CVE-2021-47231 (GCVE-0-2021-47231)
Vulnerability from cvelistv5
Published
2024-05-21 14:19
Modified
2025-05-04 07:06
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
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
Impacted products
Vendor Product Version
Linux Linux Version: 51f3baad7de943780ce0c17bd7975df567dd6e14
Version: 51f3baad7de943780ce0c17bd7975df567dd6e14
Version: 51f3baad7de943780ce0c17bd7975df567dd6e14
Version: 51f3baad7de943780ce0c17bd7975df567dd6e14
Version: 51f3baad7de943780ce0c17bd7975df567dd6e14
Version: 51f3baad7de943780ce0c17bd7975df567dd6e14
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The problem was in unfreed usb_coherent.\\n\\nIn mcba_usb_start() 20 coherent buffers are allocated and there is\\nnothing, that frees them:\\n\\n1) In callback function the urb is resubmitted and that\u0027s all\\n2) In disconnect function urbs are simply killed, but URB_FREE_BUFFER\\n   is not set (see mcba_usb_start) and this flag cannot be used with\\n   coherent buffers.\\n\\nFail log:\\n| [ 1354.053291][ T8413] mcba_usb 1-1:0.0 can0: device disconnected\\n| [ 1367.059384][ T8420] kmemleak: 20 new suspected memory leaks (see /sys/kernel/debug/kmem)\\n\\nSo, all allocated buffers should be freed with usb_free_coherent()\\nexplicitly\\n\\nNOTE:\\nThe same pattern for allocating and freeing coherent buffers\\nis used in drivers/net/can/usb/kvaser_usb/kvaser_usb_core.c\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-11-04T12:01:56.939Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47231\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-11-06T19:45:06.470Z\", \"dateReserved\": \"2024-04-10T18:59:19.530Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-21T14:19:34.413Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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