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Vulnerability record · CVE-2021-3506 · published 19 April 2021

CVE-2021-3506: Linux kernel out-of-bounds read vulnerability

Linux · Linux Kernel

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.

7.1 CVSS 3.1 High EPSS 0.37% · top 71.5% CWE-125 · Out-of-bounds read
7.1CVSS 3.1 base score, v2 5.6
0.37%EPSS exploitation probability, 30 days
NoNot in CISA KEV
12Affected product versions listed by NVD
12References
1 Sep 2026Last modified by NVD

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.

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

Affected products

12 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.openwall.com/lists/oss-security/2021/05/08/1 Mailing ListPatchThird Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1944298 Issue TrackingThird Party Advisory
https://lists.debian.org/debian-lts-announce/2021/06/msg00019.html Mailing ListThird 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 Mailing ListThird Party Advisory
https://www.openwall.com/lists/oss-security/2021/03/28/2 Mailing ListPatchThird Party Advisory
http://www.openwall.com/lists/oss-security/2021/05/08/1 Mailing ListPatchThird Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1944298 Issue TrackingThird Party Advisory
https://lists.debian.org/debian-lts-announce/2021/06/msg00019.html Mailing ListThird 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 Mailing ListThird Party Advisory
https://www.openwall.com/lists/oss-security/2021/03/28/2 Mailing ListPatchThird Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2021-3506), CISA KEV, FIRST EPSS (scores of 2026-10-11). This page is refreshed as NVD updates the record.