CVE-2021-4154

HIGH

Linux Kernel < 5.4.134 - Use After Free

Title source: rule

Description

A use-after-free flaw was found in cgroup1_parse_param in kernel/cgroup/cgroup-v1.c in the Linux kernel's cgroup v1 parser. A local attacker with a user privilege could cause a privilege escalation by exploiting the fsconfig syscall parameter leading to a container breakout and a denial of service on the system.

Exploits (2)

nomisec WORKING POC 67 stars
by Markakd · poc
https://github.com/Markakd/CVE-2021-4154
nomisec WORKING POC 7 stars
by veritas501 · poc
https://github.com/veritas501/CVE-2021-4154

Scores

CVSS v3 8.8
EPSS 0.0084
EPSS Percentile 74.4%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Classification

CWE
CWE-416
Status published

Affected Products (11)

linux/linux_kernel < 5.4.134
linux/linux_kernel
redhat/virtualization
redhat/enterprise_linux
netapp/hci_baseboard_management_controller
netapp/hci_baseboard_management_controller
netapp/hci_baseboard_management_controller
netapp/hci_baseboard_management_controller
netapp/hci_baseboard_management_controller
netapp/hci_baseboard_management_controller
netapp/hci_baseboard_management_controller

Timeline

Published Feb 04, 2022
Tracked Since Feb 18, 2026