{"id":"UBUNTU-CVE-2023-4911","details":"A buffer overflow was discovered in the GNU C Library's dynamic loader ld.so while processing the GLIBC_TUNABLES environment variable. This issue could allow a local attacker to use maliciously crafted GLIBC_TUNABLES environment variables when launching binaries with SUID permission to execute code with elevated privileges.","modified":"2026-04-22T14:14:27.796303Z","published":"2023-10-03T17:00:00Z","related":["USN-6409-1"],"upstream":["CVE-2023-4911"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2023-4911"},{"type":"REPORT","url":"https://www.qualys.com/2023/10/03/cve-2023-4911/looney-tunables-local-privilege-escalation-glibc-ld-so.txt"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-6409-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2023-4911"},{"type":"REPORT","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog"}],"affected":[{"package":{"name":"glibc","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/glibc@2.35-0ubuntu3.4?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.35-0ubuntu3.4"}]}],"versions":["2.34-0ubuntu3","2.35-0ubuntu1","2.35-0ubuntu3","2.35-0ubuntu3.1","2.35-0ubuntu3.3"],"ecosystem_specific":{"priority_reason":"Local privilege escalation in a package that is installed on all Ubuntu instances.","availability":"No subscription required","binaries":[{"binary_name":"glibc-source","binary_version":"2.35-0ubuntu3.4"},{"binary_name":"libc-bin","binary_version":"2.35-0ubuntu3.4"},{"binary_name":"libc-dev-bin","binary_version":"2.35-0ubuntu3.4"},{"binary_name":"libc-devtools","binary_version":"2.35-0ubuntu3.4"},{"binary_name":"libc6","binary_version":"2.35-0ubuntu3.4"},{"binary_name":"libc6-amd64","binary_version":"2.35-0ubuntu3.4"},{"binary_name":"libc6-dev-amd64","binary_version":"2.35-0ubuntu3.4"},{"binary_name":"libc6-dev-i386","binary_version":"2.35-0ubuntu3.4"},{"binary_name":"libc6-dev-s390","binary_version":"2.35-0ubuntu3.4"},{"binary_name":"libc6-dev-x32","binary_version":"2.35-0ubuntu3.4"},{"binary_name":"libc6-i386","binary_version":"2.35-0ubuntu3.4"},{"binary_name":"libc6-prof","binary_version":"2.35-0ubuntu3.4"},{"binary_name":"libc6-s390","binary_version":"2.35-0ubuntu3.4"},{"binary_name":"libc6-x32","binary_version":"2.35-0ubuntu3.4"},{"binary_name":"locales","binary_version":"2.35-0ubuntu3.4"},{"binary_name":"locales-all","binary_version":"2.35-0ubuntu3.4"},{"binary_version":"2.35-0ubuntu3.4","binary_name":"nscd"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-4911.json"}},{"package":{"name":"glibc","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/glibc@2.38-1ubuntu6?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.38-1ubuntu6"}]}],"ecosystem_specific":{"binaries":[{"binary_name":"glibc-source","binary_version":"2.38-1ubuntu6"},{"binary_name":"libc-bin","binary_version":"2.38-1ubuntu6"},{"binary_name":"libc-dev-bin","binary_version":"2.38-1ubuntu6"},{"binary_name":"libc-devtools","binary_version":"2.38-1ubuntu6"},{"binary_name":"libc6","binary_version":"2.38-1ubuntu6"},{"binary_name":"libc6-amd64","binary_version":"2.38-1ubuntu6"},{"binary_name":"libc6-dev-amd64","binary_version":"2.38-1ubuntu6"},{"binary_name":"libc6-dev-i386","binary_version":"2.38-1ubuntu6"},{"binary_name":"libc6-dev-s390","binary_version":"2.38-1ubuntu6"},{"binary_version":"2.38-1ubuntu6","binary_name":"libc6-dev-x32"},{"binary_name":"libc6-i386","binary_version":"2.38-1ubuntu6"},{"binary_name":"libc6-prof","binary_version":"2.38-1ubuntu6"},{"binary_name":"libc6-s390","binary_version":"2.38-1ubuntu6"},{"binary_name":"libc6-x32","binary_version":"2.38-1ubuntu6"},{"binary_name":"locales","binary_version":"2.38-1ubuntu6"},{"binary_name":"locales-all","binary_version":"2.38-1ubuntu6"},{"binary_name":"nscd","binary_version":"2.38-1ubuntu6"}],"priority_reason":"Local privilege escalation in a package that is installed on all Ubuntu instances.","availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-4911.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},{"type":"Ubuntu","score":"high"}]}