CVE-2021-47407

KVM: x86: Handle SRCU initialization failure during page track init

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]

Category

5.5
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.04%
Affected: Linux Linux
Affected: Linux Linux
Published at:
Updated at:

References

Link Tags
https://git.kernel.org/stable/c/deb2949417677649e2413266d7ce8c2ff73952b4 patch mailing list
https://git.kernel.org/stable/c/4664318f73e496cd22c71b10888e75434a123e23 patch mailing list
https://git.kernel.org/stable/c/eb7511bf9182292ef1df1082d23039e856d1ddfb patch mailing list

Frequently Asked Questions

What is the severity of CVE-2021-47407?
CVE-2021-47407 has been scored as a medium severity vulnerability.
How to fix CVE-2021-47407?
To fix CVE-2021-47407, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-47407 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2021-47407 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-47407?
CVE-2021-47407 affects Linux Linux, Linux Linux.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.