{"id":"CVE-2023-2640","url":"https://www.cyber-defence.io/tools/cve/CVE-2023-2640","generatedAt":"2026-10-24T18:00:06.070Z","title":"On Ubuntu kernels carrying both c914c0e27eb0 and \"UBUNTU: SAUCE: overlayfs: Skip permission checking for trusted.overlayfs.* xattrs\", an unprivileged user may set privileged extended attributes on the mounted files, leading them to be set on the upper…","description":"On Ubuntu kernels carrying both c914c0e27eb0 and \"UBUNTU: SAUCE: overlayfs: Skip permission checking for trusted.overlayfs.* xattrs\", an unprivileged user may set privileged extended attributes on the mounted files, leading them to be set on the upper files without the appropriate security checks.","published":"2023-07-26T02:15:09.000Z","lastModified":"2026-06-17T05:53:05.000Z","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-863"],"affected":["canonical/ubuntu linux"],"epss":{"score":0.15199,"percentile":0.96752,"date":"2026-10-23","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"urgent","text":"EPSS puts the probability of exploitation in the next 30 days at 15.2%, higher than 97% of all known CVEs. Patch or mitigate before the next change window."},"changes":[],"references":[{"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-2640","tags":["Third Party Advisory"],"source":"security@ubuntu.com"},{"url":"https://lists.ubuntu.com/archives/kernel-team/2023-July/140923.html","tags":["Mailing List","Patch"],"source":"security@ubuntu.com"},{"url":"https://ubuntu.com/security/notices/USN-6250-1","tags":["Vendor Advisory"],"source":"security@ubuntu.com"},{"url":"https://wiz.io/blog/ubuntu-overlayfs-vulnerability","tags":["Exploit","Mitigation","Third Party Advisory"],"source":"security@ubuntu.com"},{"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-2640","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.ubuntu.com/archives/kernel-team/2023-July/140923.html","tags":["Mailing List","Patch"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://ubuntu.com/security/notices/USN-6250-1","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://wiz.io/blog/ubuntu-overlayfs-vulnerability","tags":["Exploit","Mitigation","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2023-2640","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."}