CVE-2021-47407

Name: CVE-2021-47407
Creator: NVD / NIST
Published: 2024-05-21T15:15:26.247+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.5/10EPSS 0.25%

Last modified Jun 17, 2026

CVE-2021-47407 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. 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. EPSS estimates a 0.25% chance of exploitation in the next 30 days.

Description

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]

Metrics

CVSS 3.1

5.5/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

0.25%

16.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-476

Affected Software

Vendor	Product	Versions	Update
Linux	Linux Kernel	< 5.10.71	—
Linux	Linux Kernel	>= 5.11, < 5.14.10	—
Linux	Linux Kernel	5.15	Rc1

References

https://git.kernel.org/stable/c/4664318f73e496cd22c71b10888e75434a123e23Mailing List, Patch
https://git.kernel.org/stable/c/deb2949417677649e2413266d7ce8c2ff73952b4Mailing List, Patch
https://git.kernel.org/stable/c/eb7511bf9182292ef1df1082d23039e856d1ddfbMailing List, Patch
https://git.kernel.org/stable/c/4664318f73e496cd22c71b10888e75434a123e23Mailing List, Patch
https://git.kernel.org/stable/c/deb2949417677649e2413266d7ce8c2ff73952b4Mailing List, Patch
https://git.kernel.org/stable/c/eb7511bf9182292ef1df1082d23039e856d1ddfbMailing List, Patch

Timeline

Published: May 21, 2024
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2021-47407?

How severe is CVE-2021-47407?

CVE-2021-47407 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 0.25% probability of exploitation in the next 30 days.

How do I fix CVE-2021-47407?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-47407?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST