{"id":"CVE-2026-97876","revision":null,"records":[{"revision":"b783506e762e47db9bdc3aa16be8557c","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-97876","aliases":[],"title":"Bypass of GRUB lockdown restriction in Secure Boot mode via serial command MMIO base address","description":"A local attacker with control over GRUB's configuration can bypass lockdown restrictions when booting with Secure Boot and load an unsigned GRUB module, while GRUB continues to report lockdown is enabled.\n\n\n\n\nThe vulnerability is caused by insufficient validation of the MMIO base address passed to the GRUB serial command. GRUB does not validate that the base address corresponds to a UART device, rather than being an arbitrary memory address. This allows an attacker to trick GRUB into writing non-arbitrary data at an attacker-controlled address, including resetting\u00A0the grub_file_verifiers list in a way that disables the subsequent verification of loaded modules.","state":0,"publishedAt":"2026-10-02T10:34:23.314+00:00","modifiedAt":"2026-10-02T17:45:06.705+00:00","affected":[{"ecosystem":"Vendor product","name":"grub2","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"GNU\",\n                    \"product\": \"grub2\",\n                    \"versions\": [\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"2.12\",\n                            \"lessThan\": \"2.16\",\n                            \"versionType\": \"semver\"\n                        }\n                    ],\n                    \"defaultStatus\": \"unaffected\"\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H","score":6.4,"severity":"MEDIUM"}],"references":["https://www.openwall.com/lists/oss-security/2026/09/13/5","https://gitlab.freedesktop.org/gnu-grub/grub/-/commit/26beaa3b2720fefdc4d04c1ae209b776fe6848d6"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-97876","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-97876","identifiers":["CVE-2026-97876"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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Not a global EPSS backfill.","generation":"2026-11-11T19:58:45.4661486+00:00","complete":true,"records":1097,"lastAttemptAt":"2026-11-11T19:58:45.4661486+00:00","lastSuccessAt":"2026-11-11T19:58:45.6274866+00:00","error":null,"lastVerifiedAt":"2026-11-11T19:58:45.6274869+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"nvd","scope":"Rolling NVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global NVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-0feae4fee9a0467f9dde710515b6c624","complete":false,"records":13753,"lastAttemptAt":"2026-11-11T19:59:11.1509472+00:00","lastSuccessAt":"2026-11-11T19:59:11.147+00:00","error":"100 identifier lookups failed; latest failures include request timeout. 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