What is CVE-2021-47401?

CVE-2021-47401 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, affecting Linux kernel versions from 3.5 onward and patched in 4.4.286, 4.9.285, 4.14.249 and others. CVE-2021-47401 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-47401?

CVE-2021-47401 has a CVSS score of 5.5 out of 10, rated Medium severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

Is there a patch available for CVE-2021-47401?

Yes, CVE-2021-47401 has been patched. Fixed versions include 4.4.286, 4.9.285, 4.14.249 and others. If you are running Linux kernel 3.5 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2021-47401 actively exploited?

CVE-2021-47401 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2021-47401

Medium

In the Linux kernel, the following vulnerability has been resolved: ipack: ipoctal: fix stack information leak The tty driver name is used also after registering the driver and must specifically not be allocated on the stack to avoid leaking information to user space (or triggering an oops). Drivers should not try to encode topology information in the tty device name but this one snuck in through staging without anyone noticing and another driver has since copied this malpractice. Fixing the ABI is a separate issue, but this at least plugs the security hole.

Package Linux Kernel

Published 2024-05-21

Last modified 2025-09-26

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

5.5

out of 10

Medium

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Vector string

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

Weakness type

CWE-668

CVE-2021-47401 is classified as CWE-668

See CWE-668 on MITRE CWE for full details on this weakness type.

Affected versions

Linux kernel versions 3.5 and later are affected. Fixed in 4.4.286, 4.9.285, 4.14.249, 4.19.209, 5.4.151, 5.10.71, 5.14.10, 5.15 and their respective stable series.

Affected from

≥ 3.5

Fixed in

✓ 4.4.286 4.4.x ✓ 4.9.285 4.9.x ✓ 4.14.249 4.14.x ✓ 4.19.209 4.19.x ✓ 5.4.151 5.4.x ✓ 5.10.71 5.10.x ✓ 5.14.10 5.14.x ✓ 5.15

References

8 total

Kernel Git
https://git.kernel.org/stable/c/0a9c36a2e06a249acbed64e8e0b84637c2ad7575

Patch
Kernel Git
https://git.kernel.org/stable/c/2725925982dc96a78069cd118ea3d66759bfdad7

Patch
Kernel Git
https://git.kernel.org/stable/c/5f6a309a699675680df15d9b6d389114515b4426

Patch
Kernel Git
https://git.kernel.org/stable/c/741ea2670e021350e54f491106bdaa22dc50e6a0

Patch
Kernel Git
https://git.kernel.org/stable/c/829f13d6079cf7a2465522f39acb43033e9b320d

Patch

Showing 5 of 8 references View all on NVD

Details

CVE ID CVE-2021-47401

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2024-05-21

Modified 2025-09-26

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2021-47401?

CVE-2021-47401 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 . It affects Linux kernel versions from 3.5 onward and has been patched in 4.4.286, 4.9.285, 4.14.249 and others. CVE-2021-47401 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-47401?

CVE-2021-47401 has a CVSS score of 5.5 out of 10, rated Medium severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.
Is there a patch available for CVE-2021-47401?

Yes. CVE-2021-47401 has been patched. Fixed versions include 4.4.286, 4.9.285, 4.14.249 and others. If you are running Linux kernel 3.5 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2021-47401 actively exploited?

No. CVE-2021-47401 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.