{"id":"USN-4915-1","summary":"linux-oem-5.6 vulnerabilities","details":"It was discovered that the overlayfs implementation in the Linux kernel did\nnot properly validate the application of file system capabilities with\nrespect to user namespaces. A local attacker could use this to gain\nelevated privileges. (CVE-2021-3493)\n\nVincent Dehors discovered that the shiftfs file system in the Ubuntu Linux\nkernel did not properly handle faults in copy_from_user() when passing\nthrough ioctls to an underlying file system. A local attacker could use\nthis to cause a denial of service (memory exhaustion) or execute arbitrary\ncode. (CVE-2021-3492)\n","modified":"2026-02-10T04:42:09Z","published":"2021-04-15T22:22:20Z","related":["UBUNTU-CVE-2021-3492","UBUNTU-CVE-2021-3493"],"upstream":["CVE-2021-3492","CVE-2021-3493","UBUNTU-CVE-2021-3492","UBUNTU-CVE-2021-3493"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-4915-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-3492"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-3493"}],"affected":[{"package":{"name":"linux-oem-5.6","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/linux-oem-5.6@5.6.0-1054.58?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.6.0-1054.58"}]}],"versions":["5.6.0-1007.7","5.6.0-1008.8","5.6.0-1010.10","5.6.0-1011.11","5.6.0-1013.13","5.6.0-1017.17","5.6.0-1018.18","5.6.0-1020.20","5.6.0-1021.21","5.6.0-1023.23","5.6.0-1026.26","5.6.0-1027.27","5.6.0-1028.28","5.6.0-1031.32","5.6.0-1032.33","5.6.0-1033.35","5.6.0-1034.36","5.6.0-1035.37","5.6.0-1036.39","5.6.0-1039.43","5.6.0-1042.46","5.6.0-1047.51","5.6.0-1048.52","5.6.0-1050.54","5.6.0-1052.56","5.6.0-1053.57"],"ecosystem_specific":{"binaries":[{"binary_name":"linux-buildinfo-5.6.0-1054-oem","binary_version":"5.6.0-1054.58"},{"binary_name":"linux-headers-5.6.0-1054-oem","binary_version":"5.6.0-1054.58"},{"binary_name":"linux-image-unsigned-5.6.0-1054-oem","binary_version":"5.6.0-1054.58"},{"binary_name":"linux-modules-5.6.0-1054-oem","binary_version":"5.6.0-1054.58"},{"binary_name":"linux-oem-5.6-headers-5.6.0-1054","binary_version":"5.6.0-1054.58"},{"binary_name":"linux-oem-5.6-tools-5.6.0-1054","binary_version":"5.6.0-1054.58"},{"binary_name":"linux-oem-5.6-tools-host","binary_version":"5.6.0-1054.58"},{"binary_name":"linux-tools-5.6.0-1054-oem","binary_version":"5.6.0-1054.58"}],"availability":"No subscription required"},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:20.04:LTS","cves":[{"severity":[{"score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"high","type":"Ubuntu"}],"id":"CVE-2021-3492"},{"severity":[{"score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"high","type":"Ubuntu"}],"id":"CVE-2021-3493"}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-4915-1.json"}}],"schema_version":"1.7.3"}