{"id":"CVE-2016-1575","url":"https://www.cyber-defence.io/tools/cve/CVE-2016-1575","generatedAt":"2026-10-27T17:58:18.149Z","title":"The overlayfs implementation in the Linux kernel through 4.5.2 does not properly maintain POSIX ACL xattr data, which allows local users to gain privileges by leveraging a group-writable setgid directory.","description":"The overlayfs implementation in the Linux kernel through 4.5.2 does not properly maintain POSIX ACL xattr data, which allows local users to gain privileges by leveraging a group-writable setgid directory.","published":"2016-05-02T10:59:23.000Z","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":["CWE-269"],"affected":["linux/linux kernel","canonical/ubuntu core","canonical/ubuntu linux","canonical/ubuntu touch"],"epss":{"score":0.00923,"percentile":0.60145,"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":41762,"kind":"exploit","title":"Ubuntu 14.04/15.10 - User Namespace Overlayfs Xattr SetGID Privilege Escalation","url":"https://www.exploit-db.com/exploits/41762","sourceUrl":"https://gitlab.com/exploit-database/exploitdb/-/blob/main/exploits/linux/local/41762.txt","file":"exploits/linux/local/41762.txt","published":"2016-11-22","added":"2017-03-29","updated":"2017-11-22","author":"halfdog","type":"local","platform":"linux","port":null,"verified":false,"codes":["CVE-2016-1575"],"tags":null,"aliases":null,"applicationUrl":null,"screenshotUrl":null,"referenceUrl":"http://www.halfdog.net/Security/2016/UserNamespaceOverlayfsXattrSetgidPrivilegeEscalation/"}]},"verdict":{"level":"urgent","text":"A public exploit is published in Exploit-DB and the impact is high, while EPSS rates exploitation at 0.9%. 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":["Patch","Vendor Advisory"],"source":"security@ubuntu.com"},{"url":"http://people.canonical.com/~ubuntu-security/cve/2016/CVE-2016-1575.html","tags":["Third Party Advisory"],"source":"security@ubuntu.com"},{"url":"http://www.halfdog.net/Security/2016/UserNamespaceOverlayfsXattrSetgidPrivilegeEscalation/","tags":["Exploit","Third Party Advisory"],"source":"security@ubuntu.com"},{"url":"http://www.openwall.com/lists/oss-security/2016/02/24/7","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://launchpad.net/bugs/1534961","tags":["Third Party Advisory"],"source":"security@ubuntu.com"},{"url":"http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=e9f57ebcba563e0cd532926cab83c92bb4d79360","tags":["Patch","Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://people.canonical.com/~ubuntu-security/cve/2016/CVE-2016-1575.html","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.halfdog.net/Security/2016/UserNamespaceOverlayfsXattrSetgidPrivilegeEscalation/","tags":["Exploit","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.openwall.com/lists/oss-security/2016/02/24/7","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://launchpad.net/bugs/1534961","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2016-1575","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."}