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redhatcveRedhat.comRH:CVE-2021-47231
HistoryMay 23, 2024 - 2:00 p.m.

CVE-2021-47231

2024-05-2314:00:58
redhat.com
access.redhat.com
3
linux kernel
memory leak
mcba_usb
fixed
vulnerability
can
usb
socketcan
microchip can bus analyzer tool

6.5 Medium

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

10.3%

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

6.5 Medium

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

10.3%