{"id":"UBUNTU-CVE-2021-26910","details":"Firejail before 0.9.64.4 allows attackers to bypass intended access restrictions because there is a TOCTOU race condition between a stat operation and an OverlayFS mount operation.","modified":"2026-01-30T00:29:08.379723Z","published":"2021-02-08T20:15:00Z","related":["USN-5141-1"],"upstream":["CVE-2021-26910"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-26910"},{"type":"REPORT","url":"https://www.openwall.com/lists/oss-security/2021/02/08/5"},{"type":"REPORT","url":"https://unparalleled.eu/publications/2021/advisory-unpar-2021-0.txt"},{"type":"REPORT","url":"https://unparalleled.eu/blog/2021/20210208-rigged-race-against-firejail-for-local-root/"},{"type":"REPORT","url":"http://www.openwall.com/lists/oss-security/2021/02/09/1"},{"type":"REPORT","url":"https://github.com/netblue30/firejail/commit/97d8a03cad19501f017587cc4e47d8418273834b"},{"type":"REPORT","url":"https://github.com/netblue30/firejail/releases/tag/0.9.64.4"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-5141-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2021-26910"}],"affected":[{"package":{"name":"firejail","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/firejail@0.9.38.10-0ubuntu0.16.04.1?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.9.28-1","0.9.32-1","0.9.34-1","0.9.36-1","0.9.38-1","0.9.38-1ubuntu0.1","0.9.38.10-0ubuntu0.16.04.1"],"ecosystem_specific":{"binaries":[{"binary_name":"firejail","binary_version":"0.9.38.10-0ubuntu0.16.04.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-26910.json"}},{"package":{"name":"firejail","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/firejail@0.9.52-2?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.9.50-3","0.9.52-1","0.9.52-2"],"ecosystem_specific":{"binaries":[{"binary_name":"firejail","binary_version":"0.9.52-2"},{"binary_name":"firejail-profiles","binary_version":"0.9.52-2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-26910.json"}},{"package":{"name":"firejail","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/firejail@0.9.62-3ubuntu0.1?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.9.62-3ubuntu0.1"}]}],"versions":["0.9.60-2","0.9.62-1","0.9.62-2","0.9.62-3"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"firejail","binary_version":"0.9.62-3ubuntu0.1"},{"binary_name":"firejail-profiles","binary_version":"0.9.62-3ubuntu0.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-26910.json"}}],"schema_version":"1.7.3","severity":[{"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":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H"},{"type":"Ubuntu","score":"medium"}]}