#VU90887 Double Free in Linux kernel - CVE-2021-47564

Vulnerability identifier: #VU90887

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-2021-47564

CWE-ID: CWE-415

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 a double free error within the prestera_port_bridge_join() function in drivers/net/ethernet/marvell/prestera/prestera_switchdev.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/5dca8eff4627315df98feec09fff9dfe3356325e
https://git.kernel.org/stable/c/03e5203d2161a00afe4d97d206d2293e40b2f253
https://git.kernel.org/stable/c/e8d032507cb7912baf1d3e0af54516f823befefd

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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.