#VU91616 Memory leak in Linux kernel - CVE-2021-47555

Vulnerability identifier: #VU91616

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-2021-47555

CWE-ID: CWE-401

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 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

---

External links
https://git.kernel.org/stable/c/5e44178864b38dd70b877985abd7d86fdb95f27d
https://git.kernel.org/stable/c/6e800ee43218a56acc93676bbb3d93b74779e555
https://git.kernel.org/stable/c/f7fc72a508cf115c273a7a29350069def1041890
https://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.