Vulnerability CVE-2023-52887
Published: 2024-07-29

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

net: can: j1939: enhanced error handling for tightly received RTS messages in xtp_rx_rts_session_new

This patch enhances error handling in scenarios with RTS (Request to
Send) messages arriving closely. It replaces the less informative WARN_ON_ONCE
backtraces with a new error handling method. This provides clearer error
messages and allows for the early termination of problematic sessions.
Previously, sessions were only released at the end of j1939_xtp_rx_rts().

Potentially this could be reproduced with something like:
testj1939 -r vcan0:0x80 &
while true; do
# send first RTS
cansend vcan0 18EC8090#1014000303002301;
# send second RTS
cansend vcan0 18EC8090#1014000303002301;
# send abort
cansend vcan0 18EC8090#ff00000000002301;
done

 References:
https://git.kernel.org/stable/c/ed581989d7ea9df6f8646beba2341e32cd49a1f9
https://git.kernel.org/stable/c/f6c839e717901dbd6b1c1ca807b6210222eb70f6
https://git.kernel.org/stable/c/1762ca80c2b72dd1b5821c5e347713ae696276ea
https://git.kernel.org/stable/c/26b18dd30e63d4fd777be429148e8e4ed66f60b2
https://git.kernel.org/stable/c/177e33b655d35d72866b50aec84307119dc5f3d4
https://git.kernel.org/stable/c/0bc0a7416ea73f79f915c9a05ac0858dff65cfed
https://git.kernel.org/stable/c/d3e2904f71ea0fe7eaff1d68a2b0363c888ea0fb
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