{"id":"CVE-2016-1576","url":"https://www.cyber-defence.io/tools/cve/CVE-2016-1576","generatedAt":"2026-10-27T17:56:33.023Z","title":"The overlayfs implementation in the Linux kernel through 4.5.2 does not properly restrict the mount namespace, which allows local users to gain privileges by mounting an overlayfs filesystem on top of a FUSE filesystem, and then executing a crafted…","description":"The overlayfs implementation in the Linux kernel through 4.5.2 does not properly restrict the mount namespace, which allows local users to gain privileges by mounting an overlayfs filesystem on top of a FUSE filesystem, and then executing a crafted setuid program.","published":"2016-05-02T10:59:24.000Z","lastModified":"2026-06-17T00:42:12.000Z","status":"Modified","sourceIdentifier":"security@ubuntu.com","cvss":{"version":"3.1","score":7.8,"severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},"cwe":[],"affected":["canonical/ubuntu core","canonical/ubuntu linux","canonical/ubuntu touch","linux/linux kernel"],"epss":{"score":0.01129,"percentile":0.66157,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":1,"verified":false,"firstPublished":"2016-11-22","source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[{"edbId":41763,"kind":"exploit","title":"Ubuntu 15.10 - 'USERNS ' Overlayfs Over Fuse Privilege Escalation","url":"https://www.exploit-db.com/exploits/41763","sourceUrl":"https://gitlab.com/exploit-database/exploitdb/-/blob/main/exploits/linux/local/41763.txt","file":"exploits/linux/local/41763.txt","published":"2016-11-22","added":"2017-03-29","updated":"2017-03-30","author":"halfdog","type":"local","platform":"linux","port":null,"verified":false,"codes":["CVE-2016-1576"],"tags":null,"aliases":null,"applicationUrl":null,"screenshotUrl":null,"referenceUrl":"http://www.halfdog.net/Security/2016/OverlayfsOverFusePrivilegeEscalation/"}]},"verdict":{"level":"urgent","text":"A public exploit is published in Exploit-DB and the impact is high, while EPSS rates exploitation at 1.1%. Anyone can run this; patch or mitigate before the next change window and check exposed instances for signs of use."},"changes":[],"references":[{"url":"http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=e9f57ebcba563e0cd532926cab83c92bb4d79360","tags":["Mailing List","Patch","Vendor Advisory"],"source":"security@ubuntu.com"},{"url":"http://people.canonical.com/~ubuntu-security/cve/2016/CVE-2016-1576.html","tags":["Third Party Advisory"],"source":"security@ubuntu.com"},{"url":"http://www.halfdog.net/Security/2016/OverlayfsOverFusePrivilegeEscalation/","tags":["Exploit","Third Party Advisory"],"source":"security@ubuntu.com"},{"url":"http://www.openwall.com/lists/oss-security/2016/02/24/8","tags":["Mailing List","Third Party Advisory"],"source":"security@ubuntu.com"},{"url":"http://www.openwall.com/lists/oss-security/2021/10/18/1","tags":["Mailing List","Third Party Advisory"],"source":"security@ubuntu.com"},{"url":"https://bugs.launchpad.net/bugs/1535150","tags":["Third Party Advisory"],"source":"security@ubuntu.com"},{"url":"https://launchpadlibrarian.net/235300093/0005-overlayfs-Be-more-careful-about-copying-up-sxid-file.patch","tags":["Mailing List","Patch","Third Party Advisory"],"source":"security@ubuntu.com"},{"url":"https://launchpadlibrarian.net/235300225/0006-overlayfs-Propogate-nosuid-from-lower-and-upper-moun.patch","tags":["Mailing List","Patch","Third Party Advisory"],"source":"security@ubuntu.com"},{"url":"http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=e9f57ebcba563e0cd532926cab83c92bb4d79360","tags":["Mailing List","Patch","Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://people.canonical.com/~ubuntu-security/cve/2016/CVE-2016-1576.html","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.halfdog.net/Security/2016/OverlayfsOverFusePrivilegeEscalation/","tags":["Exploit","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.openwall.com/lists/oss-security/2016/02/24/8","tags":["Mailing List","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.openwall.com/lists/oss-security/2021/10/18/1","tags":["Mailing List","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://bugs.launchpad.net/bugs/1535150","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://launchpadlibrarian.net/235300093/0005-overlayfs-Be-more-careful-about-copying-up-sxid-file.patch","tags":["Mailing List","Patch","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://launchpadlibrarian.net/235300225/0006-overlayfs-Propogate-nosuid-from-lower-and-upper-moun.patch","tags":["Mailing List","Patch","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2016-1576","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}