What is CVE-2021-47339?

CVE-2021-47339 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, affecting Linux kernel versions from 5.11 onward and patched in 5.12.18, 5.13.3 and 5.14. CVE-2021-47339 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-47339?

CVE-2021-47339 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:N/I:N/A:H.

Is there a patch available for CVE-2021-47339?

Yes, CVE-2021-47339 has been patched. Fixed versions include 5.12.18, 5.13.3 and 5.14. If you are running Linux kernel 5.11 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2021-47339 actively exploited?

CVE-2021-47339 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2021-47339

Medium

In the Linux kernel, the following vulnerability has been resolved: media: v4l2-core: explicitly clear ioctl input data As seen from a recent syzbot bug report, mistakes in the compat ioctl implementation can lead to uninitialized kernel stack data getting used as input for driver ioctl handlers. The reported bug is now fixed, but it's possible that other related bugs are still present or get added in the future. As the drivers need to check user input already, the possible impact is fairly low, but it might still cause an information leak. To be on the safe side, always clear the entire ioctl buffer before calling the conversion handler functions that are meant to initialize them.

Package Linux Kernel

Published 2024-05-21

Last modified 2025-03-06

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

Low

Integrity

None

Availability

High

Vector string

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

Weakness type

CWE-908

CVE-2021-47339 is classified as CWE-908

See CWE-908 on MITRE CWE for full details on this weakness type.

Affected versions

Linux kernel versions 5.11 and later are affected. Fixed in 5.12.18, 5.13.3, 5.14 and their respective stable series.

Affected from

≥ 5.11

Fixed in

✓ 5.12.18 5.12.x ✓ 5.13.3 5.13.x ✓ 5.14

References

3 total

Kernel Git
https://git.kernel.org/stable/c/7b53cca764f9b291b7907fcd39d9e66ad728ee0b

Patch
Kernel Git
https://git.kernel.org/stable/c/bfb48b54db25c3b4ef4bef5e0691464ebc4aa335

Patch
Kernel Git
https://git.kernel.org/stable/c/dc02c0b2bd6096f2f3ce63e1fc317aeda05f74d8

Patch

Details

CVE ID CVE-2021-47339

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2024-05-21

Modified 2025-03-06

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2021-47339?

CVE-2021-47339 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 . It affects Linux kernel versions from 5.11 onward and has been patched in 5.12.18, 5.13.3 and 5.14. CVE-2021-47339 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-47339?

CVE-2021-47339 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:N/I:N/A:H.
Is there a patch available for CVE-2021-47339?

Yes. CVE-2021-47339 has been patched. Fixed versions include 5.12.18, 5.13.3 and 5.14. If you are running Linux kernel 5.11 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2021-47339 actively exploited?

No. CVE-2021-47339 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.