{"id":"CVE-2023-40548","details":"A buffer overflow was found in Shim in the 32-bit system. The overflow happens due to an addition operation involving a user-controlled value parsed from the PE binary being used by Shim. This value is further used for memory allocation operations, leading to a heap-based buffer overflow. This flaw causes memory corruption and can lead to a crash or data integrity issues during the boot phase.","modified":"2026-04-10T05:00:52.660508Z","published":"2024-01-29T15:15:08.893Z","related":["ALSA-2024:1902","ALSA-2024:1903","SUSE-SU-2024:1368-1","SUSE-SU-2024:1461-1","SUSE-SU-2024:1462-1","SUSE-SU-2025:20136-1"],"references":[{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2024/05/msg00009.html"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2024:1876"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2024:1883"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2024:1902"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2024:1959"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2024:1903"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2024:2086"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2023-40548"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2024:1834"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2024:1835"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2024:1873"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2241782"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/rhboot/shim","events":[{"introduced":"0"},{"fixed":"5914984a1ffeab841f482c791426d7ca9935a5e6"},{"introduced":"0"},{"last_affected":"7e5c94dcf1693cec2a653a95e738333187170b33"}],"database_specific":{"versions":[{"introduced":"0"},{"fixed":"15.8"},{"introduced":"0"},{"last_affected":"15.8-rc1"}]}}],"versions":["0.3","0.4","0.5","0.7","0.8","0.9","11","12","13","14","15","15.2","15.3","15.4","15.5","15.5-rc2","15.6","15.6-rc2","15.7","15.8-rc1","shim-15.3-rc1","shim-15.3-rc2","shim-15.3-rc3","shim-15.3-rc4"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-40548.json","unresolved_ranges":[{"events":[{"introduced":"0"},{"last_affected":"39"}]}]}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"}]}