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CVE-2024-40984 is a NULL pointer dereference vulnerability in the Linux kernel's ACPICA component. A change intended to prevent ACPI operation-region memory mappings from crossing page boundaries could truncate a mapping while subsequent reads or writes still used the full requested length. For example, a four-byte mapping request could map only one byte at a page boundary, followed by a four-byte access that triggers a NULL pointer dereference. The fix restores mapping of the entire requested length across page boundaries, as permitted by the ACPI specification.
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A Linux kernel ACPICA vulnerability caused by incorrectly restricting operation-region memory mappings at page boundaries. Accessing the full requested length of a truncated mapping can trigger a NULL pointer dereference and affect availability. The listed CVSS v3 score is 5.5, with local access and low privileges required. The fix restores mapping of the entire requested length.
Linux kernel ACPICA issue addressed by reverting a change related to reporting multiple BAR mappings.
Linux kernel ACPICA flaw addressed by reverting logic associated with mapping multiple PCI Base Address Registers (BARs).
Linux kernel ACPICA vulnerability addressed by reverting handling related to mapping multiple BARs.
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Cross-references every affected SKU, including bundled OEM variants.
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