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CVE-2021-47152

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: mptcp: fix data stream corruption Maxim reported several issues when forcing a TCP transparent proxy to use the MPTCP protocol…

Published Mar 25, 2024CWE-787EPSS 0.24%

Overview

CVE-2021-47152 is a high-severity vulnerability. It was published on March 25, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

mptcp: fix data stream corruption

Maxim reported several issues when forcing a TCP transparent proxy

to use the MPTCP protocol for the inbound connections. He also

provided a clean reproducer.

The problem boils down to 'mptcp_frag_can_collapse_to()' assuming

that only MPTCP will use the given page_frag.

If others - e.g. the plain TCP protocol - allocate page fragments,

we can end-up re-using already allocated memory for mptcp_data_frag.

Fix the issue ensuring that the to-be-expanded data fragment is

located at the current page frag end.

v1 -> v2:

- added missing fixes tag (Mat)

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/18e7f0580da15cac1e79d73683ada5a9e70980f8Refgit.kernel.org/stable/c/29249eac5225429b898f278230a6ca2baa1ae154Refgit.kernel.org/stable/c/3267a061096efc91eda52c2a0c61ba76e46e4b34Refgit.kernel.org/stable/c/18e7f0580da15cac1e79d73683ada5a9e70980f8Refgit.kernel.org/stable/c/29249eac5225429b898f278230a6ca2baa1ae154Refgit.kernel.org/stable/c/3267a061096efc91eda52c2a0c61ba76e46e4b34

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47152?

CVE-2021-47152 is a high-severity vulnerability. It was published on March 25, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2021-47152?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-47152?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-47152?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47152 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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