Vulnerability identifier: #VU90061

Vulnerability risk: Low

CVSSv3.1: 7.7 [AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-47459

CWE-ID: CWE-416

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 escalate privileges on the system.

The vulnerability exists due to a use-after-free error within the j1939_netdev_start() function in net/can/j1939/main.c. A local user can escalate privileges on the system.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Linux kernel:

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External links
http://git.kernel.org/stable/c/a0e47d2833b4f65e6c799f28c6b636d36b8b936d
http://git.kernel.org/stable/c/864e77771a24c877aaf53aee019f78619cbcd668
http://git.kernel.org/stable/c/6e8811707e2df0c6ba920f0cad3a3bca7b42132f
http://git.kernel.org/stable/c/d9d52a3ebd284882f5562c88e55991add5d01586

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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.