CVE-2023-3439 Use after free in Linux Kernel (mctp)

What is CVE-2023-3439?

CVE-2023-3439 is a medium-severity use after free vulnerability in Linux kernel, published on 28 Jun 2023. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

A flaw was found in the MCTP protocol in the Linux kernel. The function mctp_unregister() reclaims the device's relevant resource when a netcard detaches. However, a running routine may be unaware of this and cause the use-after-free of the mdev->addrs object, potentially leading to a denial of service.

Weakness: CWE-416

Which versions are affected by CVE-2023-3439?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2023-3439?

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-2023-3439 being exploited?

There is no known exploitation of CVE-2023-3439 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as AZL-27329, AZL-27348, DEBIAN-CVE-2023-3439, GHSA-wh7q-2hgq-2xj7, UBUNTU-CVE-2023-3439.