{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "2699b67223aca6b1450fc2f72e40fada952afc85"
            },
            {
              "fixed": "94c820d99a4305d4ded41a97ed37ec7d26c56e7f"
            },
            {
              "fixed": "573fb68105fdc6a127ba6069e58a0d2aff3c9f93"
            },
            {
              "fixed": "323f3a056dbccb39a642ebde642044a680f3a6d6"
            },
            {
              "fixed": "0a03f9541c06fda64301dcf94f376f07ce2cc396"
            },
            {
              "fixed": "75d15738fd33a782606d0dc80cfeff47edf2ddd8"
            },
            {
              "fixed": "3b097416b4cff77285c1f472fc2c4058d8a7554f"
            },
            {
              "fixed": "df7d4d011d5ace20699ea948712f09f9ac08924f"
            },
            {
              "fixed": "35d522bd32462afcf1981dab6da8a9256c26c1e0"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.1.0"
            },
            {
              "fixed": "5.10.270"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.221"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.188"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.157"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.109"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.50"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89557.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmd: do overflow check for sb-\u003ebblog_shift in super_1_load()\n\nIn super_1_load(), sb-\u003ebblog_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-\u003ebadblocks.shift = sb-\u003ebblog_shift;\n 1931   for (i = 0 ; i \u003c (sectors \u003c\u003c (9-3)) ; i++, bbp++) {\n 1932           u64 bb = le64_to_cpu(*bbp);\n 1933           int count = bb \u0026 (0x3ff);\n 1934           u64 sector = bb \u003e\u003e 10;\n 1935           sector \u003c\u003c= sb-\u003ebblog_shift;\n 1936           count \u003c\u003c= sb-\u003ebblog_shift;\n 1937           if (bb + 1 == 0)\n 1938                   break;\n 1939           if (!badblocks_set(\u0026rdev-\u003ebadblocks, sector, count, 1))\n 1940                   return -EINVAL;\n 1941   }\n\nbb-\u003ebblog_shit is in range of 0-255, variable sector is 64bit width, for\nan invalid bb-\u003ebblog_shit, it is possible to make sector be overflowed\nby the following calculation,\n 1935           sector \u003c\u003c= sb-\u003ebblog_shift;\nThen in turn when call badblocks_set() at line 1939 with the invalid\nrdev-\u003ebadblocks.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",
  "modified": "2026-09-15T03:30:28.884183343Z",
  "published": "2026-09-11T19:44:29.857Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0a03f9541c06fda64301dcf94f376f07ce2cc396"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/323f3a056dbccb39a642ebde642044a680f3a6d6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/35d522bd32462afcf1981dab6da8a9256c26c1e0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3b097416b4cff77285c1f472fc2c4058d8a7554f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/573fb68105fdc6a127ba6069e58a0d2aff3c9f93"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/75d15738fd33a782606d0dc80cfeff47edf2ddd8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/94c820d99a4305d4ded41a97ed37ec7d26c56e7f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/df7d4d011d5ace20699ea948712f09f9ac08924f"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89557.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89557"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "md: do overflow check for sb-\u003ebblog_shift in super_1_load()"
}