298 lines
17 KiB
JSON
298 lines
17 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-89557",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-09-11T19:38:34.724Z",
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"datePublished": "2026-09-11T19:44:29.857Z",
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"dateUpdated": "2026-10-19T08:48:50.070Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-10-19T08:48:50.070Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"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."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/md/md.c"
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],
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"versions": [
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{
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"version": "2699b67223aca6b1450fc2f72e40fada952afc85",
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"lessThan": "94c820d99a4305d4ded41a97ed37ec7d26c56e7f",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "2699b67223aca6b1450fc2f72e40fada952afc85",
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"lessThan": "573fb68105fdc6a127ba6069e58a0d2aff3c9f93",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "2699b67223aca6b1450fc2f72e40fada952afc85",
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"lessThan": "323f3a056dbccb39a642ebde642044a680f3a6d6",
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"status": "affected",
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},
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{
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"version": "2699b67223aca6b1450fc2f72e40fada952afc85",
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"lessThan": "0a03f9541c06fda64301dcf94f376f07ce2cc396",
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"status": "affected",
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},
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{
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"version": "2699b67223aca6b1450fc2f72e40fada952afc85",
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"lessThan": "75d15738fd33a782606d0dc80cfeff47edf2ddd8",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "2699b67223aca6b1450fc2f72e40fada952afc85",
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"lessThan": "3b097416b4cff77285c1f472fc2c4058d8a7554f",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "2699b67223aca6b1450fc2f72e40fada952afc85",
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"lessThan": "df7d4d011d5ace20699ea948712f09f9ac08924f",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "2699b67223aca6b1450fc2f72e40fada952afc85",
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"lessThan": "35d522bd32462afcf1981dab6da8a9256c26c1e0",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/md/md.c"
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],
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"versions": [
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{
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"version": "3.1",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "3.1",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.10.270",
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"lessThanOrEqual": "5.10.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.15.221",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.1.188",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.157",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.109",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.50",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2.4",
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"lessThanOrEqual": "7.2.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.3",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/94c820d99a4305d4ded41a97ed37ec7d26c56e7f"
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},
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{
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"url": "https://git.kernel.org/stable/c/573fb68105fdc6a127ba6069e58a0d2aff3c9f93"
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},
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{
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"url": "https://git.kernel.org/stable/c/323f3a056dbccb39a642ebde642044a680f3a6d6"
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},
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{
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"url": "https://git.kernel.org/stable/c/0a03f9541c06fda64301dcf94f376f07ce2cc396"
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},
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{
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"url": "https://git.kernel.org/stable/c/75d15738fd33a782606d0dc80cfeff47edf2ddd8"
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},
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{
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"url": "https://git.kernel.org/stable/c/3b097416b4cff77285c1f472fc2c4058d8a7554f"
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},
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{
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"url": "https://git.kernel.org/stable/c/df7d4d011d5ace20699ea948712f09f9ac08924f"
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},
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{
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"url": "https://git.kernel.org/stable/c/35d522bd32462afcf1981dab6da8a9256c26c1e0"
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}
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],
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"title": "md: do overflow check for sb->bblog_shift in super_1_load()",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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},
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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2026-89557",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "total"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-10-16T19:24:07.440563Z"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-10-16T19:26:43.920Z"
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}
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}
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]
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}
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} |