CVE-2022-42896 Info Leak in l2cap_core in the Linux Kernel

What is CVE-2022-42896?

CVE-2022-42896 is a high-severity use after free vulnerability in Linux kernel, published on 23 Nov 2022. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

There are use-after-free vulnerabilities in the Linux kernel's net/bluetooth/l2cap_core.c's l2cap_connect and l2cap_le_connect_req functions which may allow code execution and leaking kernel memory (respectively) remotely via Bluetooth. A remote attacker could execute code leaking kernel memory via Bluetooth if within proximity of the victim.

We recommend upgrading past commit  https://www.google.com/url https://github.com/torvalds/linux/commit/711f8c3fb3db61897080468586b970c87c61d9e4 https://www.google.com/url

Weakness: CWE-416

Which versions are affected by CVE-2022-42896?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2022-42896?

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-2022-42896 being exploited?

There is no known exploitation of CVE-2022-42896 in the wild and no public exploit code.

Public exploit code: 2 proofs of concept on GitHub.

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 DEBIAN-CVE-2022-42896, GHSA-pvw8-76h2-7q32, RHSA-2023:3461, RHSA-2023:3462, RHSA-2023:3517, RHSA-2023:4230 and 2 more.