CVE-2021-4197: broadcom brocade_fabric_operating_system_firmware Improper Authentication
Vulnerability summary
CVE-2021-4197 is a high (CVSS 7.8) Improper Authentication vulnerability in broadcom brocade_fabric_operating_system_firmware. EPSS estimates a 0.54% chance of exploitation in the next 30 days, higher than 45.2% of scored vulnerabilities.
Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 33 · Related 25Timeline
- 23-03-2022PublishedVulnerability first disclosed.
- 03-08-2024Last modifiedVulnerability information updated.
Description
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.
CVSS metrics
5 scores · 3 sources · 3 versions- OSV · UbuntuEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.54%
Chance of exploitation in the next 30 days
Percentile
45%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.54% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu69 products
- linux< 4.4.0-229.263 | < 4.15.0-189.200 | < 5.4.0-117.132
- linux-aws< 4.4.0-1109.115 | < 4.4.0-1145.160 | < 4.15.0-1137.148 | < 5.4.0-1078.84
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
- linux-aws-5.13< 5.13.0-1019.21~20.04.1
Netapp5 products
Debian2 products
- linux< 5.15.15-1
- debian_linuxEOL10.0
Broadcom1 product
Linux1 product
- linux_kernel≥ 4.2, < 4.14.276 | ≥ 4.15, < 4.19.238 | ≥ 4.20, < 5.4.189 | ≥ 5.5, < 5.10.111 | ≥ 5.11, < 5.15.14
Oracle1 product
- communications_cloud_native_core_binding_support_function22.1.1 | 22.1.3 | 22.2.0
6 vendors · 79 products
References
20 links- lore.kernel.org/lkml/20211209214707.805617-1-tj%40kernel.org/T/X Refsource MISC
