NULL pointer dereference in Linux kernel dsa microchip driver



| Updated: 2025-05-14
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-47439
CWE-ID CWE-476
Exploitation vector Local
Public exploit N/A
Vulnerable software
 Linux kernel
Operating systems & Components / Operating system

Vendor Linux Foundation

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) NULL pointer dereference

EUVDB-ID: #VU90533

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-2021-47439

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: 5.10 - 5.15 rc7

CPE2.3 External links

https://git.kernel.org/stable/c/f2e1de075018cf71bcd7d628e9f759cb8540b0c3
https://git.kernel.org/stable/c/383239a33cf29ebee9ce0d4e0e5c900b77a16148
https://git.kernel.org/stable/c/ef1100ef20f29aec4e62abeccdb5bdbebba1e378
https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.75
https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.14.14
https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15


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.



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