Auth bypass in Broadcom Brocade Fabric Operating System Firmware
CVE-2021-4197
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.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.005 (45.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 45th percentile — 45.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- bugzilla.redhat.com/show_bug.cgi (Third Party Advisory, Issue Tracking)
- lore.kernel.org/lkml/20211209214707.805617-1-tj@kernel.org/T/
- www.debian.org/security/2022/dsa-5127 (vendor-advisory, Third Party Advisory)
- www.debian.org/security/2022/dsa-5173 (vendor-advisory, Third Party Advisory)
- www.oracle.com/security-alerts/cpujul2022.html (Third Party Advisory)
- security.netapp.com/advisory/ntap-20220602-0006/ (Third Party Advisory)
Frequently asked questions
- What is CVE-2021-4197?
- CVE-2021-4197 is a high-severity vulnerability in Broadcom Brocade Fabric Operating System Firmware, classified under Improper Authentication. CVSS score: 7.8/10. Published 2022-03-23.
- How severe is CVE-2021-4197?
- High severity. CVSS v3 base score is 7.8 out of 10.
- Is CVE-2021-4197 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.