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Unrated severityNVD Advisory· Published May 30, 2024· Updated May 4, 2025

maple_tree: fix mas_empty_area_rev() null pointer dereference

CVE-2024-36891

Description

In the Linux kernel, the following vulnerability has been resolved:

maple_tree: fix mas_empty_area_rev() null pointer dereference

Currently the code calls mas_start() followed by mas_data_end() if the maple state is MA_START, but mas_start() may return with the maple state node == NULL. This will lead to a null pointer dereference when checking information in the NULL node, which is done in mas_data_end().

Avoid setting the offset if there is no node by waiting until after the maple state is checked for an empty or single entry state.

A user could trigger the events to cause a kernel oops by unmapping all vmas to produce an empty maple tree, then mapping a vma that would cause the scenario described above.

Affected products

52

Patches

0

No patches discovered yet.

Vulnerability mechanics

AI mechanics synthesis has not run for this CVE yet.

References

4

News mentions

0

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