NULL pointer dereference in Linux kernel spi mcp251xfd driver

1) NULL pointer dereference

EUVDB-ID: #VU93462

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-2021-46995

CWE-ID: CWE-476 - NULL Pointer Dereference

Exploit availability: No

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 mcp251xfd_probe() function in drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c. A local user can perform a denial of service (DoS) attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Linux kernel: 5.12 - 5.13 rc5

CPE2.3

• cpe:2.3:o:linux_foundation:linux_kernel:5.12:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.12:rc1:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.12:rc2:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.12:rc3:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.12:rc4:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.12:rc6:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.12:rc8:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.12.1:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.12.2:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.12.3:*:*:*:*:*:*:*

External links

https://git.kernel.org/stable/c/15f8f96ec7fc35024d4e03296e4d838fcea33d83
https://git.kernel.org/stable/c/4cc7faa406975b460aa674606291dea197c1210c
https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.5
https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.13

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.