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CVE-2021-47231

Disclosure Date: May 21, 2024 •
CVE-2021-47231
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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

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CVSS V3 Severity and Metrics
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General Information

Offensive Application
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OS
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Vulnerable Versions
Linux 89df95ce32be
Linux not down converted
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Vendors

  • Linux

Products

  • Linux
Technical Analysis