CVE-2024-36891

medium

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.

References

https://git.kernel.org/stable/c/f3956791cf526540addd3295e4c1e0f0442486cc

https://git.kernel.org/stable/c/955a923d2809803980ff574270f81510112be9cf

https://git.kernel.org/stable/c/883e5d542bbdddbddeba60250cb482baf3ae2415

https://git.kernel.org/stable/c/6c9c7c1e63b198a8b979ad963eb21410f10ccb00

Details

Source: Mitre, NVD

Published: 2024-05-30

Updated: 2024-06-16

Risk Information

CVSS v2

Base Score: 4.6

Vector: CVSS2#AV:L/AC:L/Au:S/C:N/I:N/A:C

Severity: Medium

CVSS v3

Base Score: 5.5

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Severity: Medium