{"id":"CVE-2021-47231","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ncan: mcba_usb: fix memory leak in mcba_usb\n\nSyzbot reported memory leak in SocketCAN driver for Microchip CAN BUS\nAnalyzer Tool. 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's 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","modified":"2026-03-13T05:20:38.413059Z","published":"2024-05-21T15:15:12.477Z","related":["SUSE-SU-2024:1979-1","SUSE-SU-2024:1983-1","SUSE-SU-2024:2010-1","SUSE-SU-2024:2183-1","SUSE-SU-2024:2184-1","SUSE-SU-2024:2185-1","SUSE-SU-2025:01995-1"],"references":[{"type":"FIX","url":"https://git.kernel.org/stable/c/6bd3d80d1f019cefa7011056c54b323f1d8b8e83"},{"type":"FIX","url":"https://git.kernel.org/stable/c/6f87c0e21ad20dd3d22108e33db1c552dfa352a0"},{"type":"FIX","url":"https://git.kernel.org/stable/c/89df95ce32be204eef2e7d4b2f6fb552fb191a68"},{"type":"FIX","url":"https://git.kernel.org/stable/c/91c02557174be7f72e46ed7311e3bea1939840b0"},{"type":"FIX","url":"https://git.kernel.org/stable/c/a115198caaab6d663bef75823a3c5f0802306d60"},{"type":"FIX","url":"https://git.kernel.org/stable/c/d0760a4ef85697bc756d06eae17ae27f3f055401"}],"affected":[{"database_specific":{"unresolved_ranges":[{"events":[{"introduced":"4.12"},{"fixed":"4.14.238"}]},{"events":[{"introduced":"4.15"},{"fixed":"4.19.196"}]},{"events":[{"introduced":"4.20"},{"fixed":"5.4.128"}]},{"events":[{"introduced":"5.5"},{"fixed":"5.10.46"}]},{"events":[{"introduced":"5.11"},{"fixed":"5.12.13"}]},{"events":[{"introduced":"0"},{"last_affected":"5.13-rc1"}]},{"events":[{"introduced":"0"},{"last_affected":"5.13-rc2"}]},{"events":[{"introduced":"0"},{"last_affected":"5.13-rc3"}]},{"events":[{"introduced":"0"},{"last_affected":"5.13-rc4"}]},{"events":[{"introduced":"0"},{"last_affected":"5.13-rc5"}]},{"events":[{"introduced":"0"},{"last_affected":"5.13-rc6"}]}],"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2021-47231.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}