CVE-2026-53130 (GCVE-0-2026-53130)

Vulnerability from cvelistv5 – Published: 2026-06-24 16:30 – Updated: 2026-06-24 16:30
VLAI
Title
fs/omfs: reject s_sys_blocksize smaller than OMFS_DIR_START
Summary
In the Linux kernel, the following vulnerability has been resolved: fs/omfs: reject s_sys_blocksize smaller than OMFS_DIR_START omfs_fill_super() rejects oversized s_sys_blocksize values (> PAGE_SIZE), but it does not reject values smaller than OMFS_DIR_START (0x1b8 = 440). Later, omfs_make_empty() uses sbi->s_sys_blocksize - OMFS_DIR_START as the length argument to memset(). Since s_sys_blocksize is u32, a crafted filesystem image with s_sys_blocksize < OMFS_DIR_START causes an unsigned underflow there, wrapping to a value near 2^32. That drives a ~4 GiB memset() from bh->b_data + OMFS_DIR_START and overwrites kernel memory far beyond the backing block buffer. Add the corresponding lower-bound check alongside the existing upper-bound check in omfs_fill_super(), so that malformed images are rejected during superblock validation before any filesystem data is processed.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: a3ab7155ea21aadc8a4d5687e91b3d876973185e , < fbc72f5c645155dc2ed3573243ed20f9913e3a54 (git)
Affected: a3ab7155ea21aadc8a4d5687e91b3d876973185e , < 5822a05a841a10794ad818620dd2af490b0705d3 (git)
Affected: a3ab7155ea21aadc8a4d5687e91b3d876973185e , < 754ff1bea3819a90c6f33cccfc1a299ef7609f07 (git)
Affected: a3ab7155ea21aadc8a4d5687e91b3d876973185e , < 131ea3e57fc22936ed0e2c8330f2e36106172f51 (git)
Affected: a3ab7155ea21aadc8a4d5687e91b3d876973185e , < 79f84af38c9fef9deb0e02c79eb969b5541c2644 (git)
Affected: a3ab7155ea21aadc8a4d5687e91b3d876973185e , < 6561afc38398e3518a29c5eebb975c30468f98a6 (git)
Affected: a3ab7155ea21aadc8a4d5687e91b3d876973185e , < 817f16ed62bc58a168417bfb5e859c2a370bab03 (git)
Affected: a3ab7155ea21aadc8a4d5687e91b3d876973185e , < 0621c385fda1376e967f37ccd534c26c3e511d14 (git)
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Linux Linux Affected: 2.6.27
Unaffected: 0 , < 2.6.27 (semver)
Unaffected: 5.10.258 , ≤ 5.10.* (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.141 , ≤ 6.6.* (semver)
Unaffected: 6.12.91 , ≤ 6.12.* (semver)
Unaffected: 6.18.33 , ≤ 6.18.* (semver)
Unaffected: 7.0.10 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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{
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      "cpeApplicability": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/omfs: reject s_sys_blocksize smaller than OMFS_DIR_START\n\nomfs_fill_super() rejects oversized s_sys_blocksize values (\u003e PAGE_SIZE),\nbut it does not reject values smaller than OMFS_DIR_START (0x1b8 = 440).\n\nLater, omfs_make_empty() uses\n\n    sbi-\u003es_sys_blocksize - OMFS_DIR_START\n\nas the length argument to memset().  Since s_sys_blocksize is u32,\na crafted filesystem image with s_sys_blocksize \u003c OMFS_DIR_START causes\nan unsigned underflow there, wrapping to a value near 2^32.  That drives\na ~4 GiB memset() from bh-\u003eb_data + OMFS_DIR_START and overwrites kernel\nmemory far beyond the backing block buffer.\n\nAdd the corresponding lower-bound check alongside the existing upper-bound\ncheck in omfs_fill_super(), so that malformed images are rejected during\nsuperblock validation before any filesystem data is processed."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-24T16:30:57.227Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/fbc72f5c645155dc2ed3573243ed20f9913e3a54"
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        {
          "url": "https://git.kernel.org/stable/c/0621c385fda1376e967f37ccd534c26c3e511d14"
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      ],
      "title": "fs/omfs: reject s_sys_blocksize smaller than OMFS_DIR_START",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53130",
    "datePublished": "2026-06-24T16:30:57.227Z",
    "dateReserved": "2026-06-09T07:44:35.386Z",
    "dateUpdated": "2026-06-24T16:30:57.227Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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