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

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.

The EPSS score is 0.00008.

Exploitation none

Automatable no

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Linux Linux unaffected
Version Status Constraints
51f3baad7de943780ce0c17bd7975df567dd6e14 affected < 89df95ce32be204eef2e7d4b2f6fb552fb191a68
51f3baad7de943780ce0c17bd7975df567dd6e14 affected < a115198caaab6d663bef75823a3c5f0802306d60
51f3baad7de943780ce0c17bd7975df567dd6e14 affected < 6f87c0e21ad20dd3d22108e33db1c552dfa352a0
51f3baad7de943780ce0c17bd7975df567dd6e14 affected < 6bd3d80d1f019cefa7011056c54b323f1d8b8e83
51f3baad7de943780ce0c17bd7975df567dd6e14 affected < d0760a4ef85697bc756d06eae17ae27f3f055401
51f3baad7de943780ce0c17bd7975df567dd6e14 affected < 91c02557174be7f72e46ed7311e3bea1939840b0
Linux Linux affected
Version Status Constraints
4.12 affected —
0 unaffected < 4.12
4.14.238 unaffected ≤ 4.14.*
4.19.196 unaffected ≤ 4.19.*
5.4.128 unaffected ≤ 5.4.*
5.10.46 unaffected ≤ 5.10.*
5.12.13 unaffected ≤ 5.12.*
5.13 unaffected ≤ *

Configuration 1 [-]

OR cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.13:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.13:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.13:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.13:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.13:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.13:rc6:*:*:*:*:*:*

No data.

No data.

Project Subscriptions

Vendors Products
Linux Subscribe
Linux Kernel Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

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

Fri, 04 Apr 2025 15:00:00 +0000

Type Values Removed Values Added
First Time appeared Linux
Linux linux Kernel
Weaknesses CWE-401
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.13:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.13:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.13:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.13:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.13:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.13:rc6:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel

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'}

Projects

Sign in to view the affected projects.

cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2025-05-04T07:06:47.527Z

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 : Analyzed

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

Modified: 2025-04-04T14:31:28.430

Link: CVE-2021-47231

cve-icon Redhat

Severity : Low

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

Links: CVE-2021-47231 - Bugzilla

cve-icon OpenCVE Enrichment

No data.

Weaknesses