{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-89557", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.724Z", "datePublished": "2026-09-11T19:44:29.857Z", "dateUpdated": "2026-09-11T19:44:29.857Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-09-11T19:44:29.857Z"}, "descriptions": [{"lang": "en", "value": "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."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/md/md.c"], "versions": [{"version": "2699b67223aca6b1450fc2f72e40fada952afc85", "lessThan": "75d15738fd33a782606d0dc80cfeff47edf2ddd8", "status": "affected", "versionType": "git"}, {"version": "2699b67223aca6b1450fc2f72e40fada952afc85", "lessThan": "3b097416b4cff77285c1f472fc2c4058d8a7554f", "status": "affected", "versionType": "git"}, {"version": "2699b67223aca6b1450fc2f72e40fada952afc85", "lessThan": "df7d4d011d5ace20699ea948712f09f9ac08924f", "status": "affected", "versionType": "git"}, {"version": "2699b67223aca6b1450fc2f72e40fada952afc85", "lessThan": "35d522bd32462afcf1981dab6da8a9256c26c1e0", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/md/md.c"], "versions": [{"version": "3.1", "status": "affected"}, {"version": "0", "lessThan": "3.1", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.109", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.50", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.4", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3-rc1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.1", "versionEndExcluding": "6.12.109"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.1", "versionEndExcluding": "6.18.50"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.1", "versionEndExcluding": "7.2.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.1", "versionEndExcluding": "7.3-rc1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/75d15738fd33a782606d0dc80cfeff47edf2ddd8"}, {"url": "https://git.kernel.org/stable/c/3b097416b4cff77285c1f472fc2c4058d8a7554f"}, {"url": "https://git.kernel.org/stable/c/df7d4d011d5ace20699ea948712f09f9ac08924f"}, {"url": "https://git.kernel.org/stable/c/35d522bd32462afcf1981dab6da8a9256c26c1e0"}], "title": "md: do overflow check for sb->bblog_shift in super_1_load()", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/md/md.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "75d15738fd33a782606d0dc80cfeff47edf2ddd8", "status": "affected", "version": "2699b67223aca6b1450fc2f72e40fada952afc85", "versionType": "git"}, {"lessThan": "3b097416b4cff77285c1f472fc2c4058d8a7554f", "status": "affected", "version": "2699b67223aca6b1450fc2f72e40fada952afc85", "versionType": "git"}, {"lessThan": "df7d4d011d5ace20699ea948712f09f9ac08924f", "status": "affected", "version": "2699b67223aca6b1450fc2f72e40fada952afc85", "versionType": "git"}, {"lessThan": "35d522bd32462afcf1981dab6da8a9256c26c1e0", "status": "affected", "version": "2699b67223aca6b1450fc2f72e40fada952afc85", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/md/md.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "3.1"}, {"lessThan": "3.1", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.109", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.50", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3-rc1", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "id": "CVE-2026-89557", "lastModified": "2026-09-11T20:19:39.403", "metrics": {}, "published": "2026-09-11T20:19:39.403", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/35d522bd32462afcf1981dab6da8a9256c26c1e0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3b097416b4cff77285c1f472fc2c4058d8a7554f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/75d15738fd33a782606d0dc80cfeff47edf2ddd8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/df7d4d011d5ace20699ea948712f09f9ac08924f"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux kernel md driver: Denial of service via integer overflow in bad block handling", "id": "2532113", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2532113"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-190", "details": ["A flaw was found in the Linux kernel's Multiple Device (md) driver. A local attacker with control over a malicious disk image could provide a specially crafted on-disk superblock with an invalid 'bblog_shift' value. This invalid value can lead to an integer overflow when processing bad block information, potentially causing a system crash or data corruption, resulting in a denial of service."], "name": "CVE-2026-89557", "public_date": "2026-09-11T19:44:29Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-89557\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-89557\nhttps://git.kernel.org/stable/c/35d522bd32462afcf1981dab6da8a9256c26c1e0\nhttps://git.kernel.org/stable/c/3b097416b4cff77285c1f472fc2c4058d8a7554f\nhttps://git.kernel.org/stable/c/75d15738fd33a782606d0dc80cfeff47edf2ddd8\nhttps://git.kernel.org/stable/c/df7d4d011d5ace20699ea948712f09f9ac08924f"], "threat_severity": "Moderate"}

{}