CVE-2021-3506

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.

What this means for your business

It affects Linux Kernel. It matters if your company, or a supplier that handles your data, runs it.
An attacker can use it only with access to the machine itself, with an ordinary user login, and without anyone at your company clicking anything.

What to do

1Check whether your company or your suppliers run Linux Kernel, and which version. The affected versions are listed further down this page.
2If you do, apply the vendor's fix. A patch or vendor advisory has been published.

Not sure if your company is exposed?

Fastnexa’s certified penetration testers can check whether attackers could use this flaw, or others like it, against your websites, apps and network. The full test is free for our first 10 founding clients until 31 December 2026.

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Scoring

CVSS: 7.1 (v3.1)
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Weakness: CWE-125
Assigned by: secalert@redhat.com

Dates

Published: 2021-04-19
Last modified: 2026-09-01
Sources: NVD

Affected products

Linux Linux Kernel- 4.19.191, 4.20 - 5.4.118, 5.5 - 5.10.36, 5.11 - 5.11.20, 5.12 - 5.12.3, 5.12
Debian Debian Linux9.0
Netapp Cloud Backupall versions
Netapp Solidfire Baseboard Management Controller Firmwareall versions
Netapp H300s Firmwareall versions
Netapp H300sall versions
Netapp H500s Firmwareall versions
Netapp H500sall versions
Netapp H700s Firmwareall versions
Netapp H700sall versions
Netapp H300e Firmwareall versions
Netapp H300eall versions

As listed in the NVD configuration data. Not a statement about your estate.