Vulnerability CVE-2021-47232
Published: 2024-05-21

Description:
In the Linux kernel, the following vulnerability has been resolved:

can: j1939: fix Use-after-Free, hold skb ref while in use

This patch fixes a Use-after-Free found by the syzbot.

The problem is that a skb is taken from the per-session skb queue,
without incrementing the ref count. This leads to a Use-after-Free if
the skb is taken concurrently from the session queue due to a CTS.

 References:
https://git.kernel.org/stable/c/22cba878abf646cd3a02ee7c8c2cef7afe66a256
https://git.kernel.org/stable/c/509ab6bfdd0c76daebbad0f0af07da712116de22
https://git.kernel.org/stable/c/1071065eeb33d32b7d98c2ce7591881ae7381705
https://git.kernel.org/stable/c/2030043e616cab40f510299f09b636285e0a3678
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