---
id: CVE-2024-40984
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ACPICA: Revert "ACPICA: avoid Info: mapping multiple BARs
summary: >-
  In the Linux kernel, the following vulnerability has been resolved:


  ACPICA: Revert "ACPICA: avoid Info: mapping multiple BARs. Your kernel is
  fine."


  Undo the modifications made in commit d410ee5109a1 ("ACPICA: avoid

  "Info: mapping mult…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-476
vendor: linux
product: linux_kernel
affected:
  - 'linux_kernel >= 2.6.32, < 4.19.317'
  - 'linux_kernel >= 4.20, < 5.4.279'
  - 'linux_kernel >= 5.5, < 5.10.221'
  - 'linux_kernel >= 5.11, < 5.15.162'
  - 'linux_kernel >= 5.16, < 6.1.96'
  - 'linux_kernel >= 6.2, < 6.6.36'
  - 'linux_kernel >= 6.7, < 6.9.7'
  - linux_kernel = 6.10
patched:
  - linux_kernel 6.9.7
published: '2024-07-12'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T01:18:39.990'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2024-40984'
references:
  - url: 'https://git.kernel.org/stable/c/434c6b924e1f4c219aab2d9e05fe79c5364e37d3'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/435ecc978c3d5d0c4e172ec5b956dc1904061d98'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/6eca23100e9030725f69c1babacd58803f29ec8d'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/a83e1385b780d41307433ddbc86e3c528db031f0'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/ae465109d82f4fb03c5adbe85f2d6a6a3d59124c'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/dc5017c57f5eee80020c73ff8b67ba7f9fd08b1f'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/ddc1f5f124479360a1fd43f73be950781d172239'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/e21a4c9129c72fa54dd00f5ebf71219b41d43c04'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/434c6b924e1f4c219aab2d9e05fe79c5364e37d3'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/435ecc978c3d5d0c4e172ec5b956dc1904061d98'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/6eca23100e9030725f69c1babacd58803f29ec8d'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/a83e1385b780d41307433ddbc86e3c528db031f0'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/ae465109d82f4fb03c5adbe85f2d6a6a3d59124c'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/dc5017c57f5eee80020c73ff8b67ba7f9fd08b1f'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/ddc1f5f124479360a1fd43f73be950781d172239'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/e21a4c9129c72fa54dd00f5ebf71219b41d43c04'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-265688.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-355557.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-613116.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
tags:
  - nvd
  - cve.org
epss: 0.00299
epssPercentile: 0.22435
ingestedAt: '2026-10-15T03:30:12.724Z'
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2024-09-10T17:02:10.333733Z'
---

## Overview

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

ACPICA: Revert "ACPICA: avoid Info: mapping multiple BARs. Your kernel is fine."

Undo the modifications made in commit d410ee5109a1 ("ACPICA: avoid
"Info: mapping multiple BARs. Your kernel is fine.""). The initial
purpose of this commit was to stop memory mappings for operation
regions from overlapping page boundaries, as it can trigger warnings
if different page attributes are present.

However, it was found that when this situation arises, mapping
continues until the boundary's end, but there is still an attempt to
read/write the entire length of the map, leading to a NULL pointer
deference. For example, if a four-byte mapping request is made but
only one byte is mapped because it hits the current page boundary's
end, a four-byte read/write attempt is still made, resulting in a NULL
pointer deference.

Instead, map the entire length, as the ACPI specification does not
mandate that it must be within the same page boundary. It is
permissible for it to be mapped across different regions.

## Affected

- `linux_kernel >= 2.6.32, < 4.19.317`
- `linux_kernel >= 4.20, < 5.4.279`
- `linux_kernel >= 5.5, < 5.10.221`
- `linux_kernel >= 5.11, < 5.15.162`
- `linux_kernel >= 5.16, < 6.1.96`
- `linux_kernel >= 6.2, < 6.6.36`
- `linux_kernel >= 6.7, < 6.9.7`
- `linux_kernel = 6.10`

## Remediation

Upgrade past the affected range:

- `linux_kernel 6.9.7`