CVE-2024-36891
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…
Does this matter?
Lower severity and a low EPSS score (0.23%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.23% probability · 14th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-476
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/6c9c7c1e63b198a8b979ad963eb21410f10ccb00Patch
- https://git.kernel.org/stable/c/883e5d542bbdddbddeba60250cb482baf3ae2415
- https://git.kernel.org/stable/c/955a923d2809803980ff574270f81510112be9cfPatch
- https://git.kernel.org/stable/c/f3956791cf526540addd3295e4c1e0f0442486ccPatch
- https://git.kernel.org/stable/c/6c9c7c1e63b198a8b979ad963eb21410f10ccb00Patch
- https://git.kernel.org/stable/c/883e5d542bbdddbddeba60250cb482baf3ae2415
- https://git.kernel.org/stable/c/955a923d2809803980ff574270f81510112be9cfPatch
- https://git.kernel.org/stable/c/f3956791cf526540addd3295e4c1e0f0442486ccPatch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.