CVE-2024-40984
"Intel ACPICA NULL Pointer Deference Vulnerability"
Description
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.
INFO
Published Date :
July 12, 2024, 1:15 p.m.
Last Modified :
July 12, 2024, 4:34 p.m.
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Remotely Exploitable :
No
Impact Score :
Exploitability Score :
References to Advisories, Solutions, and Tools
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CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 12, 2024
Action Type Old Value New Value Added Description 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. Added Reference kernel.org https://git.kernel.org/stable/c/435ecc978c3d5d0c4e172ec5b956dc1904061d98 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/ae465109d82f4fb03c5adbe85f2d6a6a3d59124c [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/6eca23100e9030725f69c1babacd58803f29ec8d [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/dc5017c57f5eee80020c73ff8b67ba7f9fd08b1f [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/ddc1f5f124479360a1fd43f73be950781d172239 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/434c6b924e1f4c219aab2d9e05fe79c5364e37d3 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/e21a4c9129c72fa54dd00f5ebf71219b41d43c04 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/a83e1385b780d41307433ddbc86e3c528db031f0 [No types assigned]
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2024-40984 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2024-40984
weaknesses.