CVE-2021-3506

Name: CVE-2021-3506
Creator: NVD / NIST
Published: 2021-04-19T22:15:13.11+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.1/10EPSS 0.37%

Last modified Jun 17, 2026

CVE-2021-3506 is a high-severity vulnerability rated 7.1/10 on the CVSS scale. An out-of-bounds (OOB) memory access flaw was found in fs/f2fs/node.c in the f2fs module in the Linux kernel in versions before 5.12.0-rc4. A bounds check failure allows a local attacker to gain access to out-of-bounds memory leading to a system crash or a leak of internal kernel information. EPSS estimates a 0.37% chance of exploitation in the next 30 days.

Description

An out-of-bounds (OOB) memory access flaw was found in fs/f2fs/node.c in the f2fs module in the Linux kernel in versions before 5.12.0-rc4. A bounds check failure allows a local attacker to gain access to out-of-bounds memory leading to a system crash or a leak of internal kernel information. The highest threat from this vulnerability is to system availability.

Metrics

CVSS 3.1

7.1/10

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

EPSS Probability

0.37%

28.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Linux	Linux Kernel	< 5.12
Linux	Linux Kernel	5.12
Debian	Debian Linux	9.0
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

http://www.openwall.com/lists/oss-security/2021/05/08/1Mailing List, Patch, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1944298Issue Tracking, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/06/msg00019.htmlMailing List, Third Party Advisory
https://security.netapp.com/advisory/ntap-20210611-0007/Third Party Advisory
https://www.mail-archive.com/linux-kernel%40vger.kernel.org/msg2520013.html
https://www.openwall.com/lists/oss-security/2021/03/28/2Mailing List, Patch, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/05/08/1Mailing List, Patch, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1944298Issue Tracking, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/06/msg00019.htmlMailing List, Third Party Advisory
https://security.netapp.com/advisory/ntap-20210611-0007/Third Party Advisory
https://www.mail-archive.com/linux-kernel%40vger.kernel.org/msg2520013.html
https://www.openwall.com/lists/oss-security/2021/03/28/2Mailing List, Patch, Third Party Advisory

Timeline

Published: Apr 19, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-3506?

How severe is CVE-2021-3506?

CVE-2021-3506 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-2021-3506?

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-2021-3506?

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

Scan your code now

Source: NVD / NIST