CVE-2021-3501

Name: CVE-2021-3501
Creator: NVD / NIST
Published: 2021-05-06T13:15:12.84+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.1/10EPSS 0.37%

Last modified Jun 17, 2026

CVE-2021-3501 is a high-severity vulnerability rated 7.1/10 on the CVSS scale. A flaw was found in the Linux kernel in versions before 5.12. The value of internal.ndata, in the KVM API, is mapped to an array index, which can be updated by a user process at anytime which could lead to an out-of-bounds write. EPSS estimates a 0.37% chance of exploitation in the next 30 days.

Description

A flaw was found in the Linux kernel in versions before 5.12. The value of internal.ndata, in the KVM API, is mapped to an array index, which can be updated by a user process at anytime which could lead to an out-of-bounds write. The highest threat from this vulnerability is to data integrity and system availability.

Metrics

CVSS 3.1

7.1/10

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

EPSS Probability

0.37%

29.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-787

Affected Software

Vendor	Product	Versions
Linux	Linux Kernel	< 5.12
Redhat	Enterprise Linux	8.0
Redhat	Enterprise Linux For Real Time	8
Redhat	Enterprise Linux For Real Time For Nfv	8
Redhat	Enterprise Linux For Real Time For Nfv Tus	8.4
Redhat	Enterprise Linux For Real Time Tus	8.4
Fedoraproject	Fedora	33
Redhat	Virtualization	4.0
Redhat	Virtualization Host	4.0
Netapp	Cloud Backup	All versions
Netapp	Solidfire Baseboard Management Controller Firmware	All versions
Netapp	H300s Firmware	All versions
Netapp	H500s Firmware	All versions
Netapp	H700s Firmware	All versions
Netapp	H300e Firmware	All versions
Netapp	H500e Firmware	All versions
Netapp	H700e Firmware	All versions
Netapp	H410s Firmware	All versions
Netapp	H410c Firmware	All versions

References

https://bugzilla.redhat.com/show_bug.cgi?id=1950136Issue Tracking, Patch, Third Party Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=04c4f2ee3f68c9a4bf1653d15f1a9a435ae33f7aMailing List, Patch, Vendor Advisory
https://security.netapp.com/advisory/ntap-20210618-0008/Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1950136Issue Tracking, Patch, Third Party Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=04c4f2ee3f68c9a4bf1653d15f1a9a435ae33f7aMailing List, Patch, Vendor Advisory
https://security.netapp.com/advisory/ntap-20210618-0008/Third Party Advisory

Timeline

Published: May 6, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-3501?

How severe is CVE-2021-3501?

CVE-2021-3501 has a CVSS score of 7.1/10 (HIGH severity). The EPSS model estimates a 0.37% probability of exploitation in the next 30 days.

How do I fix CVE-2021-3501?

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-2021-3501?

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

Scan your code now

Source: NVD / NIST