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Fencer Vulns
high 7.8

CVE-2024-40984 json

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

published 2024-07-12 2 y ago modified 2026-10-15 25 d ago also EUVD-2024-38779

cvss
7.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 22%
public exploits
0
none known

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 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.

Patch / fix

  • Linux Linux 4.19.317, 5.4.279, 5.10.221, 5.15.162, 6.1.96, 6.6.36, 6.9.7, 6.10
  • Siemens RUGGEDCOM RST2428P V3.1
  • Siemens SCALANCE XCM-/XRM-/XCH-/XRH-300 family V3.1
  • Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem V1.1.1
  • linux Debian 12 6.1.99-1
  • linux Debian 14, Debian 13 6.9.7-1

debian advisories DEBIAN-CVE-2024-40984

  • linux Ubuntu 20.04 LTS 5.4.0-195.215
  • linux Ubuntu 22.04 LTS 5.15.0-121.131
  • linux Ubuntu 24.04 LTS 6.8.0-44.44
  • linux-aws Ubuntu 20.04 LTS 5.4.0-1132.142
  • linux-aws Ubuntu 22.04 LTS 5.15.0-1069.75
  • linux-aws Ubuntu 24.04 LTS 6.8.0-1015.16
  • linux-gcp Ubuntu 20.04 LTS 5.4.0-1136.145
  • linux-gcp Ubuntu 22.04 LTS 5.15.0-1068.76

ubuntu advisories UBUNTU-CVE-2024-40984

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • kernel-rt RHEL 8 4.18.0-553.27.1.rt7.368.el8_10
  • kernel-rt-kvm RHEL 8 4.18.0-553.27.1.rt7.368.el8_10
  • kernel-rt-core RHEL 8 4.18.0-553.27.1.rt7.368.el8_10
  • kernel-rt-modules RHEL 8 4.18.0-553.27.1.rt7.368.el8_10
  • kernel-rt-debug-kvm RHEL 8 4.18.0-553.27.1.rt7.368.el8_10
  • kernel-rt-debug-core RHEL 8 4.18.0-553.27.1.rt7.368.el8_10
  • kernel-rt-debug-modules RHEL 8 4.18.0-553.27.1.rt7.368.el8_10
  • kernel-rt-modules-extra RHEL 8 4.18.0-553.27.1.rt7.368.el8_10

red hat advisories RHSA-2024:8870RHSA-2024:8856RHSA-2024:6991RHSA-2024:6990RHSA-2024:6997RHSA-2024:6745

  • kernel-rt Linux Micro 6.0 6.4.0-10.1
  • kernel-source-rt Linux Micro 6.0 6.4.0-10.1
  • kernel-livepatch-MICRO-6-0-RT_Update_2 Linux Micro 6.0 1-1.1
  • kernel-source Linux Micro 6.0 6.4.0-19.1
  • kernel-default Linux Micro 6.0 6.4.0-19.1
  • kernel-kvmsmall Linux Micro 6.0 6.4.0-19.1
  • kernel-default-base Linux Micro 6.0 6.4.0-17.1.1.51
  • kernel-livepatch-MICRO-6-0_Update_2 Linux Micro 6.0 1-1.1

suse advisories SUSE-SU-2025:20047-1SUSE-SU-2025:20044-1SUSE-SU-2024:3383-1SUSE-SU-2024:3252-1SUSE-SU-2024:3251-1SUSE-SU-2024:3195-1

