CVE-2026-89557

{"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": "2026-10-19T08:48:50.070Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:48:50.070Z"}, "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."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - super_1_load() parses an MD v1 superblock and bad-block log from a local block device via md_import_device() (ADD_NEW_DISK ioctl, sysfs new_dev, udev/mdadm incremental, or boot autodetect), not a network protocol handler such as ksmbd, nfsd, or in-kernel TCP.\nAC:L - The attacker fully controls on-disk bblog_shift (an unchecked __u8, 0-255) and the bad-block log and can set a valid sb_csum; importing that RAID member deterministically overflows sector/count shifts and badblocks rounding with no race or attacker-uncontrollable layout.\nPR:L - md ioctls/sysfs require CAP_SYS_ADMIN, but an unprivileged local user can present a crafted RAID member (udisks loop-setup or equivalent); default udev mdadm --incremental then runs as root and the kernel parses the superblock, so init-namespace root is not required of the attacker.\nUI:N - The attacker attaches and triggers parse of their own crafted image (loop/udisks) themselves; automated udev/mdadm incremental assembly does not require a separate victim to open a file or confirm a prompt.\nS:U - Impact stays in the host kernel MD/badblocks code and that system's storage; this is ordinary same-host kernel memory corruption or denial of service, not a VM escape, IOMMU bypass, or other cross-authority boundary crossing.\nC:H - Overflowed bblog_shift poisons rdev->badblocks.shift and BB_MAKE() encodings in the kernel badblocks table; later badblocks_set/clear/check and raid1/raid10 I/O use those corrupted entries and over-wide shifts, which is kernel memory corruption that can be leveraged for information disclosure.\nI:H - The same overflow writes corrupted badblocks slots (BB_MAKE with wrapped start/len, including all-ones on zero length) and feeds raid1/raid10 narrow_write_error() a bogus 1<<shift block size, giving kernel-state corruption and mis-sized writes exploitable for integrity and control-flow impact.\nA:H - A crafted shift can divide-by-zero in rounddown/roundup, hit BUG() in front_clear(), hard-lock a CPU in _badblocks_set/_badblocks_clear while holding a seqlock with IRQs off, or oops on undefined over-wide shifts, fully denying availability."}]}], "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": "94c820d99a4305d4ded41a97ed37ec7d26c56e7f", "status": "affected", "versionType": "git"}, {"version": "2699b67223aca6b1450fc2f72e40fada952afc85", "lessThan": "573fb68105fdc6a127ba6069e58a0d2aff3c9f93", "status": "affected", "versionType": "git"}, {"version": "2699b67223aca6b1450fc2f72e40fada952afc85", "lessThan": "323f3a056dbccb39a642ebde642044a680f3a6d6", "status": "affected", "versionType": "git"}, {"version": "2699b67223aca6b1450fc2f72e40fada952afc85", "lessThan": "0a03f9541c06fda64301dcf94f376f07ce2cc396", "status": "affected", "versionType": "git"}, {"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": "5.10.270", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.221", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.188", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.157", "lessThanOrEqual": "6.6.*", "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", "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": "5.10.270"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.1", "versionEndExcluding": "5.15.221"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.1", "versionEndExcluding": "6.1.188"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.1", "versionEndExcluding": "6.6.157"}, {"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"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/94c820d99a4305d4ded41a97ed37ec7d26c56e7f"}, {"url": "https://git.kernel.org/stable/c/573fb68105fdc6a127ba6069e58a0d2aff3c9f93"}, {"url": "https://git.kernel.org/stable/c/323f3a056dbccb39a642ebde642044a680f3a6d6"}, {"url": "https://git.kernel.org/stable/c/0a03f9541c06fda64301dcf94f376f07ce2cc396"}, {"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"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-89557", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T19:24:07.440563Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:26:43.920Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-89557", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T19:24:07.440563Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:24:08.001Z"}}], "cna": {"title": "md: do overflow check for sb->bblog_shift in super_1_load()", "metrics": [{"cvssV3_1": {"version": "3.1", "baseScore": 7.8, "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}, "scenarios": [{"lang": "en", "value": "AV:L - super_1_load() parses an MD v1 superblock and bad-block log from a local block device via md_import_device() (ADD_NEW_DISK ioctl, sysfs new_dev, udev/mdadm incremental, or boot autodetect), not a network protocol handler such as ksmbd, nfsd, or in-kernel TCP.\nAC:L - The attacker fully controls on-disk bblog_shift (an unchecked __u8, 0-255) and the bad-block log and can set a valid sb_csum; importing that RAID member deterministically overflows sector/count shifts and badblocks rounding with no race or attacker-uncontrollable layout.\nPR:L - md ioctls/sysfs require CAP_SYS_ADMIN, but an unprivileged local user can present a crafted RAID member (udisks loop-setup or equivalent); default udev mdadm --incremental then runs as root and the kernel parses the superblock, so init-namespace root is not required of the attacker.\nUI:N - The attacker attaches and triggers parse of their own crafted image (loop/udisks) themselves; automated udev/mdadm incremental assembly does not require a separate victim to open a file or confirm a prompt.\nS:U - Impact stays in the host kernel MD/badblocks code and that system's storage; this is ordinary same-host kernel memory corruption or denial of service, not a VM escape, IOMMU bypass, or other cross-authority boundary crossing.\nC:H - Overflowed bblog_shift poisons rdev->badblocks.shift and BB_MAKE() encodings in the kernel badblocks table; later badblocks_set/clear/check and raid1/raid10 I/O use those corrupted entries and over-wide shifts, which is kernel memory corruption that can be leveraged for information disclosure.\nI:H - The same overflow writes corrupted badblocks slots (BB_MAKE with wrapped start/len, including all-ones on zero length) and feeds raid1/raid10 narrow_write_error() a bogus 1<<shift block size, giving kernel-state corruption and mis-sized writes exploitable for integrity and control-flow impact.