GHSA-P47X-Q59Q-2MPW
Vulnerability from github – Published: 2024-05-21 15:31 – Updated: 2024-11-06 21:30In 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
{
"affected": [],
"aliases": [
"CVE-2021-47231"
],
"database_specific": {
"cwe_ids": [
"CWE-401"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-05-21T15:15:12Z",
"severity": "MODERATE"
},
"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\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",
"id": "GHSA-p47x-q59q-2mpw",
"modified": "2024-11-06T21:30:54Z",
"published": "2024-05-21T15:31:40Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-47231"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/6bd3d80d1f019cefa7011056c54b323f1d8b8e83"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/6f87c0e21ad20dd3d22108e33db1c552dfa352a0"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/89df95ce32be204eef2e7d4b2f6fb552fb191a68"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/91c02557174be7f72e46ed7311e3bea1939840b0"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a115198caaab6d663bef75823a3c5f0802306d60"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d0760a4ef85697bc756d06eae17ae27f3f055401"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
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