What is CVE-2021-47186?

CVE-2021-47186 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, classified as a NULL Pointer Dereference flaw (CWE-476), affecting Linux kernel versions from 5.10 onward and patched in 5.10.82, 5.15.5 and 5.16. CVE-2021-47186 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-47186?

CVE-2021-47186 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-2021-47186?

Yes, CVE-2021-47186 has been patched. Fixed versions include 5.10.82, 5.15.5 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-2021-47186 actively exploited?

CVE-2021-47186 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is NULL Pointer Dereference (CWE-476)?

The product dereferences a pointer that it expects to be valid but is NULL, typically causing a crash. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/476.html

CVE-2021-47186

Medium

In the Linux kernel, the following vulnerability has been resolved: tipc: check for null after calling kmemdup kmemdup can return a null pointer so need to check for it, otherwise the null key will be dereferenced later in tipc_crypto_key_xmit as can be seen in the trace [1]. [1] https://syzkaller.appspot.com/bug?id=bca180abb29567b189efdbdb34cbf7ba851c2a58

Package Linux Kernel

Published 2024-04-10

Last modified 2025-03-04

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-476

CVE-2021-47186 is a NULL Pointer Dereference vulnerability

What is NULL Pointer Dereference?

The product dereferences a pointer that it expects to be valid but is NULL, typically causing a crash. Learn more on MITRE CWE

Affected versions

Linux kernel versions 5.10 and later are affected. Fixed in 5.10.82, 5.15.5, 5.16 and their respective stable series.

Affected from

≥ 5.10

Fixed in

✓ 5.10.82 5.10.x ✓ 5.15.5 5.15.x ✓ 5.16

References

3 total

Kernel Git
https://git.kernel.org/stable/c/3e6db079751afd527bf3db32314ae938dc571916

Patch
Kernel Git
https://git.kernel.org/stable/c/9404c4145542c23019a80ab1bb2ecf73cd057b10

Patch
Kernel Git
https://git.kernel.org/stable/c/a7d91625863d4ffed63b993b5e6dc1298b6430c9

Patch

Details

CVE ID CVE-2021-47186

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2024-04-10

Modified 2025-03-04

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2021-47186?

CVE-2021-47186 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 , classified as a NULL Pointer Dereference flaw (CWE-476) . It affects Linux kernel versions from 5.10 onward and has been patched in 5.10.82, 5.15.5 and 5.16. CVE-2021-47186 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-47186?

CVE-2021-47186 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-2021-47186?

Yes. CVE-2021-47186 has been patched. Fixed versions include 5.10.82, 5.15.5 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-2021-47186 actively exploited?

No. CVE-2021-47186 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.