CVE-2022-49769 (GCVE-0-2022-49769)

Vulnerability from cvelistv5 – Published: 2025-05-01 14:09 – Updated: 2025-12-23 13:25
VLAI?
Title
gfs2: Check sb_bsize_shift after reading superblock
Summary
In the Linux kernel, the following vulnerability has been resolved: gfs2: Check sb_bsize_shift after reading superblock Fuzzers like to scribble over sb_bsize_shift but in reality it's very unlikely that this field would be corrupted on its own. Nevertheless it should be checked to avoid the possibility of messy mount errors due to bad calculations. It's always a fixed value based on the block size so we can just check that it's the expected value. Tested with: mkfs.gfs2 -O -p lock_nolock /dev/vdb for i in 0 -1 64 65 32 33; do gfs2_edit -p sb field sb_bsize_shift $i /dev/vdb mount /dev/vdb /mnt/test && umount /mnt/test done Before this patch we get a withdraw after [ 76.413681] gfs2: fsid=loop0.0: fatal: invalid metadata block [ 76.413681] bh = 19 (type: exp=5, found=4) [ 76.413681] function = gfs2_meta_buffer, file = fs/gfs2/meta_io.c, line = 492 and with UBSAN configured we also get complaints like [ 76.373395] UBSAN: shift-out-of-bounds in fs/gfs2/ops_fstype.c:295:19 [ 76.373815] shift exponent 4294967287 is too large for 64-bit type 'long unsigned int' After the patch, these complaints don't appear, mount fails immediately and we get an explanation in dmesg.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: b3b94faa5fe5968827ba0640ee9fba4b3e7f736e , < d6b1e8ea6f3418c3b461ad5a35cdc93c996b2c87 (git)
Affected: b3b94faa5fe5968827ba0640ee9fba4b3e7f736e , < 1ad197097343568066a8ffaa27ee7d0ae6d9f476 (git)
Affected: b3b94faa5fe5968827ba0640ee9fba4b3e7f736e , < 15c83fa0fd659dd9fbdc940a560b61236e876a80 (git)
Affected: b3b94faa5fe5968827ba0640ee9fba4b3e7f736e , < 8b6534c9ae9dba5489703a19d8ba6c8f2cfa33c2 (git)
Affected: b3b94faa5fe5968827ba0640ee9fba4b3e7f736e , < 5fa30be7ba81191b0a0c7239a89befc0c94286d5 (git)
Affected: b3b94faa5fe5968827ba0640ee9fba4b3e7f736e , < 28275a7c84d21c55ab3282d897f284d8d527173c (git)
Affected: b3b94faa5fe5968827ba0640ee9fba4b3e7f736e , < 16670534c7cff1acd918a6a5ec751b14e7436b76 (git)
Affected: b3b94faa5fe5968827ba0640ee9fba4b3e7f736e , < 670f8ce56dd0632dc29a0322e188cc73ce3c6b92 (git)
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    Linux Linux Affected: 2.6.19
Unaffected: 0 , < 2.6.19 (semver)
Unaffected: 4.9.334 , ≤ 4.9.* (semver)
Unaffected: 4.14.300 , ≤ 4.14.* (semver)
Unaffected: 4.19.267 , ≤ 4.19.* (semver)
Unaffected: 5.4.225 , ≤ 5.4.* (semver)
Unaffected: 5.10.156 , ≤ 5.10.* (semver)
Unaffected: 5.15.80 , ≤ 5.15.* (semver)
Unaffected: 6.0.10 , ≤ 6.0.* (semver)
Unaffected: 6.1 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
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              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
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              "version": "6.1",
              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
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              "negate": false,
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ngfs2: Check sb_bsize_shift after reading superblock\n\nFuzzers like to scribble over sb_bsize_shift but in reality it\u0027s very\nunlikely that this field would be corrupted on its own. Nevertheless it\nshould be checked to avoid the possibility of messy mount errors due to\nbad calculations. It\u0027s always a fixed value based on the block size so\nwe can just check that it\u0027s the expected value.\n\nTested with:\n\n    mkfs.gfs2 -O -p lock_nolock /dev/vdb\n    for i in 0 -1 64 65 32 33; do\n        gfs2_edit -p sb field sb_bsize_shift $i /dev/vdb\n        mount /dev/vdb /mnt/test \u0026\u0026 umount /mnt/test\n    done\n\nBefore this patch we get a withdraw after\n\n[   76.413681] gfs2: fsid=loop0.0: fatal: invalid metadata block\n[   76.413681]   bh = 19 (type: exp=5, found=4)\n[   76.413681]   function = gfs2_meta_buffer, file = fs/gfs2/meta_io.c, line = 492\n\nand with UBSAN configured we also get complaints like\n\n[   76.373395] UBSAN: shift-out-of-bounds in fs/gfs2/ops_fstype.c:295:19\n[   76.373815] shift exponent 4294967287 is too large for 64-bit type \u0027long unsigned int\u0027\n\nAfter the patch, these complaints don\u0027t appear, mount fails immediately\nand we get an explanation in dmesg."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-23T13:25:52.015Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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        {
          "url": "https://git.kernel.org/stable/c/1ad197097343568066a8ffaa27ee7d0ae6d9f476"
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        {
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          "url": "https://git.kernel.org/stable/c/8b6534c9ae9dba5489703a19d8ba6c8f2cfa33c2"
        },
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          "url": "https://git.kernel.org/stable/c/5fa30be7ba81191b0a0c7239a89befc0c94286d5"
        },
        {
          "url": "https://git.kernel.org/stable/c/28275a7c84d21c55ab3282d897f284d8d527173c"
        },
        {
          "url": "https://git.kernel.org/stable/c/16670534c7cff1acd918a6a5ec751b14e7436b76"
        },
        {
          "url": "https://git.kernel.org/stable/c/670f8ce56dd0632dc29a0322e188cc73ce3c6b92"
        }
      ],
      "title": "gfs2: Check sb_bsize_shift after reading superblock",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-49769",
    "datePublished": "2025-05-01T14:09:07.526Z",
    "dateReserved": "2025-04-16T07:17:33.804Z",
    "dateUpdated": "2025-12-23T13:25:52.015Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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