Linux Kernel Use-After-Free Vulnerability in m_can Transmission Handler

A use-after-free vulnerability has been identified in the Linux kernel's m_can transmission handler. This issue arises because the function skbcan_put_echo_skb() clones a socket buffer (skb) and then frees it, creating a potential use-after-free condition. The vulnerability affects the m_can version 3.0.x. The issue has been addressed by moving the skbcan_put_echo_skb() call to before the transmission starts in hardware, aligning it with the 3.1.x branch.

Impact

Exploitation of this vulnerability could lead to a use-after-free condition, potentially allowing for memory corruption or arbitrary code execution.