What is CVE-2021-47471?

CVE-2021-47471 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 5.10.76, 5.14.15 and 5.15. CVE-2021-47471 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-47471?

CVE-2021-47471 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-2021-47471?

Yes, CVE-2021-47471 has been patched. Fixed versions include 5.10.76, 5.14.15 and 5.15. 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-2021-47471 actively exploited?

CVE-2021-47471 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-2021-47471

Medium

In the Linux kernel, the following vulnerability has been resolved: drm: mxsfb: Fix NULL pointer dereference crash on unload The mxsfb->crtc.funcs may already be NULL when unloading the driver, in which case calling mxsfb_irq_disable() via drm_irq_uninstall() from mxsfb_unload() leads to NULL pointer dereference. Since all we care about is masking the IRQ and mxsfb->base is still valid, just use that to clear and mask the IRQ.

Package Linux Kernel

Published 2024-05-22

Last modified 2025-04-02

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-2021-47471 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 5.10.76, 5.14.15, 5.15 and their respective stable series.

Affected from

≥ 5.10

Fixed in

✓ 5.10.76 5.10.x ✓ 5.14.15 5.14.x ✓ 5.15

References

3 total

Kernel Git
https://git.kernel.org/stable/c/3cfc183052c3dbf8eae57b6c1685dab00ed3db4a

Patch
Kernel Git
https://git.kernel.org/stable/c/b0e6db0656ddfd8bb57303c2ef61ee1c1cc694a8

Patch
Kernel Git
https://git.kernel.org/stable/c/f40c2281d2c0674d32ba732fee45222d76495472

Patch

Details

CVE ID CVE-2021-47471

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2024-05-22

Modified 2025-04-02

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2021-47471?

CVE-2021-47471 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 5.10.76, 5.14.15 and 5.15. CVE-2021-47471 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-47471?

CVE-2021-47471 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-2021-47471?

Yes. CVE-2021-47471 has been patched. Fixed versions include 5.10.76, 5.14.15 and 5.15. 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-2021-47471 actively exploited?

No. CVE-2021-47471 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.