#VU90837 NULL pointer dereference in Linux kernel - CVE-2021-47464

Vulnerability identifier: #VU90837

Vulnerability 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-2021-47464

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 audit_filter_rules() function in kernel/auditsc.c. A local user can perform a denial of service (DoS) attack.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Linux kernel: All versions

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External links
https://git.kernel.org/stable/c/d6f451f1f60c58d73038c7c3177066f8f084e2a2
https://git.kernel.org/stable/c/16802fa4c33eb1a8efb23f1e93365190e4047d05
https://git.kernel.org/stable/c/4e9e46a700201b4c85081fd478c99c692a9aaa0d
https://git.kernel.org/stable/c/6e3ee990c90494561921c756481d0e2125d8b895

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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.