CVE-2024-36891: linux kernel Null Dereference — Fix

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.

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CVSS v3.1 Score

5.5

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness Type (CWE)

CWE-476 CWE-476

Affected Products

Vendor	Product	Versions
linux	linux_kernel	6.1 — 6.6.31
linux	linux_kernel	6.7 — 6.8.10

References

Advisories & Patches

https://git.kernel.org/stable/c/6c9c7c1e63b198a8b979ad963eb21410f10ccb00 https://git.kernel.org/stable/c/955a923d2809803980ff574270f81510112be9cf https://git.kernel.org/stable/c/f3956791cf526540addd3295e4c1e0f0442486cc https://git.kernel.org/stable/c/6c9c7c1e63b198a8b979ad963eb21410f10ccb00 https://git.kernel.org/stable/c/955a923d2809803980ff574270f81510112be9cf https://git.kernel.org/stable/c/f3956791cf526540addd3295e4c1e0f0442486cc

Other References

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

Frequently Asked Questions

What is 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 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. It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2024-36891? +

CVE-2024-36891 has a CVSS v3.1 score of 5.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2024-36891? +

CVE-2024-36891 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2024-36891? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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