Denial of service in Linux kernel btrfs

1) Resource management error

EUVDB-ID: #VU89258

Risk: Low

CVSSv3.1: 4.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-47113

CWE-ID: CWE-399 - Resource Management Errors

Exploit availability: No

Description

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

The vulnerability exists due to improper management of internal resources within the btrfs_rename_exchange() function in fs/btrfs/inode.c. A local user can corrupt the filesystem and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Linux kernel: All versions

External links

http://git.kernel.org/stable/c/0df50d47d17401f9f140dfbe752a65e5d72f9932
http://git.kernel.org/stable/c/ff8de2cec65a8c8521faade12a31b39c80e49f5b
http://git.kernel.org/stable/c/dc09ef3562726cd520c8338c1640872a60187af5

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.