In the Linux kernel, the following vulnerability has been resolved:

comedi: ni_usb6501: fix NULL-deref in command paths

The driver uses endpoint-sized USB transfer buffers but had no sanity
checks on the sizes. This can lead to zero-size-pointer dereferences or
overflowed transfer buffers in ni6501_port_command() and
ni6501_counter_command() if a (malicious) device has smaller max-packet
sizes than expected (or when doing descriptor fuzz testing).

Add the missing sanity checks to probe().

No CVSS v4.0

Attack Vector Physical

Attack Complexity Low

Privileges Required None

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 0.00036.

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
a03bb00e50ab4c07107da58a52a0bff7943f360c affected < 58478143771b20ab219937b1c30a706590a59224
a03bb00e50ab4c07107da58a52a0bff7943f360c affected < aa39738423503825625853b643b9e99d11c23816
a03bb00e50ab4c07107da58a52a0bff7943f360c affected < df7b1238f3b599a0b9284249772cdfd1ea83a632
a03bb00e50ab4c07107da58a52a0bff7943f360c affected < bc51111bf6e8e7b6cc94b133e4c291273a16acd1
a03bb00e50ab4c07107da58a52a0bff7943f360c affected < b0156b7c9649d8f55a2ce3d3258509f1b2a181c3
a03bb00e50ab4c07107da58a52a0bff7943f360c affected < ef143dc0c3defe56730ecd3a9de7b3e1d7e557c1
a03bb00e50ab4c07107da58a52a0bff7943f360c affected < 4a9d43cb5d5f39fa39fc1da438517004cc95f7ea
a03bb00e50ab4c07107da58a52a0bff7943f360c affected < d6a727a681a39ae4f73081a9bedb45d14f95bdd1
a03bb00e50ab4c07107da58a52a0bff7943f360c affected < 907767da8f3a925b060c740e0b5c92ea7dbec440
Linux Linux affected
Version Status Constraints
3.18 affected —
0 unaffected < 3.18
4.4.292 unaffected ≤ 4.4.*
4.9.290 unaffected ≤ 4.9.*
4.14.255 unaffected ≤ 4.14.*
4.19.217 unaffected ≤ 4.19.*
5.4.159 unaffected ≤ 5.4.*
5.10.79 unaffected ≤ 5.10.*
5.14.18 unaffected ≤ 5.14.*
5.15.2 unaffected ≤ 5.15.*
5.16 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:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

No data.

No data.

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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/4a9d43cb5d5f39fa39fc1da438517004cc95f7ea cve-icon cve-icon
https://git.kernel.org/stable/c/58478143771b20ab219937b1c30a706590a59224 cve-icon cve-icon
https://git.kernel.org/stable/c/907767da8f3a925b060c740e0b5c92ea7dbec440 cve-icon cve-icon
https://git.kernel.org/stable/c/aa39738423503825625853b643b9e99d11c23816 cve-icon cve-icon
https://git.kernel.org/stable/c/b0156b7c9649d8f55a2ce3d3258509f1b2a181c3 cve-icon cve-icon
https://git.kernel.org/stable/c/bc51111bf6e8e7b6cc94b133e4c291273a16acd1 cve-icon cve-icon
https://git.kernel.org/stable/c/d6a727a681a39ae4f73081a9bedb45d14f95bdd1 cve-icon cve-icon
https://git.kernel.org/stable/c/df7b1238f3b599a0b9284249772cdfd1ea83a632 cve-icon cve-icon
https://git.kernel.org/stable/c/ef143dc0c3defe56730ecd3a9de7b3e1d7e557c1 cve-icon cve-icon
https://lore.kernel.org/linux-cve-announce/2024052236-CVE-2021-47476-5a68@gregkh/T cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2021-47476 cve-icon
https://www.cve.org/CVERecord?id=CVE-2021-47476 cve-icon
History

Wed, 02 Apr 2025 15:30:00 +0000

Type Values Removed Values Added
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel

Fri, 01 Nov 2024 15:15:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 4.4, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H'}

 ssvc

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

cvssV3_1

{'score': 4.6, 'vector': 'CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2025-05-04T07:11:45.313Z

Reserved: 2024-05-22T06:20:56.200Z

Link: CVE-2021-47476

cve-icon Vulnrichment

Updated: 2024-08-04T05:39:59.479Z

cve-icon NVD

Status : Analyzed

Published: 2024-05-22T09:15:09.470

Modified: 2025-04-02T15:10:34.063

Link: CVE-2021-47476

cve-icon Redhat

Severity : Low

Publid Date: 2024-05-22T00:00:00Z

Links: CVE-2021-47476 - Bugzilla

cve-icon OpenCVE Enrichment

No data.

Weaknesses