High 7.8Published Jul 12, 2024

CVE-2024-40984ACPICA: Revert "ACPICA: avoid Info: mapping multiple BARs. Your kernel is fine."

Updated under an hour ago (Oct 27, 2026, 3:30 AM ET)

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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.

CVSS: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 14, 2026
First seen by InfoSec Signals: Oct 14, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from d410ee5109a1633a686a5663c6743a92e1181f9b before 435ecc978c3d5d0c4e172ec5b956dc1904061d98; from d410ee5109a1633a686a5663c6743a92e1181f9b before ae465109d82f4fb03c5adbe85f2d6a6a3d59124c; from d410ee5109a1633a686a5663c6743a92e1181f9b before 6eca23100e9030725f69c1babacd58803f29ec8d; from d410ee5109a1633a686a5663c6743a92e1181f9b before dc5017c57f5eee80020c73ff8b67ba7f9fd08b1f; from d410ee5109a1633a686a5663c6743a92e1181f9b before ddc1f5f124479360a1fd43f73be950781d172239; from d410ee5109a1633a686a5663c6743a92e1181f9b before 434c6b924e1f4c219aab2d9e05fe79c5364e37d3; from d410ee5109a1633a686a5663c6743a92e1181f9b before e21a4c9129c72fa54dd00f5ebf71219b41d43c04; from d410ee5109a1633a686a5663c6743a92e1181f9b before a83e1385b780d41307433ddbc86e3c528db031f0	CNA record
Siemens RUGGEDCOM RST2428P siemens:ruggedcom_rst2428p (from the name)	before V3.1	CISA ADP
Siemens SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family siemens:scalance_xc_300_xr_300_xc_400_xr_500wg_xr_500_family (from the name)	all versions not affected	CISA ADP
Siemens SCALANCE XCM-/XRM-/XCH-/XRH-300 family siemens:scalance_xcm_xrm_xch_xrh_300_family (from the name)	before V3.1	CISA ADP
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name)	before V1.1.1	CISA ADP
linux linux_kernel linux:linux_kernel	from 2.6.32 before 4.19.317; from 4.20 before 5.4.279; from 5.5 before 5.10.221; from 5.11 before 5.15.162; from 5.16 before 6.1.96; from 6.2 before 6.6.36; from 6.7 before 6.9.7; 6.10; and 3 more ranges	NVD

References

References

https://git.kernel.org/stable/c/435ecc978c3d5d0c4e172ec5b956dc1904061d98	patch
https://git.kernel.org/stable/c/ae465109d82f4fb03c5adbe85f2d6a6a3d59124c	patch
https://git.kernel.org/stable/c/6eca23100e9030725f69c1babacd58803f29ec8d	patch
https://git.kernel.org/stable/c/dc5017c57f5eee80020c73ff8b67ba7f9fd08b1f	patch
https://git.kernel.org/stable/c/ddc1f5f124479360a1fd43f73be950781d172239	patch
https://git.kernel.org/stable/c/434c6b924e1f4c219aab2d9e05fe79c5364e37d3	patch
https://git.kernel.org/stable/c/e21a4c9129c72fa54dd00f5ebf71219b41d43c04	patch
https://git.kernel.org/stable/c/a83e1385b780d41307433ddbc86e3c528db031f0	patch
https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
https://cert-portal.siemens.com/productcert/html/ssa-265688.html
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The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.