Memory leak in Linux kernel 8021q

1) Memory leak

EUVDB-ID: #VU91616

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-2021-47555

CWE-ID: CWE-401 - Missing release of memory after effective lifetime

Exploit availability: No

Description

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to memory leak within the vlan_dev_init() function in net/8021q/vlan_dev.c, within the register_vlan_dev() function in net/8021q/vlan.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/5e44178864b38dd70b877985abd7d86fdb95f27d
http://git.kernel.org/stable/c/6e800ee43218a56acc93676bbb3d93b74779e555
http://git.kernel.org/stable/c/f7fc72a508cf115c273a7a29350069def1041890
http://git.kernel.org/stable/c/01d9cc2dea3fde3bad6d27f464eff463496e2b00

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.