  • kernel AlmaLinux 8 4.18.0-553.27.1.el8_10
  • perf AlmaLinux 8 4.18.0-553.27.1.el8_10
  • bpftool AlmaLinux 8 4.18.0-553.27.1.el8_10
  • kernel-core AlmaLinux 8 4.18.0-553.27.1.el8_10
  • kernel-tools AlmaLinux 8 4.18.0-553.27.1.el8_10
  • python3-perf AlmaLinux 8 4.18.0-553.27.1.el8_10
  • kernel-modules AlmaLinux 8 4.18.0-553.27.1.el8_10
  • kernel-zfcpdump AlmaLinux 8 4.18.0-553.27.1.el8_10

almalinux advisories ALSA-2024:8856ALSA-2024:8870ALSA-2024:6997

  • kernel-rt Rocky Linux 8 4.18.0-553.27.1.rt7.368.el8_10
  • kernel Rocky Linux 8 4.18.0-553.27.1.el8_10

rocky linux advisories RLSA-2024:8870RLSA-2024:8856

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2024-40984 updated cvss 5.5

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

  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 9 kernel-rt, kernel-rt-kvm, kernel-rt-core, kernel-rt-modules, kernel-rt-debug-kvm, kernel-rt-debug-core, +12 more
    affected: workaround, no fix available
  • Red Hat CodeReady Linux Builder EUS (v.9.2) kernel-debuginfo-common-s390x 5.14.0-284.84.1.el9_2, kernel-debuginfo-common-x86_64 5.14.0-284.84.1.el9_2, kernel-debuginfo-common-aarch64 5.14.0-284.84.1.el9_2, kernel-debuginfo-common-ppc64le 5.14.0-284.84.1.el9_2
    fixed: vendor fix RHSA-2024:6744
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-427.37.1.el9_4, perf 5.14.0-427.37.1.el9_4, rtla 5.14.0-427.37.1.el9_4, kernel-devel-matched 5.14.0-427.37.1.el9_4, kernel-64k-devel-matched 5.14.0-427.37.1.el9_4, kernel-debug-devel-matched 5.14.0-427.37.1.el9_4, +6 more
    fixed: vendor fix RHSA-2024:6997
  • Red Hat Enterprise Linux AppStream E4S (v.9.0) perf 5.14.0-70.117.1.el9_0, kernel-devel-matched 5.14.0-70.117.1.el9_0, kernel-debug-devel-matched 5.14.0-70.117.1.el9_0, kernel-debuginfo-common-s390x 5.14.0-70.117.1.el9_0, kernel-zfcpdump-devel-matched 5.14.0-70.117.1.el9_0, kernel-debuginfo-common-x86_64 5.14.0-70.117.1.el9_0, +2 more
    fixed: vendor fix RHSA-2024:6991
  • Red Hat Enterprise Linux AppStream EUS (v.9.2) perf 5.14.0-284.84.1.el9_2, rtla 5.14.0-284.84.1.el9_2, kernel-devel-matched 5.14.0-284.84.1.el9_2, kernel-64k-devel-matched 5.14.0-284.84.1.el9_2, kernel-debug-devel-matched 5.14.0-284.84.1.el9_2, kernel-debuginfo-common-s390x 5.14.0-284.84.1.el9_2, +5 more
    fixed: vendor fix RHSA-2024:6744
  • Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-553.27.1.el8_10, kernel 4.18.0-553.27.1.el8_10, bpftool 4.18.0-553.27.1.el8_10, kernel-core 4.18.0-553.27.1.el8_10, kernel-tools 4.18.0-553.27.1.el8_10, python3-perf 4.18.0-553.27.1.el8_10, +15 more
    fixed: vendor fix RHSA-2024:8856
  • Red Hat Enterprise Linux BaseOS (v. 9) bpftool 7.3.0-427.37.1.el9_4, kernel 5.14.0-427.37.1.el9_4, kernel-64k 5.14.0-427.37.1.el9_4, kernel-core 5.14.0-427.37.1.el9_4, kernel-tools 5.14.0-427.37.1.el9_4, python3-perf 5.14.0-427.37.1.el9_4, +28 more
