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md: do overflow check for sb->bblog_shift in super_1_load()

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: md: do overflow check for sb->bblog_shift in super_1_load() In super_1_load(), sb->bblog_shift is an __u8 type value loaded from on- disk superblock. It is used for badblocks API badblocks_set() by the following sequence, 1930 rdev->badblocks.shift = sb->bblog_shift; 1931 for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) { 1932 u64 bb = le64_to_cpu(*bbp); 1933 int count = bb & (0x3ff); 1934 u64 sector = bb >> 10; 1935 sector <<= sb->bblog_shift; 1936 count <<= sb->bblog_shift; 1937 if (bb + 1 == 0) 1938 break; 1939 if (!badblocks_set(&rdev->badblocks, sector, count, 1)) 1940 return -EINVAL; 1941 } bb->bblog_shit is in range of 0-255, variable sector is 64bit width, for an invalid bb->bblog_shit, it is possible to make sector be overflowed by the following calculation, 1935 sector <<= sb->bblog_shift; Then in turn when call badblocks_set() at line 1939 with the invalid rdev->badblocks.shift set at line 1930, may result an overflow inside _badblocks_clear() in block/badblocks.c. Although there are many places to call badblocks APIs, the non-zero shift value is only used in super_1_load(), other places always use 0 as the shift value. Therefore it is unnecessary to do a general shift value overflow check inside badblock API, and just check here as the caller. This may avoid unnecessary check, make the badblocks API code more simple and elegant.

Announced Source revision 1
Original source ↗

CVE-2026-89557

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-89557

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "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"
  }
]
Related CVEs
CVE-2026-89557

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#35072 · Revision 1
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Publisher date
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