{"id":"UBUNTU-CVE-2021-31871","details":"An issue was discovered in klibc before 2.0.9. An integer overflow in the cpio command may result in a NULL pointer dereference on 64-bit systems.","modified":"2026-04-22T12:53:59.647798Z","published":"2021-04-30T06:15:00Z","related":["USN-5379-1"],"upstream":["CVE-2021-31871"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-31871"},{"type":"REPORT","url":"https://kernel.org/pub/linux/libs/klibc/2.0/"},{"type":"REPORT","url":"https://lists.zytor.com/archives/klibc/2021-April/004593.html"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-5379-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2021-31871"}],"affected":[{"package":{"name":"klibc","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/klibc@2.0.3-0ubuntu1.14.04.3+esm2?arch=source&distro=trusty/esm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.0.3-0ubuntu1.14.04.3+esm2"}]}],"versions":["2.0.1-3.1ubuntu2","2.0.2-1ubuntu1","2.0.2-1ubuntu2","2.0.3-0ubuntu1","2.0.3-0ubuntu1.14.04.1","2.0.3-0ubuntu1.14.04.2","2.0.3-0ubuntu1.14.04.3"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro","binaries":[{"binary_name":"klibc-utils","binary_version":"2.0.3-0ubuntu1.14.04.3+esm2"},{"binary_name":"libklibc","binary_version":"2.0.3-0ubuntu1.14.04.3+esm2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-31871.json"}},{"package":{"name":"klibc","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/klibc@2.0.4-8ubuntu1.16.04.4+esm1?arch=source&distro=esm-infra/xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.0.4-8ubuntu1.16.04.4+esm1"}]}],"versions":["2.0.3-0ubuntu1","2.0.4-4","2.0.4-6","2.0.4-7","2.0.4-8","2.0.4-8ubuntu1","2.0.4-8ubuntu1.16.04.1","2.0.4-8ubuntu1.16.04.2","2.0.4-8ubuntu1.16.04.3","2.0.4-8ubuntu1.16.04.4"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro","binaries":[{"binary_name":"klibc-utils","binary_version":"2.0.4-8ubuntu1.16.04.4+esm1"},{"binary_name":"libklibc","binary_version":"2.0.4-8ubuntu1.16.04.4+esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-31871.json"}},{"package":{"name":"klibc","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/klibc@2.0.4-9ubuntu2.1?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.0.4-9ubuntu2.1"}]}],"versions":["2.0.4-9ubuntu1","2.0.4-9ubuntu2"],"ecosystem_specific":{"binaries":[{"binary_name":"klibc-utils","binary_version":"2.0.4-9ubuntu2.1"},{"binary_version":"2.0.4-9ubuntu2.1","binary_name":"libklibc"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-31871.json"}},{"package":{"name":"klibc","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/klibc@2.0.7-1ubuntu5.1?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.0.7-1ubuntu5.1"}]}],"versions":["2.0.6-1ubuntu1","2.0.6-1ubuntu2","2.0.7-1ubuntu1","2.0.7-1ubuntu3","2.0.7-1ubuntu4","2.0.7-1ubuntu5"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"klibc-utils","binary_version":"2.0.7-1ubuntu5.1"},{"binary_name":"libklibc","binary_version":"2.0.7-1ubuntu5.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-31871.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"low"}]}