    fixed: vendor fix RHSA-2024:6997
show 11 more
  • Red Hat Enterprise Linux BaseOS E4S (v.9.0) kernel 5.14.0-70.117.1.el9_0, bpftool 5.14.0-70.117.1.el9_0, kernel-core 5.14.0-70.117.1.el9_0, kernel-tools 5.14.0-70.117.1.el9_0, python3-perf 5.14.0-70.117.1.el9_0, kernel-modules 5.14.0-70.117.1.el9_0, +14 more
    fixed: vendor fix RHSA-2024:6991
  • Red Hat Enterprise Linux BaseOS EUS (v.9.2) bpftool 7.0.0-284.84.1.el9_2, kernel 5.14.0-284.84.1.el9_2, kernel-64k 5.14.0-284.84.1.el9_2, kernel-core 5.14.0-284.84.1.el9_2, kernel-tools 5.14.0-284.84.1.el9_2, python3-perf 5.14.0-284.84.1.el9_2, +28 more
    fixed: vendor fix RHSA-2024:6744
  • Red Hat Enterprise Linux CRB (v. 8) kernel-debuginfo-common-x86_64 4.18.0-553.27.1.el8_10, kernel-debuginfo-common-aarch64 4.18.0-553.27.1.el8_10, kernel-debuginfo-common-ppc64le 4.18.0-553.27.1.el8_10
    fixed: vendor fix RHSA-2024:8856
  • Red Hat Enterprise Linux CRB (v. 9) libperf 5.14.0-427.37.1.el9_4, kernel-debuginfo-common-s390x 5.14.0-427.37.1.el9_4, kernel-debuginfo-common-x86_64 5.14.0-427.37.1.el9_4, kernel-debuginfo-common-aarch64 5.14.0-427.37.1.el9_4, kernel-debuginfo-common-ppc64le 5.14.0-427.37.1.el9_4
    fixed: vendor fix RHSA-2024:6997
  • Red Hat Enterprise Linux NFV (v. 8) kernel-rt 4.18.0-553.27.1.rt7.368.el8_10, kernel-rt-kvm 4.18.0-553.27.1.rt7.368.el8_10, kernel-rt-core 4.18.0-553.27.1.rt7.368.el8_10, kernel-rt-modules 4.18.0-553.27.1.rt7.368.el8_10, kernel-rt-debug-kvm 4.18.0-553.27.1.rt7.368.el8_10, kernel-rt-debug-core 4.18.0-553.27.1.rt7.368.el8_10, +4 more
    fixed: vendor fix RHSA-2024:8870
  • Red Hat Enterprise Linux NFV (v. 9) kernel-rt 5.14.0-427.37.1.el9_4, kernel-rt-kvm 5.14.0-427.37.1.el9_4, kernel-rt-core 5.14.0-427.37.1.el9_4, kernel-rt-modules 5.14.0-427.37.1.el9_4, kernel-rt-debug-kvm 5.14.0-427.37.1.el9_4, kernel-rt-debug-core 5.14.0-427.37.1.el9_4, +6 more
    fixed: vendor fix RHSA-2024:6997
  • Red Hat Enterprise Linux NFV E4S (v.9.0) kernel-rt 5.14.0-70.117.1.rt21.189.el9_0, kernel-rt-kvm 5.14.0-70.117.1.rt21.189.el9_0, kernel-rt-core 5.14.0-70.117.1.rt21.189.el9_0, kernel-rt-modules 5.14.0-70.117.1.rt21.189.el9_0, kernel-rt-debug-kvm 5.14.0-70.117.1.rt21.189.el9_0, kernel-rt-debug-core 5.14.0-70.117.1.rt21.189.el9_0, +4 more Red Hat Enterprise Linux Real Time E4S (v.9.0) kernel-rt 5.14.0-70.117.1.rt21.189.el9_0, kernel-rt-core 5.14.0-70.117.1.rt21.189.el9_0, kernel-rt-modules 5.14.0-70.117.1.rt21.189.el9_0, kernel-rt-debug-core 5.14.0-70.117.1.rt21.189.el9_0, kernel-rt-debug-modules 5.14.0-70.117.1.rt21.189.el9_0, kernel-rt-modules-extra 5.14.0-70.117.1.rt21.189.el9_0, +2 more
    fixed: vendor fix RHSA-2024:6990
