CVE-2021-47231 (GCVE-0-2021-47231)

Vulnerability from cvelistv5 – Published: 2024-05-21 14:19 – Updated: 2026-05-11 13:50
VLAI
Title
can: mcba_usb: fix memory leak in mcba_usb
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
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 51f3baad7de943780ce0c17bd7975df567dd6e14 , < 89df95ce32be204eef2e7d4b2f6fb552fb191a68 (git)
Affected: 51f3baad7de943780ce0c17bd7975df567dd6e14 , < a115198caaab6d663bef75823a3c5f0802306d60 (git)
Affected: 51f3baad7de943780ce0c17bd7975df567dd6e14 , < 6f87c0e21ad20dd3d22108e33db1c552dfa352a0 (git)
Affected: 51f3baad7de943780ce0c17bd7975df567dd6e14 , < 6bd3d80d1f019cefa7011056c54b323f1d8b8e83 (git)
Affected: 51f3baad7de943780ce0c17bd7975df567dd6e14 , < d0760a4ef85697bc756d06eae17ae27f3f055401 (git)
Affected: 51f3baad7de943780ce0c17bd7975df567dd6e14 , < 91c02557174be7f72e46ed7311e3bea1939840b0 (git)
Create a notification for this product.
Linux Linux Affected: 4.12
Unaffected: 0 , < 4.12 (semver)
Unaffected: 4.14.238 , ≤ 4.14.* (semver)
Unaffected: 4.19.196 , ≤ 4.19.* (semver)
Unaffected: 5.4.128 , ≤ 5.4.* (semver)
Unaffected: 5.10.46 , ≤ 5.10.* (semver)
Unaffected: 5.12.13 , ≤ 5.12.* (semver)
Unaffected: 5.13 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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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\"},{\"lang\":\"es\",\"value\":\" En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: can: mcba_usb: repara la p\u00e9rdida de memoria en mcba_usb. Syzbot inform\u00f3 una p\u00e9rdida de memoria en el controlador SocketCAN para la herramienta Microchip CAN BUS Analyzer. El problema estaba en usb_coherent no liberado. En mcba_usb_start() se asignan 20 buffers coherentes y no hay nada que los libere: 1) En la funci\u00f3n de devoluci\u00f3n de llamada, la urb se vuelve a enviar y eso es todo 2) En la funci\u00f3n de desconexi\u00f3n, las urbs simplemente se eliminan, pero URB_FREE_BUFFER no est\u00e1 configurado (ver mcba_usb_start) y Esta bandera no se puede utilizar con buffers coherentes. Registro de errores: | [ 1354.053291][ T8413] mcba_usb 1-1:0.0 can0: dispositivo desconectado | [ 1367.059384][ T8420] kmemleak: 20 nuevas p\u00e9rdidas de memoria sospechosas (ver /sys/kernel/debug/kmem) Por lo tanto, todos los buffers asignados deben liberarse con usb_free_coherent() expl\u00edcitamente NOTA: Se utiliza el mismo patr\u00f3n para asignar y liberar buffers coherentes en 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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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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.