What is CVE-2021-47010?

CVE-2021-47010 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10, classified as a Uncontrolled Resource Consumption flaw (CWE-400). CVE-2021-47010 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-47010?

CVE-2021-47010 has a CVSS score of 7.8 out of 10, rated High severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Is there a patch available for CVE-2021-47010?

No patch is currently available for CVE-2021-47010. Monitor the NIST NVD and your Linux distribution's security advisories for updates.

Is CVE-2021-47010 actively exploited?

CVE-2021-47010 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Uncontrolled Resource Consumption (CWE-400)?

The product does not properly control the amount of resources it consumes, leading to exhaustion. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/400.html

CVE-2021-47010

High

In the Linux kernel, the following vulnerability has been resolved: net: Only allow init netns to set default tcp cong to a restricted algo tcp_set_default_congestion_control() is netns-safe in that it writes to &net->ipv4.tcp_congestion_control, but it also sets ca->flags |= TCP_CONG_NON_RESTRICTED which is not namespaced. This has the unintended side-effect of changing the global net.ipv4.tcp_allowed_congestion_control sysctl, despite the fact that it is read-only: 97684f0970f6 ("net: Make tcp_allowed_congestion_control readonly in non-init netns") Resolve this netns "leak" by only allowing the init netns to set the default algorithm to one that is restricted. This restriction could be removed if tcp_allowed_congestion_control were namespace-ified in the future. This bug was uncovered with https://github.com/JonathonReinhart/linux-netns-sysctl-verify

Package Linux Kernel

Published 2024-02-28

Last modified 2025-03-19

CVSS version 3.1

Patch available

Awaiting data

CVSS 3.1 score

7.8

out of 10

High

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Vector string

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

Weakness type

CWE-400

CVE-2021-47010 is a Uncontrolled Resource Consumption vulnerability

What is Uncontrolled Resource Consumption?

The product does not properly control the amount of resources it consumes, leading to exhaustion. Learn more on MITRE CWE

References

The following references provide additional information about CVE-2021-47010 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Kernel patch commit
https://git.kernel.org/stable/c/6c1ea8bee75df8fe2184a50fcd0f70bf82986f42
Patch
Kernel patch commit
https://git.kernel.org/stable/c/8d432592f30fcc34ef5a10aac4887b4897884493
Patch
Kernel patch commit
https://git.kernel.org/stable/c/9884f745108f7d25b189bbcd6754e284fb29ab68
Patch

6 patch commits total View all on NVD

Details

CVE ID CVE-2021-47010

Severity High

CVSS score 7.8 / 10

CVSS version 3.1

Published 2024-02-28

Modified 2025-03-19

KEV No

Patch Awaiting data

Package linux

Frequently asked questions

What is CVE-2021-47010?

CVE-2021-47010 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10 , classified as an Uncontrolled Resource Consumption flaw (CWE-400) . CVE-2021-47010 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-47010?

CVE-2021-47010 has a CVSS score of 7.8 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Is there a patch available for CVE-2021-47010?

No patch is currently available for CVE-2021-47010. Monitor the NIST NVD and your Linux distribution's security advisories for updates.
Is CVE-2021-47010 actively exploited?

No — CVE-2021-47010 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.
What is Uncontrolled Resource Consumption (CWE-400)?

The product does not properly control the amount of resources it consumes, leading to exhaustion. View CWE-400 on MITRE CWE →