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.
Does this matter?
Lower severity and a low EPSS score (0.23%). Track it; it rarely justifies an emergency change on its own.
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
- CVSS 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.23% probability · 13th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-401
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/6bd3d80d1f019cefa7011056c54b323f1d8b8e83Patch
- https://git.kernel.org/stable/c/6f87c0e21ad20dd3d22108e33db1c552dfa352a0Patch
- https://git.kernel.org/stable/c/89df95ce32be204eef2e7d4b2f6fb552fb191a68Patch
- https://git.kernel.org/stable/c/91c02557174be7f72e46ed7311e3bea1939840b0Patch
- https://git.kernel.org/stable/c/a115198caaab6d663bef75823a3c5f0802306d60Patch
- https://git.kernel.org/stable/c/d0760a4ef85697bc756d06eae17ae27f3f055401Patch
- https://git.kernel.org/stable/c/6bd3d80d1f019cefa7011056c54b323f1d8b8e83Patch
- https://git.kernel.org/stable/c/6f87c0e21ad20dd3d22108e33db1c552dfa352a0Patch
- https://git.kernel.org/stable/c/89df95ce32be204eef2e7d4b2f6fb552fb191a68Patch
- https://git.kernel.org/stable/c/91c02557174be7f72e46ed7311e3bea1939840b0Patch
- https://git.kernel.org/stable/c/a115198caaab6d663bef75823a3c5f0802306d60Patch
- https://git.kernel.org/stable/c/d0760a4ef85697bc756d06eae17ae27f3f055401Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.