NULL pointer dereference in Linux kernel dsa microchip driver

1) NULL pointer dereference

EUVDB-ID: #VU90533

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-2021-47439

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 EXPORT_SYMBOL() function in drivers/net/dsa/microchip/ksz_common.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

CPE2.3

External links

http://git.kernel.org/stable/c/f2e1de075018cf71bcd7d628e9f759cb8540b0c3
http://git.kernel.org/stable/c/383239a33cf29ebee9ce0d4e0e5c900b77a16148
http://git.kernel.org/stable/c/ef1100ef20f29aec4e62abeccdb5bdbebba1e378

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.