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

Metrics

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation none

Automatable no

Technical Impact partial

Affected Vendors & Products

No data.

No data.

No data.

References
Link Providers
https://git.kernel.org/stable/c/6bd3d80d1f019cefa7011056c54b323f1d8b8e83 cve-icon cve-icon
https://git.kernel.org/stable/c/6f87c0e21ad20dd3d22108e33db1c552dfa352a0 cve-icon cve-icon
https://git.kernel.org/stable/c/89df95ce32be204eef2e7d4b2f6fb552fb191a68 cve-icon cve-icon
https://git.kernel.org/stable/c/91c02557174be7f72e46ed7311e3bea1939840b0 cve-icon cve-icon
https://git.kernel.org/stable/c/a115198caaab6d663bef75823a3c5f0802306d60 cve-icon cve-icon
https://git.kernel.org/stable/c/d0760a4ef85697bc756d06eae17ae27f3f055401 cve-icon cve-icon
https://lore.kernel.org/linux-cve-announce/2024052138-CVE-2021-47231-c384@gregkh/T cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2021-47231 cve-icon
https://www.cve.org/CVERecord?id=CVE-2021-47231 cve-icon
History

Wed, 06 Nov 2024 20:15:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 5.1, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:L'}

 cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

Mon, 04 Nov 2024 12:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Thu, 15 Aug 2024 16:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2024-05-21T14:19:34.413Z

Updated: 2024-11-06T19:45:06.470Z

Reserved: 2024-04-10T18:59:19.530Z

Link: CVE-2021-47231

cve-icon Vulnrichment

Updated: 2024-08-04T05:32:07.366Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2024-05-21T15:15:12.477

Modified: 2024-11-06T20:35:02.850

Link: CVE-2021-47231

cve-icon Redhat

Severity : Low

Publid Date: 2024-05-21T00:00:00Z

Links: CVE-2021-47231 - Bugzilla