{"id":"UBUNTU-CVE-2019-19126","details":"On the x86-64 architecture, the GNU C Library (aka glibc) before 2.31 fails to ignore the LD_PREFER_MAP_32BIT_EXEC environment variable during program execution after a security transition, allowing local attackers to restrict the possible mapping addresses for loaded libraries and thus bypass ASLR for a setuid program.","modified":"2026-04-22T13:39:42.928043Z","published":"2019-11-19T22:15:00Z","related":["USN-4416-1"],"upstream":["CVE-2019-19126"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2019-19126"},{"type":"REPORT","url":"https://sourceware.org/ml/libc-alpha/2019-11/msg00649.html"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-4416-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2019-19126"}],"affected":[{"package":{"name":"glibc","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/glibc@2.23-0ubuntu11.2?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.23-0ubuntu11.2"}]}],"versions":["2.21-0ubuntu4","2.21-0ubuntu5","2.21-0ubuntu6","2.23-0ubuntu1","2.23-0ubuntu2","2.23-0ubuntu3","2.23-0ubuntu4","2.23-0ubuntu5","2.23-0ubuntu6","2.23-0ubuntu7","2.23-0ubuntu9","2.23-0ubuntu10","2.23-0ubuntu11"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"glibc-source","binary_version":"2.23-0ubuntu11.2"},{"binary_name":"libc-bin","binary_version":"2.23-0ubuntu11.2"},{"binary_name":"libc-dev-bin","binary_version":"2.23-0ubuntu11.2"},{"binary_name":"libc6","binary_version":"2.23-0ubuntu11.2"},{"binary_name":"libc6-amd64","binary_version":"2.23-0ubuntu11.2"},{"binary_name":"libc6-armel","binary_version":"2.23-0ubuntu11.2"},{"binary_name":"libc6-dev-amd64","binary_version":"2.23-0ubuntu11.2"},{"binary_name":"libc6-dev-armel","binary_version":"2.23-0ubuntu11.2"},{"binary_name":"libc6-dev-i386","binary_version":"2.23-0ubuntu11.2"},{"binary_name":"libc6-dev-ppc64","binary_version":"2.23-0ubuntu11.2"},{"binary_name":"libc6-dev-s390","binary_version":"2.23-0ubuntu11.2"},{"binary_name":"libc6-dev-x32","binary_version":"2.23-0ubuntu11.2"},{"binary_name":"libc6-i386","binary_version":"2.23-0ubuntu11.2"},{"binary_version":"2.23-0ubuntu11.2","binary_name":"libc6-pic"},{"binary_name":"libc6-ppc64","binary_version":"2.23-0ubuntu11.2"},{"binary_name":"libc6-s390","binary_version":"2.23-0ubuntu11.2"},{"binary_name":"libc6-x32","binary_version":"2.23-0ubuntu11.2"},{"binary_name":"locales","binary_version":"2.23-0ubuntu11.2"},{"binary_name":"locales-all","binary_version":"2.23-0ubuntu11.2"},{"binary_name":"multiarch-support","binary_version":"2.23-0ubuntu11.2"},{"binary_name":"nscd","binary_version":"2.23-0ubuntu11.2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2019/UBUNTU-CVE-2019-19126.json"}},{"package":{"name":"glibc","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/glibc@2.27-3ubuntu1.2?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.27-3ubuntu1.2"}]}],"versions":["2.26-0ubuntu2","2.26-0ubuntu2.1","2.27-0ubuntu2","2.27-0ubuntu3","2.27-3ubuntu1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"2.27-3ubuntu1.2","binary_name":"glibc-source"},{"binary_version":"2.27-3ubuntu1.2","binary_name":"libc-bin"},{"binary_name":"libc-dev-bin","binary_version":"2.27-3ubuntu1.2"},{"binary_name":"libc6","binary_version":"2.27-3ubuntu1.2"},{"binary_name":"libc6-amd64","binary_version":"2.27-3ubuntu1.2"},{"binary_name":"libc6-armel","binary_version":"2.27-3ubuntu1.2"},{"binary_version":"2.27-3ubuntu1.2","binary_name":"libc6-dev-amd64"},{"binary_name":"libc6-dev-armel","binary_version":"2.27-3ubuntu1.2"},{"binary_name":"libc6-dev-i386","binary_version":"2.27-3ubuntu1.2"},{"binary_name":"libc6-dev-s390","binary_version":"2.27-3ubuntu1.2"},{"binary_name":"libc6-dev-x32","binary_version":"2.27-3ubuntu1.2"},{"binary_name":"libc6-i386","binary_version":"2.27-3ubuntu1.2"},{"binary_name":"libc6-pic","binary_version":"2.27-3ubuntu1.2"},{"binary_name":"libc6-s390","binary_version":"2.27-3ubuntu1.2"},{"binary_name":"libc6-x32","binary_version":"2.27-3ubuntu1.2"},{"binary_name":"locales","binary_version":"2.27-3ubuntu1.2"},{"binary_name":"locales-all","binary_version":"2.27-3ubuntu1.2"},{"binary_name":"multiarch-support","binary_version":"2.27-3ubuntu1.2"},{"binary_name":"nscd","binary_version":"2.27-3ubuntu1.2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2019/UBUNTU-CVE-2019-19126.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:L/I:N/A:N"},{"type":"Ubuntu","score":"low"}]}