Vulnerability identifier: #VU91231

Vulnerability risk: Low

CVSSv3.1: 4.8 [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-2021-47307

CWE-ID: CWE-476

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Linux kernel
Operating systems & Components / Operating system

Vendor: Linux Foundation

Description

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

The vulnerability exists due to NULL pointer dereference within the cifs_compose_mount_options() function in fs/cifs/cifs_dfs_ref.c. A local user can perform a denial of service (DoS) attack.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Linux kernel:

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External links
http://git.kernel.org/stable/c/f7d1fa65e74263d11f90ddd33b4d4cd905a93759
http://git.kernel.org/stable/c/e58c162789becede894d3e94c0ce6695a2ef5796
http://git.kernel.org/stable/c/ae3d181f4e912f51af7776ea165f199b16fc165d
http://git.kernel.org/stable/c/03313d1c3a2f086bb60920607ab79ac8f8578306

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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.