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CVE-2021-4197

HIGHCVSS 7.8/10EPSS 0.54%

Last modified

CVE-2021-4197 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. 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. EPSS estimates a 0.54% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
7.8/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability
0.54%

41.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
LinuxLinux Kernel>= 4.2, < 4.14.276
LinuxLinux Kernel>= 4.15, < 4.19.238
LinuxLinux Kernel>= 4.20, < 5.4.189
LinuxLinux Kernel>= 5.5, < 5.10.111
LinuxLinux Kernel>= 5.11, < 5.15.14
OracleCommunications Cloud Native Core Binding Support Function22.1.1
OracleCommunications Cloud Native Core Binding Support Function22.1.3
OracleCommunications Cloud Native Core Binding Support Function22.2.0
DebianDebian Linux10.0
BroadcomBrocade Fabric Operating System FirmwareAll versions
NetappH300s FirmwareAll versions
NetappH500s FirmwareAll versions
NetappH700s FirmwareAll versions
NetappH410s FirmwareAll versions
NetappH410c FirmwareAll versions

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is 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.
How severe is CVE-2021-4197?
CVE-2021-4197 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.54% probability of exploitation in the next 30 days.
How do I fix CVE-2021-4197?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST