01 Record

CVE-2021-47476

comedi: ni_usb6501: fix NULL-deref in command paths

MediumPUBLISHEDCNA: Linux

CNA base score4.6 CVSS v3.xCVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

View raw JSON

02 Description

comedi: ni_usb6501: fix NULL-deref in command paths

03 Exploitation and scoring

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.39% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 31.9% of scored records. A rank, not a probability.

NVD base score

4.6 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

NVD analysis status

Analyzed. NVD last modified this record on 2026-06-17.

Red Hat severity

Low. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2024-05-22 08:19Z2 YR AGO

Last updated

2026-05-11 13:55Z3 MO AGO

Reserved

2024-05-22

Assigning CNA

Linux

Record state

PUBLISHED

Severity

Medium (CVSS 4.6)

CNA CVSS vector

CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weaknesses

CWE-476NULL Pointer DereferenceBase

Data version

5.2

Document digest

b571642dc451b504e0c3ddc085f968e5e8eb0bd34d3435ef8e8ce073cd4a69ba

05 Affected products

VendorProductVersionsPlatforms

LinuxLinuxa03bb00e50ab4c07107da58a52a0bff7943f360c to < 58478143771b20ab219937b1c30a706590a59224, a03bb00e50ab4c07107da58a52a0bff7943f360c to < aa39738423503825625853b643b9e99d11c23816, a03bb00e50ab4c07107da58a52a0bff7943f360c to < df7b1238f3b599a0b9284249772cdfd1ea83a632, a03bb00e50ab4c07107da58a52a0bff7943f360c to < bc51111bf6e8e7b6cc94b133e4c291273a16acd1, a03bb00e50ab4c07107da58a52a0bff7943f360c to < b0156b7c9649d8f55a2ce3d3258509f1b2a181c3, a03bb00e50ab4c07107da58a52a0bff7943f360c to < ef143dc0c3defe56730ecd3a9de7b3e1d7e557c1, a03bb00e50ab4c07107da58a52a0bff7943f360c to < 4a9d43cb5d5f39fa39fc1da438517004cc95f7ea, a03bb00e50ab4c07107da58a52a0bff7943f360c to < d6a727a681a39ae4f73081a9bedb45d14f95bdd1, a03bb00e50ab4c07107da58a52a0bff7943f360c to < 907767da8f3a925b060c740e0b5c92ea7dbec440, 3.18—

06 References

git.kernel.orghttps://git.kernel.org/stable/c/58478143771b20ab219937b1c30a706590a59224
git.kernel.orghttps://git.kernel.org/stable/c/aa39738423503825625853b643b9e99d11c23816
git.kernel.orghttps://git.kernel.org/stable/c/df7b1238f3b599a0b9284249772cdfd1ea83a632
git.kernel.orghttps://git.kernel.org/stable/c/bc51111bf6e8e7b6cc94b133e4c291273a16acd1
git.kernel.orghttps://git.kernel.org/stable/c/b0156b7c9649d8f55a2ce3d3258509f1b2a181c3
git.kernel.orghttps://git.kernel.org/stable/c/ef143dc0c3defe56730ecd3a9de7b3e1d7e557c1
git.kernel.orghttps://git.kernel.org/stable/c/4a9d43cb5d5f39fa39fc1da438517004cc95f7ea
git.kernel.orghttps://git.kernel.org/stable/c/d6a727a681a39ae4f73081a9bedb45d14f95bdd1
git.kernel.orghttps://git.kernel.org/stable/c/907767da8f3a925b060c740e0b5c92ea7dbec440

01 Record index

CVE-2021-47476

02 Description

03 Exploitation and scoring

04 Metadata

05 Affected products

06 References

02 Records

CVE-2021-47476

02 Description

03 Exploitation and scoring

04 Metadata

05 Affected products

06 References