{"id":"CVE-2023-2640","state":"PUBLISHED","title":"On Ubuntu kernels carrying both c914c0e27eb0 and \"UBUNTU: SAUCE: overlayfs: Skip permission checking for trusted.overlayfs.* xattrs\", an unprivileged user may set privileged extend","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.","publishedAt":"2023-07-26T01:59:23.543Z","updatedAt":"2024-10-23T14:59:17.779Z","severity":{"score":7.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","source":"canonical"},"assigner":"canonical","products":["Canonical Ubuntu Kernel"],"affected":[{"vendor":"Canonical","product":"Ubuntu Kernel","packageName":"Linux","defaultStatus":"unaffected","versions":[{"version":"0","status":"unaffected","lessThan":"6.2.0-26.26","versionType":"semver"},{"version":"0","status":"unaffected","lessThan":"6.0.0-1020.20","versionType":"semver"},{"version":"0","status":"unaffected","lessThan":"5.4.0-155.172","versionType":"semver"}],"platforms":["Linux"]}],"references":["https://ubuntu.com/security/notices/USN-6250-1","https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-2640","https://wiz.io/blog/ubuntu-overlayfs-vulnerability","https://lists.ubuntu.com/archives/kernel-team/2023-July/140923.html"],"weaknesses":["CWE-863"],"ingestedAt":"2026-10-29T20:05:52.290Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2023/2xxx/CVE-2023-2640.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2023-2640","state":"PUBLISHED","datePublished":"2023-07-26T01:59:23.543Z","dateUpdated":"2024-10-23T14:59:17.779Z","assignerShortName":"canonical","assignerOrgId":"cc1ad9ee-3454-478d-9317-d3e869d708bc","dateReserved":"2023-05-10T21:23:35.226Z"},"containers":{"cna":{"descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"Canonical","product":"Ubuntu Kernel","packageName":"Linux","defaultStatus":"unaffected","versions":[{"version":"0","status":"unaffected","lessThan":"6.2.0-26.26","versionType":"semver"},{"version":"0","status":"unaffected","lessThan":"6.0.0-1020.20","versionType":"semver"},{"version":"0","status":"unaffected","lessThan":"5.4.0-155.172","versionType":"semver"}],"platforms":["Linux"]}],"references":[{"url":"https://ubuntu.com/security/notices/USN-6250-1","tags":["vendor-advisory"]},{"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-2640","tags":["issue-tracking"]},{"url":"https://wiz.io/blog/ubuntu-overlayfs-vulnerability","tags":["technical-description"]},{"url":"https://lists.ubuntu.com/archives/kernel-team/2023-July/140923.html","tags":["mailing-list"]}],"metrics":[{"format":"CVSS","cvssV3_1":{"version":"3.1","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-863","description":"CWE-863","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"canonical","orgId":"cc1ad9ee-3454-478d-9317-d3e869d708bc","dateUpdated":"2023-07-26T01:59:23.543Z"},"workarounds":[{"lang":"en","value":"If not needed, disable the ability for unprivileged users\nto create namespaces. To do this temporarily, do:\n  sudo sysctl -w kernel.unprivileged_userns_clone=0\nTo disable across reboots, do:\n  echo kernel.unprivileged_userns_clone=0 | \\\n  sudo tee /etc/sysctl.d/99-disable-unpriv-userns.conf"}],"datePublic":"2023-06-06T00:00:00.000Z","credits":[{"lang":"en","type":"finder","value":"Stonejiajia"},{"lang":"en","type":"finder","value":"Shir Tamari"},{"lang":"en","type":"finder","value":"Sagi Tzadik"}]},"adp":[{"title":"CVE Program Container","references":[{"url":"https://ubuntu.com/security/notices/USN-6250-1","tags":["vendor-advisory","x_transferred"]},{"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-2640","tags":["issue-tracking","x_transferred"]},{"url":"https://wiz.io/blog/ubuntu-overlayfs-vulnerability","tags":["technical-description","x_transferred"]},{"url":"https://lists.ubuntu.com/archives/kernel-team/2023-July/140923.html","tags":["mailing-list","x_transferred"]}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2024-08-02T06:26:09.894Z"}},{"title":"CISA ADP Vulnrichment","affected":[{"vendor":"canonical","product":"ubantu_kernel","defaultStatus":"unknown","versions":[{"version":"0","status":"affected","lessThan":"6.2.0-26.26","versionType":"semver"},{"version":"0","status":"affected","lessThan":"6.0.0-1020.20","versionType":"semver"},{"version":"0","status":"affected","lessThan":"5.4.0-155.172","versionType":"semver"}],"cpes":["cpe:2.3:o:canonical:ubantu_kernel:*:*:*:*:*:*:*:*"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2024-10-23T14:57:20.015297Z","id":"CVE-2023-2640","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2024-10-23T14:59:17.779Z"}}]}}}