{"id":"UBUNTU-CVE-2018-3968","details":"An exploitable vulnerability exists in the verified boot protection of the Das U-Boot from version 2013.07-rc1 to 2014.07-rc2. The affected versions lack proper FIT signature enforcement, which allows an attacker to bypass U-Boot's verified boot and execute an unsigned kernel, embedded in a legacy image format. To trigger this vulnerability, a local attacker needs to be able to supply the image to boot.","modified":"2025-07-16T07:38:40.720304Z","published":"2019-03-21T17:29:00Z","withdrawn":"2025-07-18T16:44:25Z","upstream":["CVE-2018-3968"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2018-3968"},{"type":"REPORT","url":"https://talosintelligence.com/vulnerability_reports/TALOS-2018-0633"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2018-3968"}],"affected":[{"package":{"name":"u-boot","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/u-boot@2019.07+dfsg-1ubuntu4~18.04.1?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2019.07+dfsg-1ubuntu4~18.04.1"}]}],"versions":["2016.03+dfsg1-6ubuntu2","2018.07~rc3+dfsg1-0ubuntu1~18.04.1","2018.07~rc3+dfsg1-0ubuntu2~18.04.1","2018.07~rc3+dfsg1-0ubuntu3~18.04.1"],"ecosystem_specific":{"binaries":[{"binary_name":"u-boot","binary_version":"2019.07+dfsg-1ubuntu4~18.04.1"},{"binary_name":"u-boot-amlogic","binary_version":"2019.07+dfsg-1ubuntu4~18.04.1"},{"binary_name":"u-boot-exynos","binary_version":"2019.07+dfsg-1ubuntu4~18.04.1"},{"binary_name":"u-boot-imx","binary_version":"2019.07+dfsg-1ubuntu4~18.04.1"},{"binary_name":"u-boot-omap","binary_version":"2019.07+dfsg-1ubuntu4~18.04.1"},{"binary_name":"u-boot-qcom","binary_version":"2019.07+dfsg-1ubuntu4~18.04.1"},{"binary_name":"u-boot-rockchip","binary_version":"2019.07+dfsg-1ubuntu4~18.04.1"},{"binary_name":"u-boot-rpi","binary_version":"2019.07+dfsg-1ubuntu4~18.04.1"},{"binary_name":"u-boot-sunxi","binary_version":"2019.07+dfsg-1ubuntu4~18.04.1"},{"binary_name":"u-boot-tegra","binary_version":"2019.07+dfsg-1ubuntu4~18.04.1"},{"binary_name":"u-boot-tools","binary_version":"2019.07+dfsg-1ubuntu4~18.04.1"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-3968.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H"},{"type":"CVSS_V3","score":"CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H"},{"type":"CVSS_V3","score":"CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H"},{"type":"Ubuntu","score":"medium"}]}