Advisory Published

USN-5064-1: GNU cpio vulnerability

First published: Wed Sep 08 2021(Updated: )

Maverick Chung and Qiaoyi Fang discovered that cpio incorrectly handled certain pattern files. A remote attacker could use this issue to cause cpio to crash, resulting in a denial of service, or possibly execute arbitrary code.

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/cpio<2.13+dfsg-4ubuntu0.3
2.13+dfsg-4ubuntu0.3
=21.04
All of
ubuntu/cpio<2.13+dfsg-2ubuntu0.3
2.13+dfsg-2ubuntu0.3
=20.04
All of
ubuntu/cpio<2.12+dfsg-6ubuntu0.18.04.4
2.12+dfsg-6ubuntu0.18.04.4
=18.04

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Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the vulnerability ID for this issue?

    The vulnerability ID for this issue is CVE-2021-38185.

  • What is the severity level of CVE-2021-38185?

    The severity level of CVE-2021-38185 is not mentioned in the provided information.

  • What is the affected software?

    The affected software is cpio version 2.13+dfsg-4ubuntu0.3, 2.13+dfsg-2ubuntu0.3, and 2.12+dfsg-6ubuntu0.18.04.4 on Ubuntu 21.04, 20.04, and 18.04, respectively.

  • How can a remote attacker exploit CVE-2021-38185?

    A remote attacker can exploit CVE-2021-38185 by using certain pattern files to cause cpio to crash, resulting in a denial of service or possibly execute arbitrary code.

  • How can I fix CVE-2021-38185?

    To fix CVE-2021-38185, you should update cpio to the specified fixed versions: 2.13+dfsg-4ubuntu0.3 for Ubuntu 21.04, 2.13+dfsg-2ubuntu0.3 for Ubuntu 20.04, and 2.12+dfsg-6ubuntu0.18.04.4 for Ubuntu 18.04.

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