fkie_cve-2023-53222
Vulnerability from fkie_nvd
Published
2025-09-15 15:15
Modified
2025-12-04 15:00
Severity ?
7.1 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
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/11509910c599cbd04585ec35a6d5e1a0053d84c1Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2a03c4e683d33d17b667418eb717b13dda1fac6bPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/47b7eaae08e8b2f25bdf37bc14d21be090bcb20fPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8c1efe3f74a7864461b0dff281c5562154b4aa8ePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a4855aeb13e4ad1f23e16753b68212e180f7d848Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c7feb54b113802d2aba98708769d3c33fb017254Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/de984faecddb900fa850af4df574a25b32bb93f5Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ef5c205b6e6f8d1f18ef0b4a9832b1b5fa85f7f2Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *


To clipboard 

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      "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"
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  "id": "CVE-2023-53222",
  "lastModified": "2025-12-04T15:00:14.343",
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          "attackVector": "LOCAL",
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          "baseScore": 7.1,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
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  "published": "2025-09-15T15:15:48.983",
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