  • Red Hat Enterprise Linux Real Time EUS (v.9.2) kernel-rt 5.14.0-284.84.1.rt14.369.el9_2, kernel-rt-core 5.14.0-284.84.1.rt14.369.el9_2, kernel-rt-modules 5.14.0-284.84.1.rt14.369.el9_2, kernel-rt-debug-core 5.14.0-284.84.1.rt14.369.el9_2, kernel-rt-modules-core 5.14.0-284.84.1.rt14.369.el9_2, kernel-rt-debug-modules 5.14.0-284.84.1.rt14.369.el9_2, +4 more Red Hat Enterprise Linux Real Time for NFV EUS (v.9.2) kernel-rt 5.14.0-284.84.1.rt14.369.el9_2, kernel-rt-kvm 5.14.0-284.84.1.rt14.369.el9_2, kernel-rt-core 5.14.0-284.84.1.rt14.369.el9_2, kernel-rt-modules 5.14.0-284.84.1.rt14.369.el9_2, kernel-rt-debug-kvm 5.14.0-284.84.1.rt14.369.el9_2, kernel-rt-debug-core 5.14.0-284.84.1.rt14.369.el9_2, +6 more
    fixed: vendor fix RHSA-2024:6745
  • Red Hat Enterprise Linux RT (v. 8) kernel-rt 4.18.0-553.27.1.rt7.368.el8_10, kernel-rt-core 4.18.0-553.27.1.rt7.368.el8_10, kernel-rt-modules 4.18.0-553.27.1.rt7.368.el8_10, kernel-rt-debug-core 4.18.0-553.27.1.rt7.368.el8_10, kernel-rt-debug-modules 4.18.0-553.27.1.rt7.368.el8_10, kernel-rt-modules-extra 4.18.0-553.27.1.rt7.368.el8_10, +2 more
    fixed: vendor fix RHSA-2024:8870
  • Red Hat Enterprise Linux RT (v. 9) kernel-rt 5.14.0-427.37.1.el9_4, kernel-rt-core 5.14.0-427.37.1.el9_4, kernel-rt-modules 5.14.0-427.37.1.el9_4, kernel-rt-debug-core 5.14.0-427.37.1.el9_4, kernel-rt-modules-core 5.14.0-427.37.1.el9_4, kernel-rt-debug-modules 5.14.0-427.37.1.el9_4, +4 more
    fixed: vendor fix RHSA-2024:6997
  • Red Hat Enterprise Linux AppStream EUS (v.9.2) kernel-doc 5.14.0-284.84.1.el9_2
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

cisa ICSA-24-102-01 updated cvss 5.5

Siemens SIMATIC S7-1500 TM MFP

  • Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
    affected: mitigation, no fix available

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

cisa ICSA-25-226-07 updated

Siemens Third-Party Components in SINEC OS

  • Siemens RUGGEDCOM RST2428P (6GK6242-6PA00) Siemens SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family Siemens SCALANCE XCM-/XRM-/XCH-/XRH-300 family
    not affected

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

cisa ICSA-25-226-15 updated cvss 5.5

Siemens SINEC OS

  • Siemens RUGGEDCOM RST2428P (6GK6242-6PA00) < 3.1 Siemens SCALANCE XCM-/XRM-/XCH-/XRH-300 family < 3.1
    affected: fixed in V3.1 support.industry.siemens.com
  • Siemens SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family
    not affected

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 y ago

Exploit prediction

0.30% chance of exploitation in the next 30 days, higher than 22% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Linux Linux
  • Siemens RUGGEDCOM RST2428P
  • Siemens SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family
  • Siemens SCALANCE XCM-/XRM-/XCH-/XRH-300 family
  • Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem

Classification

Weakness
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.