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CVE-2021-4203

6.8 · MEDIUM

A use-after-free read flaw was found in sock_getsockopt() in net/core/sock.c due to SO_PEERCRED and SO_PEERGROUPS race with listen() (and connect()) in the Linux kernel.

Published Mar 25, 2022CWE-362EPSS 1.75%

Overview

CVE-2021-4203 is a medium-severity vulnerability. It was published on March 25, 2022 and has a CVSS 3.1 base score of 6.8 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.8, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

A use-after-free read flaw was found in sock_getsockopt() in net/core/sock.c due to SO_PEERCRED and SO_PEERGROUPS race with listen() (and connect()) in the Linux kernel. In this flaw, an attacker with a user privileges may crash the system or leak internal kernel information.

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

Refbugs.chromium.org/p/project-zero/issues/detail?id=2230&can=7&q=modified-after%3Atoday-30&sort=-modified&colspec=ID%20Type%20Status%20Priority%20Milestone%20Owner%20Summary%20Modified%20Cve&cells=tiles&redir=1Refbugzilla.redhat.com/show_bug.cgi?id=2036934Refgit.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=35306eb23814Reflore.kernel.org/netdev/20210929225750.2548112-1-eric.dumazet%40gmail.com/T/Refsecurity.netapp.com/advisory/ntap-20221111-0003/Refwww.oracle.com/security-alerts/cpujul2022.htmlRefbugs.chromium.org/p/project-zero/issues/detail?id=2230&can=7&q=modified-after%3Atoday-30&sort=-modified&colspec=ID%20Type%20Status%20Priority%20Milestone%20Owner%20Summary%20Modified%20Cve&cells=tiles&redir=1Refbugzilla.redhat.com/show_bug.cgi?id=2036934Refgit.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=35306eb23814Reflore.kernel.org/netdev/20210929225750.2548112-1-eric.dumazet%40gmail.com/T/

How CyberStrike helps

Frequently asked questions

What is CVE-2021-4203?

CVE-2021-4203 is a medium-severity vulnerability. It was published on March 25, 2022 and has a CVSS 3.1 base score of 6.8 (MEDIUM).

How severe is CVE-2021-4203?

This vulnerability has a CVSS 3.1 base score of 6.8, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-4203?

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-2021-4203?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-4203 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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