Memory leak in Linux kernel - CVE-2021-47555
Published: June 10, 2024 / Updated: May 13, 2025
Vulnerability identifier: #VU91616
CSH Severity: Low
CVSSv4.0: 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 access
Exploit availability:
No public exploit available
Vulnerable software:
Linux kernel
Linux kernel
Software vendor:
Linux Foundation
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.
Remediation
Install update from vendor's website.
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
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.83
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.6
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.16
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.163