Improper locking in Linux kernel f2fs



| Updated: 2025-05-14
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2020-36775
CWE-ID CWE-667
Exploitation vector Local
Public exploit N/A
Vulnerable software
 Linux kernel
Operating systems & Components / Operating system

Vendor Linux Foundation

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Improper locking

EUVDB-ID: #VU90808

Risk: Low

CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-36775

CWE-ID: CWE-667 - Improper Locking

Exploit availability: No

Description

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to improper locking within the f2fs_write_node_pages() function in fs/f2fs/node.c, within the __f2fs_write_data_pages() function in fs/f2fs/data.c. A local user can perform a denial of service (DoS) attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Linux kernel: 5.4 - 5.6.6

CPE2.3 External links

https://git.kernel.org/stable/c/0478ccdc8ea016de1ebaf6fe6da0275c2b258c5b
https://git.kernel.org/stable/c/8e8542437bb4070423c9754d5ba270ffdbae8c8d
https://git.kernel.org/stable/c/df77fbd8c5b222c680444801ffd20e8bbc90a56e
https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.189
https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.6.7
https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.7


Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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