{"id":"UBUNTU-CVE-2018-6551","details":"The malloc implementation in the GNU C Library (aka glibc or libc6), from version 2.24 to 2.26 on powerpc, and only in version 2.26 on i386, did not properly handle malloc calls with arguments close to SIZE_MAX and could return a pointer to a heap region that is smaller than requested, eventually leading to heap corruption.","modified":"2025-07-16T08:23:09.787266Z","published":"2018-02-02T14:29:00Z","withdrawn":"2025-07-18T16:44:30Z","upstream":["CVE-2018-6551"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2018-6551"},{"type":"REPORT","url":"https://sourceware.org/bugzilla/show_bug.cgi?id=22774"},{"type":"REPORT","url":"https://sourceware.org/git/?p=glibc.git;a=commit;h=8e448310d74b283c5cd02b9ed7fb997b47bf9b22"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2018-6551"}],"affected":[{"package":{"name":"glibc","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/glibc@2.27-3ubuntu1?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.27-3ubuntu1"}]}],"versions":["2.26-0ubuntu2","2.26-0ubuntu2.1","2.27-0ubuntu2","2.27-0ubuntu3"],"ecosystem_specific":{"binaries":[{"binary_name":"glibc-doc","binary_version":"2.27-3ubuntu1"},{"binary_name":"glibc-source","binary_version":"2.27-3ubuntu1"},{"binary_name":"libc-bin","binary_version":"2.27-3ubuntu1"},{"binary_name":"libc-bin-dbgsym","binary_version":"2.27-3ubuntu1"},{"binary_name":"libc-dev-bin","binary_version":"2.27-3ubuntu1"},{"binary_name":"libc-dev-bin-dbgsym","binary_version":"2.27-3ubuntu1"},{"binary_name":"libc6","binary_version":"2.27-3ubuntu1"},{"binary_name":"libc6-amd64","binary_version":"2.27-3ubuntu1"},{"binary_name":"libc6-amd64-dbgsym","binary_version":"2.27-3ubuntu1"},{"binary_name":"libc6-armel","binary_version":"2.27-3ubuntu1"},{"binary_name":"libc6-armel-dbgsym","binary_version":"2.27-3ubuntu1"},{"binary_name":"libc6-dbg","binary_version":"2.27-3ubuntu1"},{"binary_name":"libc6-dev","binary_version":"2.27-3ubuntu1"},{"binary_name":"libc6-dev-amd64","binary_version":"2.27-3ubuntu1"},{"binary_name":"libc6-dev-armel","binary_version":"2.27-3ubuntu1"},{"binary_name":"libc6-dev-i386","binary_version":"2.27-3ubuntu1"},{"binary_name":"libc6-dev-s390","binary_version":"2.27-3ubuntu1"},{"binary_name":"libc6-dev-x32","binary_version":"2.27-3ubuntu1"},{"binary_name":"libc6-i386","binary_version":"2.27-3ubuntu1"},{"binary_name":"libc6-i386-dbgsym","binary_version":"2.27-3ubuntu1"},{"binary_name":"libc6-pic","binary_version":"2.27-3ubuntu1"},{"binary_name":"libc6-s390","binary_version":"2.27-3ubuntu1"},{"binary_name":"libc6-s390-dbgsym","binary_version":"2.27-3ubuntu1"},{"binary_name":"libc6-udeb","binary_version":"2.27-3ubuntu1"},{"binary_name":"libc6-x32","binary_version":"2.27-3ubuntu1"},{"binary_name":"libc6-x32-dbgsym","binary_version":"2.27-3ubuntu1"},{"binary_name":"locales","binary_version":"2.27-3ubuntu1"},{"binary_name":"locales-all","binary_version":"2.27-3ubuntu1"},{"binary_name":"multiarch-support","binary_version":"2.27-3ubuntu1"},{"binary_name":"nscd","binary_version":"2.27-3ubuntu1"},{"binary_name":"nscd-dbgsym","binary_version":"2.27-3ubuntu1"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-6551.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},{"type":"Ubuntu","score":"medium"}]}