{"id":"ALPINE-CVE-2021-3996","details":"A logic error was found in the libmount library of util-linux in the function that allows an unprivileged user to unmount a FUSE filesystem. This flaw allows a local user on a vulnerable system to unmount other users' filesystems that are either world-writable themselves (like /tmp) or mounted in a world-writable directory. An attacker may use this flaw to cause a denial of service to applications that use the affected filesystems.","modified":"2026-08-27T22:18:01.647849531Z","published":"2022-08-23T20:15:08.560Z","upstream":["CVE-2021-3996"],"references":[{"type":"ADVISORY","url":"https://security.alpinelinux.org/vuln/CVE-2021-3996"}],"affected":[{"package":{"name":"util-linux","ecosystem":"Alpine:v3.12","purl":"pkg:apk/alpine/util-linux?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.34"},{"fixed":"2.37.3-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-3996.json"}},{"package":{"name":"util-linux","ecosystem":"Alpine:v3.13","purl":"pkg:apk/alpine/util-linux?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.34"},{"fixed":"2.37.3-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-3996.json"}},{"package":{"name":"util-linux","ecosystem":"Alpine:v3.14","purl":"pkg:apk/alpine/util-linux?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.34"},{"fixed":"2.37.3-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-3996.json"}},{"package":{"name":"util-linux","ecosystem":"Alpine:v3.15","purl":"pkg:apk/alpine/util-linux?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.34"},{"fixed":"2.37.3-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-3996.json"}},{"package":{"name":"util-linux","ecosystem":"Alpine:v3.16","purl":"pkg:apk/alpine/util-linux?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.34"},{"fixed":"2.37.3-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-3996.json"}},{"package":{"name":"util-linux","ecosystem":"Alpine:v3.17","purl":"pkg:apk/alpine/util-linux?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.34"},{"fixed":"2.37.3-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-3996.json"}},{"package":{"name":"util-linux","ecosystem":"Alpine:v3.18","purl":"pkg:apk/alpine/util-linux?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.34"},{"fixed":"2.37.3-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-3996.json"}},{"package":{"name":"util-linux","ecosystem":"Alpine:v3.19","purl":"pkg:apk/alpine/util-linux?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.34"},{"fixed":"2.37.3-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-3996.json"}},{"package":{"name":"util-linux","ecosystem":"Alpine:v3.20","purl":"pkg:apk/alpine/util-linux?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.34"},{"fixed":"2.37.3-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-3996.json"}},{"package":{"name":"util-linux","ecosystem":"Alpine:v3.21","purl":"pkg:apk/alpine/util-linux?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.34"},{"fixed":"2.37.3-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-3996.json"}},{"package":{"name":"util-linux","ecosystem":"Alpine:v3.22","purl":"pkg:apk/alpine/util-linux?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.34"},{"fixed":"2.37.3-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-3996.json"}},{"package":{"name":"util-linux","ecosystem":"Alpine:v3.23","purl":"pkg:apk/alpine/util-linux?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.34"},{"fixed":"2.37.3-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-3996.json"}},{"package":{"name":"util-linux","ecosystem":"Alpine:v3.24","purl":"pkg:apk/alpine/util-linux?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.34"},{"fixed":"2.37.3-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-3996.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}