CVE-2022-3636 Linux Kernel Ethernet mtk_ppe.c __mtk_ppe_check_skb use after free

Medium 5.1 Published 21 Oct 2022 Updated 28 Jul 2026

A use-after-free vulnerability in the Linux Kernel Ethernet driver allows attackers with permissions to potentially execute code or escalate privileges.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Local or same network only
Victim action needed: Not needed
Fix: None listed

What is CVE-2022-3636?

CVE-2022-3636 is a medium-severity use after free vulnerability in Debian Debian Linux, published on 21 Oct 2022. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

A vulnerability was identified in Linux Kernel 33fc42de33278b2b3ec6f3390512987bc29a62b7. This affects the function __mtk_ppe_check_skb of the file drivers/net/ethernet/mediatek/mtk_ppe.c of the component Ethernet Handler. Such manipulation leads to use after free. The name of the patch is 17a5f6a78dc7b8db385de346092d7d9f9dc24df6. It is best practice to apply a patch to resolve this issue. No released Linux Kernel version was ever affected by this CVE.

Weakness: CWE-416, CWE-119

Which versions are affected by CVE-2022-3636?

It affects 2 products.

Products include Debian Debian Linux, Linux kernel.

How do I fix CVE-2022-3636?

No fix has been published for CVE-2022-3636 yet. Limit exposure of the affected software until one is available.

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-2022-3636 being exploited?

There is no known exploitation of CVE-2022-3636 in the wild and no public exploit code.

All Debian Debian Linux vulnerabilities

Sources

Also known as GHSA-wp33-7frp-g7vg, UBUNTU-CVE-2022-3636.