Go to homepageCyberStrike

Menu

Star on GitHub · 3.4k
Sign inDownload

CVE-2021-47132

7.5 · HIGH

In the Linux kernel, the following vulnerability has been resolved: mptcp: fix sk_forward_memory corruption on retransmission MPTCP sk_forward_memory handling is a bit special, as such field is p…

Published Mar 15, 2024CWE-787EPSS 0.48%

Overview

CVE-2021-47132 is a high-severity vulnerability. It was published on March 15, 2024 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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

mptcp: fix sk_forward_memory corruption on retransmission

MPTCP sk_forward_memory handling is a bit special, as such field

is protected by the msk socket spin_lock, instead of the plain

socket lock.

Currently we have a code path updating such field without handling

the relevant lock:

__mptcp_retrans() -> __mptcp_clean_una_wakeup()

Several helpers in __mptcp_clean_una_wakeup() will update

sk_forward_alloc, possibly causing such field corruption, as reported

by Matthieu.

Address the issue providing and using a new variant of blamed function

which explicitly acquires the msk spin lock.

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/b5941f066b4ca331db225a976dae1d6ca8cf0ae3Refgit.kernel.org/stable/c/b9c78b1a95966a7bd2ddae05b73eafc0cda4fba3Refgit.kernel.org/stable/c/b5941f066b4ca331db225a976dae1d6ca8cf0ae3Refgit.kernel.org/stable/c/b9c78b1a95966a7bd2ddae05b73eafc0cda4fba3

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47132?

CVE-2021-47132 is a high-severity vulnerability. It was published on March 15, 2024 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2021-47132?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-47132?

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-2021-47132?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47132 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.

Related HIGH CVEs from 2021

View all
Browse by year2026202520242023202220212020201920182017201620152014201320122011201020092008200720062005200420032002200120001999
LiveWatch live →