/write() are exported functions around __amd_smn_rw(), so
  they are always available even if amd_smn_in…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  x86/amd_node: Fix potential NULL pointer dereference

  amd_smn_read/write() are exported functions around __amd_smn_rw(), so
  they are always available even if amd_smn_in…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 77466b798d59d6761501ff36094cf430d3876549 <
    fcd19bc829eca237742a3b123f839ad1c473ec85
  - >-
    Linux >= 77466b798d59d6761501ff36094cf430d3876549 <
    a797a2331e5d2ecdbccbae222ea71c759fdb2c2b
  - >-
    Linux >= 77466b798d59d6761501ff36094cf430d3876549 <
    aefdbd574a362dcf7569bada6d72f64a006b9fb9
  - Linux 6.14
published: '2026-09-25'
updated: '2026-09-25'
sourceUpdated: '2026-09-25T11:17:22.213'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-97947'
references:
  - url: 'https://git.kernel.org/stable/c/a797a2331e5d2ecdbccbae222ea71c759fdb2c2b'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/aefdbd574a362dcf7569bada6d72f64a006b9fb9'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/fcd19bc829eca237742a3b123f839ad1c473ec85'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-25T11:06:38.880Z'
---

## Overview

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

x86/amd_node: Fix potential NULL pointer dereference

amd_smn_read/write() are exported functions around __amd_smn_rw(), so
they are always available even if amd_smn_init() fails. In that case,
'amd_roots' is NULL and __amd_smn_rw() will access uninitialized memory.

Then, commit:

  83518453074d ("x86/amd_node: Add SMN offsets to exclusive region access")

added the 'smn_exclusive' flag, which indicated the calls to
pci_request_config_region_exclusive() succeeded, to prevent
concurrent userspace access.

Commit:

  0a4b61d9c2e4 ("x86/amd_node: Fix AMD root device caching")

re-ordered initialization so pci_request_config_region_exclusive() is
called earlier and a failure exits amd_smn_init() before allocating
'amd_roots'. The setting of 'smn_exclusive' moved to the end of
amd_smn_init(), after 'amd_roots' is allocated. It became redundant
and can be removed.

Replace 'smn_exclusive' with directly checking 'amd_roots', to fix a
potential NULL pointer dereference and to simplify the logic.

  [ bp: Reorg commit message, touchup comment. ]
  [ mingo: Rebase & further touchups. ]

## Remediation

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