{"id":"USN-4968-2","summary":"lz4 vulnerability","details":"USN-4968-1 fixed a vulnerability in LZ4. This update provides\nthe corresponding update for Ubuntu 14.04 ESM and Ubuntu 16.04 ESM.\n\nOriginal advisory details:\n\n It was discovered that LZ4 incorrectly handled certain memory operations.\n If a user or automated system were tricked into uncompressing a specially-\n crafted LZ4 file, a remote attacker could use this issue to cause LZ4 to\n crash, resulting in a denial of service, or possibly execute arbitrary\n code.\n","modified":"2026-05-20T16:03:07.596775624Z","published":"2021-05-31T12:08:03Z","related":["UBUNTU-CVE-2021-3520"],"upstream":["CVE-2021-3520","UBUNTU-CVE-2021-3520"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-4968-2"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-3520"}],"affected":[{"package":{"name":"lz4","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/lz4?arch=source&distro=trusty%2Fesm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.0~r114-2ubuntu1+esm2"}]}],"versions":["0.0~r94-2","0.0~r99-1","0.0~r107-1","0.0~r109-1","0.0~r114-2ubuntu1","0.0~r114-2ubuntu1+esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"liblz4-1","binary_version":"0.0~r114-2ubuntu1+esm2"},{"binary_name":"liblz4-tool","binary_version":"0.0~r114-2ubuntu1+esm2"}],"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-4968-2.json","cves_map":{"ecosystem":"Ubuntu:Pro:14.04:LTS","cves":[{"severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2021-3520"}]}}},{"package":{"name":"lz4","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/lz4?arch=source&distro=esm-apps%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.0~r131-2ubuntu2+esm1"}]}],"versions":["0.0~r131-1","0.0~r131-2","0.0~r131-2ubuntu2"],"ecosystem_specific":{"binaries":[{"binary_name":"liblz4-tool","binary_version":"0.0~r131-2ubuntu2+esm1"},{"binary_name":"liblz4-1","binary_version":"0.0~r131-2ubuntu2+esm1"}],"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-4968-2.json","cves_map":{"ecosystem":"Ubuntu:Pro:16.04:LTS","cves":[]}}}],"schema_version":"1.7.5"}