{"id":"CVE-2026-89557","revision":"1d0869ca8d5e44a3ba8111faadaab955","records":[{"revision":"1d0869ca8d5e44a3ba8111faadaab955","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-89557","aliases":[],"title":"md: do overflow check for sb->bblog_shift in super_1_load()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nmd: do overflow check for sb->bblog_shift in super_1_load()\n\nIn super_1_load(), sb->bblog_shift is an __u8 type value loaded from on-\ndisk superblock. It is used for badblocks API badblocks_set() by the\nfollowing sequence,\n\n 1930   rdev->badblocks.shift = sb->bblog_shift;\n 1931   for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) {\n 1932           u64 bb = le64_to_cpu(*bbp);\n 1933           int count = bb & (0x3ff);\n 1934           u64 sector = bb >> 10;\n 1935           sector <<= sb->bblog_shift;\n 1936           count <<= sb->bblog_shift;\n 1937           if (bb + 1 == 0)\n 1938                   break;\n 1939           if (!badblocks_set(&rdev->badblocks, sector, count, 1))\n 1940                   return -EINVAL;\n 1941   }\n\nbb->bblog_shit is in range of 0-255, variable sector is 64bit width, for\nan invalid bb->bblog_shit, it is possible to make sector be overflowed\nby the following calculation,\n 1935           sector <<= sb->bblog_shift;\nThen in turn when call badblocks_set() at line 1939 with the invalid\nrdev->badblocks.shift set at line 1930, may result an overflow inside\n_badblocks_clear() in block/badblocks.c.\n\nAlthough there are many places to call badblocks APIs, the non-zero\nshift value is only used in super_1_load(), other places always use 0 as\nthe shift value. Therefore it is unnecessary to do a general shift value\noverflow check inside badblock API, and just check here as the caller.\n\nThis may avoid unnecessary check, make the badblocks API code more simple\nand elegant.","state":0,"publishedAt":"2026-09-11T19:44:29.857+00:00","modifiedAt":"2026-10-19T08:48:50.07+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/md/md.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"2699b67223aca6b1450fc2f72e40fada952afc85\",\n                            \"lessThan\": \"94c820d99a4305d4ded41a97ed37ec7d26c56e7f\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"2699b67223aca6b1450fc2f72e40fada952afc85\",\n                            \"lessThan\": \"573fb68105fdc6a127ba6069e58a0d2aff3c9f93\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"2699b67223aca6b1450fc2f72e40fada952afc85\",\n                            \"lessThan\": \"323f3a056dbccb39a642ebde642044a680f3a6d6\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"2699b67223aca6b1450fc2f72e40fada952afc85\",\n                            \"lessThan\": \"0a03f9541c06fda64301dcf94f376f07ce2cc396\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"2699b67223aca6b1450fc2f72e40fada952afc85\",\n                            \"lessThan\": \"75d15738fd33a782606d0dc80cfeff47edf2ddd8\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"2699b67223aca6b1450fc2f72e40fada952afc85\",\n                            \"lessThan\": \"3b097416b4cff77285c1f472fc2c4058d8a7554f\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"2699b67223aca6b1450fc2f72e40fada952afc85\",\n                            \"lessThan\": \"df7d4d011d5ace20699ea948712f09f9ac08924f\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"2699b67223aca6b1450fc2f72e40fada952afc85\",\n                            \"lessThan\": \"35d522bd32462afcf1981dab6da8a9256c26c1e0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/md/md.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"3.1\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"3.1\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.270\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.221\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.188\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.157\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.109\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.50\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.4\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/94c820d99a4305d4ded41a97ed37ec7d26c56e7f","https://git.kernel.org/stable/c/573fb68105fdc6a127ba6069e58a0d2aff3c9f93","https://git.kernel.org/stable/c/323f3a056dbccb39a642ebde642044a680f3a6d6","https://git.kernel.org/stable/c/0a03f9541c06fda64301dcf94f376f07ce2cc396","https://git.kernel.org/stable/c/75d15738fd33a782606d0dc80cfeff47edf2ddd8","https://git.kernel.org/stable/c/3b097416b4cff77285c1f472fc2c4058d8a7554f","https://git.kernel.org/stable/c/df7d4d011d5ace20699ea948712f09f9ac08924f","https://git.kernel.org/stable/c/35d522bd32462afcf1981dab6da8a9256c26c1e0"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89557","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-89557","identifiers":["CVE-2026-89557"]},"retained":false,"historicalAffected":[]}],"coverage":[]}