#VU90407 NULL pointer dereference in Linux kernel - CVE-2021-47445

Vulnerability identifier: #VU90407

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-2021-47445

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 msm_edp_ctrl_power() and msm_edp_ctrl_init() functions in drivers/gpu/drm/msm/edp/edp_ctrl.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/f175b9a83e5c252d7c74acddc792840016caae0a
https://git.kernel.org/stable/c/bacac7d26849c8e903ceb7466d9ce8dc3c2797eb
https://git.kernel.org/stable/c/0cd063aa0a09822cc1620fc59a67fe2f9f6338ac
https://git.kernel.org/stable/c/7f642b93710b6b1119bdff90be01e6b5a2a5d669
https://git.kernel.org/stable/c/f302be08e3de94db8863a0b2958b2bb3e8e998e6
https://git.kernel.org/stable/c/91a340768b012f5b910a203a805b97a345b3db37
https://git.kernel.org/stable/c/46c8ddede0273d1d132beefa9de8b820326982be
https://git.kernel.org/stable/c/2133c4fc8e1348dcb752f267a143fe2254613b34

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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.