CVE-2021-47231

In the Linux kernel, the following vulnerability has been resolved: can: mcba_usb: fix memory leak in mcba_usb Syzbot reported memory leak in SocketCAN driver for Microchip CAN BUS Analyzer Tool. The problem was in unfreed usb_coherent. In mcba_usb_start() 20 coherent buffers are allocated and there is nothing, that frees them: 1) In callback function the urb is resubmitted and that's all 2) In disconnect function urbs are simply killed, but URB_FREE_BUFFER is not set (see mcba_usb_start) and this flag cannot be used with coherent buffers. Fail log: | [ 1354.053291][ T8413] mcba_usb 1-1:0.0 can0: device disconnected | [ 1367.059384][ T8420] kmemleak: 20 new suspected memory leaks (see /sys/kernel/debug/kmem) So, all allocated buffers should be freed with usb_free_coherent() explicitly NOTE: The same pattern for allocating and freeing coherent buffers is used in drivers/net/can/usb/kvaser_usb/kvaser_usb_core.c

The following products are affected by CVE-2021-47231 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2021-47231.

URL	Resource
https://git.kernel.org/stable/c/6bd3d80d1f019cefa7011056c54b323f1d8b8e83
https://git.kernel.org/stable/c/6f87c0e21ad20dd3d22108e33db1c552dfa352a0
https://git.kernel.org/stable/c/89df95ce32be204eef2e7d4b2f6fb552fb191a68
https://git.kernel.org/stable/c/91c02557174be7f72e46ed7311e3bea1939840b0
https://git.kernel.org/stable/c/a115198caaab6d663bef75823a3c5f0802306d60
https://git.kernel.org/stable/c/d0760a4ef85697bc756d06eae17ae27f3f055401
https://lore.kernel.org/linux-cve-announce/2024052138-CVE-2021-47231-c384@gregkh/T
https://nvd.nist.gov/vuln/detail/CVE-2021-47231
https://www.cve.org/CVERecord?id=CVE-2021-47231