CVE-2024-42138 mlxsw: core_linecards: Fix double memory deallocation in case of invalid INI file
A double free vulnerability in the mlxsw linecard driver allows attackers to cause a denial of service via an invalid INI file.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2024-42138?
CVE-2024-42138 is a high-severity use after free vulnerability in Linux kernel, published on 30 Jul 2024. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
mlxsw: core_linecards: Fix double memory deallocation in case of invalid INI file
In case of invalid INI file mlxsw_linecard_types_init() deallocates memory but doesn't reset pointer to NULL and returns 0. In case of any error occurred after mlxsw_linecard_types_init() call, mlxsw_linecards_init() calls mlxsw_linecard_types_fini() which performs memory deallocation again.
Add pointer reset to NULL.
Found by Linux Verification Center (linuxtesting.org) with SVACE.
Weakness: CWE-415
Which versions are affected by CVE-2024-42138?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2024-42138?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2024-42138 being exploited?
There is no known exploitation of CVE-2024-42138 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2024-42138, DEBIAN-CVE-2024-42138, GHSA-6j8r-9fpw-hmxp, UBUNTU-CVE-2024-42138.