{"id":"CVE-2023-53474","summary":"x86/MCE/AMD: Use an u64 for bank_map","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nx86/MCE/AMD: Use an u64 for bank_map\n\nThee maximum number of MCA banks is 64 (MAX_NR_BANKS), see\n\n  a0bc32b3cacf (\"x86/mce: Increase maximum number of banks to 64\").\n\nHowever, the bank_map which contains a bitfield of which banks to\ninitialize is of type unsigned int and that overflows when those bit\nnumbers are \u003e= 32, leading to UBSAN complaining correctly:\n\n  UBSAN: shift-out-of-bounds in arch/x86/kernel/cpu/mce/amd.c:1365:38\n  shift exponent 32 is too large for 32-bit type 'int'\n\nChange the bank_map to a u64 and use the proper BIT_ULL() macro when\nmodifying bits in there.\n\n  [ bp: Rewrite commit message. ]","modified":"2026-03-20T12:33:10.898877Z","published":"2025-10-01T11:42:43.798Z","related":["SUSE-SU-2025:03615-1","SUSE-SU-2025:03628-1","SUSE-SU-2025:3716-1","SUSE-SU-2025:3761-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53474.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/11c58a0c1937c157dbdf82d5ab634d68c99f3098"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4c1cdec319b9aadb65737c3eb1f5cb74bd6aa156"},{"type":"WEB","url":"https://git.kernel.org/stable/c/67bb7521b6420d81dab7538c0686f18f7d6d09f4"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9669fa17287c3af2bbd4868d4c8fdd9e57f8332e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a9b9ea0e63a0ec5e97bf1219ab6dcbd55e362f83"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ba8ffb1251eb629c2ec35220e3896cf4f7b888a7"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53474.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-53474"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"a0bc32b3cacf194dc479b342f006203fd1e1941a"},{"fixed":"a9b9ea0e63a0ec5e97bf1219ab6dcbd55e362f83"},{"fixed":"11c58a0c1937c157dbdf82d5ab634d68c99f3098"},{"fixed":"ba8ffb1251eb629c2ec35220e3896cf4f7b888a7"},{"fixed":"9669fa17287c3af2bbd4868d4c8fdd9e57f8332e"},{"fixed":"67bb7521b6420d81dab7538c0686f18f7d6d09f4"},{"fixed":"4c1cdec319b9aadb65737c3eb1f5cb74bd6aa156"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2023-53474.json"}}],"schema_version":"1.7.5"}