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CVE-2024-40984

Disclosure Date: July 12, 2024 •
CVE-2024-40984
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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.

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CVSS V3 Severity and Metrics
Base Score:
None
Impact Score:
Unknown
Exploitability Score:
Unknown
Vector:
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Attack Vector (AV):
Unknown
Attack Complexity (AC):
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Privileges Required (PR):
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User Interaction (UI):
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Scope (S):
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Confidentiality (C):
Unknown
Integrity (I):
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Availability (A):
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General Information

Offensive Application
Unknown
Utility Class
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Ports
Unknown
OS
Unknown
Vulnerable Versions
Linux 435ecc978c3d
Linux not down converted
Prerequisites
Unknown
Discovered By
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PoC Author
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Metasploit Module
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Reporter
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Vendors

  • Linux

Products

  • Linux
Technical Analysis