CVE-2023-53222 (GCVE-0-2023-53222)
Vulnerability from cvelistv5
Published
2025-09-15 14:21
Modified
2025-09-15 14:21
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: jfs: jfs_dmap: Validate db_l2nbperpage while mounting In jfs_dmap.c at line 381, BLKTODMAP is used to get a logical block number inside dbFree(). db_l2nbperpage, which is the log2 number of blocks per page, is passed as an argument to BLKTODMAP which uses it for shifting. Syzbot reported a shift out-of-bounds crash because db_l2nbperpage is too big. This happens because the large value is set without any validation in dbMount() at line 181. Thus, make sure that db_l2nbperpage is correct while mounting. Max number of blocks per page = Page size / Min block size => log2(Max num_block per page) = log2(Page size / Min block size) = log2(Page size) - log2(Min block size) => Max db_l2nbperpage = L2PSIZE - L2MINBLOCKSIZE
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/11509910c599cbd04585ec35a6d5e1a0053d84c1
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2a03c4e683d33d17b667418eb717b13dda1fac6b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/47b7eaae08e8b2f25bdf37bc14d21be090bcb20f
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8c1efe3f74a7864461b0dff281c5562154b4aa8e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a4855aeb13e4ad1f23e16753b68212e180f7d848
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c7feb54b113802d2aba98708769d3c33fb017254
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/de984faecddb900fa850af4df574a25b32bb93f5
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ef5c205b6e6f8d1f18ef0b4a9832b1b5fa85f7f2
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/jfs/jfs_dmap.c",
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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              "version": "6.5",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\njfs: jfs_dmap: Validate db_l2nbperpage while mounting\n\nIn jfs_dmap.c at line 381, BLKTODMAP is used to get a logical block\nnumber inside dbFree(). db_l2nbperpage, which is the log2 number of\nblocks per page, is passed as an argument to BLKTODMAP which uses it\nfor shifting.\n\nSyzbot reported a shift out-of-bounds crash because db_l2nbperpage is\ntoo big. This happens because the large value is set without any\nvalidation in dbMount() at line 181.\n\nThus, make sure that db_l2nbperpage is correct while mounting.\n\nMax number of blocks per page = Page size / Min block size\n=\u003e log2(Max num_block per page) = log2(Page size / Min block size)\n\t\t\t\t= log2(Page size) - log2(Min block size)\n\n=\u003e Max db_l2nbperpage = L2PSIZE - L2MINBLOCKSIZE"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-09-15T14:21:50.970Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/8c1efe3f74a7864461b0dff281c5562154b4aa8e"
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          "url": "https://git.kernel.org/stable/c/ef5c205b6e6f8d1f18ef0b4a9832b1b5fa85f7f2"
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        },
        {
          "url": "https://git.kernel.org/stable/c/11509910c599cbd04585ec35a6d5e1a0053d84c1"
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      ],
      "title": "jfs: jfs_dmap: Validate db_l2nbperpage while mounting",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2023-53222",
    "datePublished": "2025-09-15T14:21:50.970Z",
    "dateReserved": "2025-09-15T14:19:21.845Z",
    "dateUpdated": "2025-09-15T14:21:50.970Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
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  }
}


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