\nA:H - A crafted shift can divide-by-zero in rounddown/roundup, hit BUG() in front_clear(), hard-lock a CPU in _badblocks_set/_badblocks_clear while holding a seqlock with IRQs off, or oops on undefined over-wide shifts, fully denying availability."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "2699b67223aca6b1450fc2f72e40fada952afc85", "lessThan": "94c820d99a4305d4ded41a97ed37ec7d26c56e7f", "versionType": "git"}, {"status": "affected", "version": "2699b67223aca6b1450fc2f72e40fada952afc85", "lessThan": "573fb68105fdc6a127ba6069e58a0d2aff3c9f93", "versionType": "git"}, {"status": "affected", "version": "2699b67223aca6b1450fc2f72e40fada952afc85", "lessThan": "323f3a056dbccb39a642ebde642044a680f3a6d6", "versionType": "git"}, {"status": "affected", "version": "2699b67223aca6b1450fc2f72e40fada952afc85", "lessThan": "0a03f9541c06fda64301dcf94f376f07ce2cc396", "versionType": "git"}, {"status": "affected", "version": "2699b67223aca6b1450fc2f72e40fada952afc85", "lessThan": "75d15738fd33a782606d0dc80cfeff47edf2ddd8", "versionType": "git"}, {"status": "affected", "version": "2699b67223aca6b1450fc2f72e40fada952afc85", "lessThan": "3b097416b4cff77285c1f472fc2c4058d8a7554f", "versionType": "git"}, {"status": "affected", "version": "2699b67223aca6b1450fc2f72e40fada952afc85", "lessThan": "df7d4d011d5ace20699ea948712f09f9ac08924f", "versionType": "git"}, {"status": "affected", "version": "2699b67223aca6b1450fc2f72e40fada952afc85", "lessThan": "35d522bd32462afcf1981dab6da8a9256c26c1e0", "versionType": "git"}], "programFiles": ["drivers/md/md.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "3.1"}, {"status": "unaffected", "version": "0", "lessThan": "3.1", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.270", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.221", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.188", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.157", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.109", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.50", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.2.4", "versionType": "semver", "lessThanOrEqual": "7.2.*"}, {"status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/md/md.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/94c820d99a4305d4ded41a97ed37ec7d26c56e7f"}, {"url": "https://git.kernel.org/stable/c/573fb68105fdc6a127ba6069e58a0d2aff3c9f93"}, {"url": "https://git.kernel.org/stable/c/323f3a056dbccb39a642ebde642044a680f3a6d6"}, {"url": "https://git.kernel.org/stable/c/0a03f9541c06fda64301dcf94f376f07ce2cc396"}, {"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"}], "x_generator": {"engine": "bippy-1.2.0"}, "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."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.270", "versionStartIncluding": "3.1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.221", "versionStartIncluding": "3.1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.188", "versionStartIncluding": "3.1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.157", "versionStartIncluding": "3.1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.109", "versionStartIncluding": "3.1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.50", "versionStartIncluding": "3.1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.2.4", "versionStartIncluding": "3.1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.3", "versionStartIncluding": "3.1"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:48:50.070Z"}}}, "cveMetadata": {"cveId": "CVE-2026-89557", "state": "PUBLISHED", "dateUpdated": "2026-10-19T08:48:50.070Z", "dateReserved": "2026-09-11T19:38:34.724Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-09-11T19:44:29.857Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"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": "94c820d99a4305d4ded41a97ed37ec7d26c56e7f", "status": "affected", "version": "2699b67223aca6b1450fc2f72e40fada952afc85", "versionType": "git"}, {"lessThan": "573fb68105fdc6a127ba6069e58a0d2aff3c9f93", "status": "affected", "version": "2699b67223aca6b1450fc2f72e40fada952afc85", "versionType": "git"}, {"lessThan": "323f3a056dbccb39a642ebde642044a680f3a6d6", "status": "affected", "version": "2699b67223aca6b1450fc2f72e40fada952afc85", "versionType": "git"}, {"lessThan": "0a03f9541c06fda64301dcf94f376f07ce2cc396", "status": "affected", "version": "2699b67223aca6b1450fc2f72e40fada952afc85", "versionType": "git"}, {"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": "5.10.*", "status": "unaffected", "version": "5.10.270", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.221", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.188", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.157", "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", "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": "2026-10-19T09:17:51.190", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-89557", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T19:24:07.440563Z", "version": "2.0.3"}}]}, "published": "2026-09-11T20:19:39.403", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0a03f9541c06fda64301dcf94f376f07ce2cc396"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/323f3a056dbccb39a642ebde642044a680f3a6d6"}, {"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/573fb68105fdc6a127ba6069e58a0d2aff3c9f93"}, {"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/94c820d99a4305d4ded41a97ed37ec7d26c56e7f"}, {"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"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[2699b67223aca6b1450fc2f72e40fada952afc85,75d15738fd33a782606d0fc80cfeff47edf2ddd8)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[2699b67223aca6b1450fc2f72e40fada952afc85,3b097416b4cff77285c1f472fc2c4058d8a7554f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[2699b67223aca6b1450fc2f72e40fada952afc85,df7d4d011d5ace20699ea948712f09f9ac08924f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[2699b67223aca6b1450fc2f72e40fada952afc85,35d522bd32462afcf1981dab6da8a9256c26c1e0)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "3.1"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,3.1)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.109,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.50,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.4,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-09-12T04:30:07.741611+00:00", "updated": "2026-09-15T22:00:17.639108+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}