What is CVE-2021-47091?

CVE-2021-47091 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, classified as a Improper Locking flaw (CWE-667), affecting Linux kernel versions from 5.10 onward and patched in 5.10.89, 5.15.12 and 5.16. CVE-2021-47091 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-47091?

CVE-2021-47091 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-2021-47091?

Yes, CVE-2021-47091 has been patched. Fixed versions include 5.10.89, 5.15.12 and 5.16. If you are running Linux kernel 5.10 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2021-47091 actively exploited?

CVE-2021-47091 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Improper Locking (CWE-667)?

The product does not properly acquire or release a lock, which can lead to unexpected behaviour. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/667.html

CVE-2021-47091

Medium

In the Linux kernel, the following vulnerability has been resolved: mac80211: fix locking in ieee80211_start_ap error path We need to hold the local->mtx to release the channel context, as even encoded by the lockdep_assert_held() there. Fix it.

Package Linux Kernel

Published 2024-03-04

Last modified 2025-02-03

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-667

CVE-2021-47091 is a Improper Locking vulnerability

What is Improper Locking?

The product does not properly acquire or release a lock, which can lead to unexpected behaviour. Learn more on MITRE CWE

Affected versions

Linux kernel versions 5.10 and later are affected. Fixed in 5.10.89, 5.15.12, 5.16 and their respective stable series.

Affected from

≥ 5.10

Fixed in

✓ 5.10.89 5.10.x ✓ 5.15.12 5.15.x ✓ 5.16

References

3 total

Kernel Git
https://git.kernel.org/stable/c/87a270625a89fc841f1a7e21aae6176543d8385c

Patch
Kernel Git
https://git.kernel.org/stable/c/ac61b9c6c0549aaeb98194cf429d93c41bfe5f79

Patch
Kernel Git
https://git.kernel.org/stable/c/c1d1ec4db5f7264cfc21993e59e8f2dcecf4b44f

Patch

Details

CVE ID CVE-2021-47091

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2024-03-04

Modified 2025-02-03

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2021-47091?

CVE-2021-47091 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 , classified as an Improper Locking flaw (CWE-667) . It affects Linux kernel versions from 5.10 onward and has been patched in 5.10.89, 5.15.12 and 5.16. CVE-2021-47091 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-47091?

CVE-2021-47091 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-2021-47091?

Yes. CVE-2021-47091 has been patched. Fixed versions include 5.10.89, 5.15.12 and 5.16. If you are running Linux kernel 5.10 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2021-47091 actively exploited?

No. CVE-2021-47091 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.