CVE - CVE-2021-47231

CVE-ID
CVE-2021-47231	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
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
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/6bd3d80d1f019cefa7011056c54b323f1d8b8e83 URL:https://git.kernel.org/stable/c/6bd3d80d1f019cefa7011056c54b323f1d8b8e83 MISC:https://git.kernel.org/stable/c/6f87c0e21ad20dd3d22108e33db1c552dfa352a0 URL:https://git.kernel.org/stable/c/6f87c0e21ad20dd3d22108e33db1c552dfa352a0 MISC:https://git.kernel.org/stable/c/89df95ce32be204eef2e7d4b2f6fb552fb191a68 URL:https://git.kernel.org/stable/c/89df95ce32be204eef2e7d4b2f6fb552fb191a68 MISC:https://git.kernel.org/stable/c/91c02557174be7f72e46ed7311e3bea1939840b0 URL:https://git.kernel.org/stable/c/91c02557174be7f72e46ed7311e3bea1939840b0 MISC:https://git.kernel.org/stable/c/a115198caaab6d663bef75823a3c5f0802306d60 URL:https://git.kernel.org/stable/c/a115198caaab6d663bef75823a3c5f0802306d60 MISC:https://git.kernel.org/stable/c/d0760a4ef85697bc756d06eae17ae27f3f055401 URL:https://git.kernel.org/stable/c/d0760a4ef85697bc756d06eae17ae27f3f055401
Assigning CNA
kernel.org
Date Record Created
20240410	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20240410)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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