What is CVE-2021-47407?

CVE-2021-47407 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 4.6 onward and patched in 5.10.71, 5.14.10 and 5.15. CVE-2021-47407 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-47407?

CVE-2021-47407 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-2021-47407?

Yes, CVE-2021-47407 has been patched. Fixed versions include 5.10.71, 5.14.10 and 5.15. If you are running Linux kernel 4.6 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2021-47407 actively exploited?

CVE-2021-47407 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-2021-47407

Medium

In the Linux kernel, the following vulnerability has been resolved: KVM: x86: Handle SRCU initialization failure during page track init Check the return of init_srcu_struct(), which can fail due to OOM, when initializing the page track mechanism. Lack of checking leads to a NULL pointer deref found by a modified syzkaller. [Move the call towards the beginning of kvm_arch_init_vm. - Paolo]

Package Linux Kernel

Published 2024-05-21

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-2021-47407 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 4.6 and later are affected. Fixed in 5.10.71, 5.14.10, 5.15 and their respective stable series.

Affected from

≥ 4.6

Fixed in

✓ 5.10.71 5.10.x ✓ 5.14.10 5.14.x ✓ 5.15

References

3 total

Kernel Git
https://git.kernel.org/stable/c/4664318f73e496cd22c71b10888e75434a123e23

Mailing List Patch
Kernel Git
https://git.kernel.org/stable/c/deb2949417677649e2413266d7ce8c2ff73952b4

Mailing List Patch
Kernel Git
https://git.kernel.org/stable/c/eb7511bf9182292ef1df1082d23039e856d1ddfb

Mailing List Patch

Details

CVE ID CVE-2021-47407

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2024-05-21

Modified 2025-03-04

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2021-47407?

CVE-2021-47407 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 4.6 onward and has been patched in 5.10.71, 5.14.10 and 5.15. CVE-2021-47407 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-47407?

CVE-2021-47407 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-2021-47407?

Yes. CVE-2021-47407 has been patched. Fixed versions include 5.10.71, 5.14.10 and 5.15. If you are running Linux kernel 4.6 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2021-47407 actively exploited?

No. CVE-2021-47407 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.