CVE-2021-4197: Broadcom Brocade Fabric Operating System Firmware

High severity, CVSS 7.8. EPSS: 0.5% chance of exploitation in the next 30 days.

An unprivileged write to the file handler flaw in the Linux kernel's control groups and namespaces subsystem was found in the way users have access to some less privileged process that are controlled by cgroups and have higher privileged parent process. It is actually both for cgroup2 and cgroup1 versions of control groups. A local user could use this flaw to crash the system or escalate their privileges on the system.

Affected products

• Broadcom Brocade Fabric Operating System Firmware: affected versions not specified
• Debian Debian Linux: version 10.0 only
• Linux Linux Kernel: from 4.2, before 4.14.276 (fixed in 4.14.276); from 4.15, before 4.19.238 (fixed in 4.19.238); from 4.20, before 5.4.189 (fixed in 5.4.189); from 5.5, before 5.10.111 (fixed in 5.10.111); from 5.11, before 5.15.14 (fixed in 5.15.14)
• Netapp h300s Firmware: affected versions not specified
• Netapp h410c Firmware: affected versions not specified
• Netapp h410s Firmware: affected versions not specified
• Netapp h500s Firmware: affected versions not specified
• Netapp h700s Firmware: affected versions not specified
• Oracle Communications Cloud Native Core Binding Support Function: version 22.1.1 only; version 22.1.3 only; version 22.2.0 only

Published 2022-03-23. Last modified 2026-06-17.