{"id":"CVE-2020-15706","details":"GRUB2 contains a race condition in grub_script_function_create() leading to a use-after-free vulnerability which can be triggered by redefining a function whilst the same function is already executing, leading to arbitrary code execution and secure boot restriction bypass. This issue affects GRUB2 version 2.04 and prior versions.","modified":"2026-03-15T22:34:17.963131Z","published":"2020-07-29T18:15:14.420Z","related":["MGASA-2021-0315","SUSE-SU-2020:14440-1","SUSE-SU-2020:2073-1","SUSE-SU-2020:2074-1","SUSE-SU-2020:2076-1","SUSE-SU-2020:2077-1","SUSE-SU-2020:2078-1","SUSE-SU-2020:2079-1","openSUSE-SU-2020:1168-1","openSUSE-SU-2020:1169-1","openSUSE-SU-2024:10824-1"],"references":[{"type":"ADVISORY","url":"http://ubuntu.com/security/notices/USN-4432-1"},{"type":"ADVISORY","url":"https://security.gentoo.org/glsa/202104-05"},{"type":"ADVISORY","url":"https://www.eclypsium.com/2020/07/29/theres-a-hole-in-the-boot/"},{"type":"ADVISORY","url":"https://www.openwall.com/lists/oss-security/2020/07/29/3"},{"type":"ADVISORY","url":"https://www.suse.com/support/kb/doc/?id=000019673"},{"type":"ADVISORY","url":"http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00016.html"},{"type":"ADVISORY","url":"https://access.redhat.com/security/vulnerabilities/grub2bootloader"},{"type":"ADVISORY","url":"https://security.netapp.com/advisory/ntap-20200731-0008/"},{"type":"ADVISORY","url":"https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/GRUB2SecureBootBypass"},{"type":"ADVISORY","url":"https://www.debian.org/security/2020-GRUB-UEFI-SecureBoot"},{"type":"ADVISORY","url":"https://www.debian.org/security/2020/dsa-4735"},{"type":"ADVISORY","url":"http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00017.html"},{"type":"ADVISORY","url":"http://www.openwall.com/lists/oss-security/2020/07/29/3"},{"type":"ADVISORY","url":"https://usn.ubuntu.com/4432-1/"},{"type":"ADVISORY","url":"https://www.suse.com/c/suse-addresses-grub2-secure-boot-issue/"},{"type":"REPORT","url":"https://lists.gnu.org/archive/html/grub-devel/2020-07/msg00034.html"},{"type":"FIX","url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/ADV200011"}],"affected":[{"database_specific":{"unresolved_ranges":[{"events":[{"introduced":"0"},{"last_affected":"2.04"}]},{"events":[{"introduced":"0"},{"last_affected":"4.0"}]},{"events":[{"introduced":"0"},{"last_affected":"14.04"}]},{"events":[{"introduced":"0"},{"last_affected":"16.04"}]},{"events":[{"introduced":"0"},{"last_affected":"18.04"}]},{"events":[{"introduced":"0"},{"last_affected":"20.04"}]},{"events":[{"introduced":"0"},{"last_affected":"10.0"}]},{"events":[{"introduced":"0"},{"last_affected":"7.0"}]},{"events":[{"introduced":"0"},{"last_affected":"8.0"}]},{"events":[{"introduced":"0"},{"last_affected":"11"}]},{"events":[{"introduced":"0"},{"last_affected":"12"}]},{"events":[{"introduced":"0"},{"last_affected":"15"}]},{"events":[{"introduced":"0"},{"last_affected":"1607"}]},{"events":[{"introduced":"0"},{"last_affected":"1709"}]},{"events":[{"introduced":"0"},{"last_affected":"1803"}]},{"events":[{"introduced":"0"},{"last_affected":"1809"}]},{"events":[{"introduced":"0"},{"last_affected":"1903"}]},{"events":[{"introduced":"0"},{"last_affected":"1909"}]},{"events":[{"introduced":"0"},{"last_affected":"2004"}]},{"events":[{"introduced":"0"},{"last_affected":"r2"}]},{"events":[{"introduced":"0"},{"last_affected":"1903"}]},{"events":[{"introduced":"0"},{"last_affected":"1909"}]},{"events":[{"introduced":"0"},{"last_affected":"2004"}]},{"events":[{"introduced":"0"},{"last_affected":"15.1"}]},{"events":[{"introduced":"0"},{"last_affected":"15.2"}]},{"events":[{"introduced":"0"},{"last_affected":"14.04"}]},{"events":[{"introduced":"0"},{"last_affected":"16.04"}]},{"events":[{"introduced":"0"},{"last_affected":"18.04"}]},{"events":[{"introduced":"0"},{"last_affected":"20.04"}]}],"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-15706.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H"}]}