What is CVE-2021-47307?

CVE-2021-47307 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 2.6.28 onward and patched in 5.4.135, 5.10.53, 5.13.5 and others. CVE-2021-47307 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-47307?

CVE-2021-47307 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-2021-47307?

Yes, CVE-2021-47307 has been patched. Fixed versions include 5.4.135, 5.10.53, 5.13.5 and others. If you are running Linux kernel 2.6.28 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2021-47307 actively exploited?

CVE-2021-47307 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-2021-47307

Medium

In the Linux kernel, the following vulnerability has been resolved: cifs: prevent NULL deref in cifs_compose_mount_options() The optional @ref parameter might contain an NULL node_name, so prevent dereferencing it in cifs_compose_mount_options(). Addresses-Coverity: 1476408 ("Explicit null dereferenced")

Package Linux Kernel

Published 2024-05-21

Last modified 2024-12-26

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

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-2021-47307 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 2.6.28 and later are affected. Fixed in 5.4.135, 5.10.53, 5.13.5, 5.14 and their respective stable series.

Affected from

≥ 2.6.28

Fixed in

✓ 5.4.135 5.4.x ✓ 5.10.53 5.10.x ✓ 5.13.5 5.13.x ✓ 5.14

References

4 total

Kernel Git
https://git.kernel.org/stable/c/03313d1c3a2f086bb60920607ab79ac8f8578306

Patch
Kernel Git
https://git.kernel.org/stable/c/ae3d181f4e912f51af7776ea165f199b16fc165d

Patch
Kernel Git
https://git.kernel.org/stable/c/e58c162789becede894d3e94c0ce6695a2ef5796

Patch
Kernel Git
https://git.kernel.org/stable/c/f7d1fa65e74263d11f90ddd33b4d4cd905a93759

Patch

Details

CVE ID CVE-2021-47307

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2024-05-21

Modified 2024-12-26

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2021-47307?

CVE-2021-47307 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 2.6.28 onward and has been patched in 5.4.135, 5.10.53, 5.13.5 and others. CVE-2021-47307 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-47307?

CVE-2021-47307 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-2021-47307?

Yes. CVE-2021-47307 has been patched. Fixed versions include 5.4.135, 5.10.53, 5.13.5 and others. If you are running Linux kernel 2.6.28 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2021-47307 actively exploited?

No. CVE-2021-47307 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.