CVE-2025-38415 (GCVE-0-2025-38415)
Vulnerability from cvelistv5
Published
2025-07-25 13:32
Modified
2025-07-28 04:21
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: Squashfs: check return result of sb_min_blocksize Syzkaller reports an "UBSAN: shift-out-of-bounds in squashfs_bio_read" bug. Syzkaller forks multiple processes which after mounting the Squashfs filesystem, issues an ioctl("/dev/loop0", LOOP_SET_BLOCK_SIZE, 0x8000). Now if this ioctl occurs at the same time another process is in the process of mounting a Squashfs filesystem on /dev/loop0, the failure occurs. When this happens the following code in squashfs_fill_super() fails. ---- msblk->devblksize = sb_min_blocksize(sb, SQUASHFS_DEVBLK_SIZE); msblk->devblksize_log2 = ffz(~msblk->devblksize); ---- sb_min_blocksize() returns 0, which means msblk->devblksize is set to 0. As a result, ffz(~msblk->devblksize) returns 64, and msblk->devblksize_log2 is set to 64. This subsequently causes the UBSAN: shift-out-of-bounds in fs/squashfs/block.c:195:36 shift exponent 64 is too large for 64-bit type 'u64' (aka 'unsigned long long') This commit adds a check for a 0 return by sb_min_blocksize().
References
Impacted products
Vendor Product Version
Linux Linux Version: 0aa666190509ffab81c202c5095a166be23961ac
Version: 0aa666190509ffab81c202c5095a166be23961ac
Version: 0aa666190509ffab81c202c5095a166be23961ac
Version: 0aa666190509ffab81c202c5095a166be23961ac
Version: 0aa666190509ffab81c202c5095a166be23961ac
Version: 0aa666190509ffab81c202c5095a166be23961ac
Version: 0aa666190509ffab81c202c5095a166be23961ac
Version: 0aa666190509ffab81c202c5095a166be23961ac
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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/squashfs/super.c"
          ],
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              "version": "0",
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              "status": "unaffected",
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              "status": "unaffected",
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              "version": "6.6.94",
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              "version": "6.12.34",
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              "version": "6.15.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.16",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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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\nSquashfs: check return result of sb_min_blocksize\n\nSyzkaller reports an \"UBSAN: shift-out-of-bounds in squashfs_bio_read\" bug.\n\nSyzkaller forks multiple processes which after mounting the Squashfs\nfilesystem, issues an ioctl(\"/dev/loop0\", LOOP_SET_BLOCK_SIZE, 0x8000). \nNow if this ioctl occurs at the same time another process is in the\nprocess of mounting a Squashfs filesystem on /dev/loop0, the failure\noccurs.  When this happens the following code in squashfs_fill_super()\nfails.\n\n----\nmsblk-\u003edevblksize = sb_min_blocksize(sb, SQUASHFS_DEVBLK_SIZE);\nmsblk-\u003edevblksize_log2 = ffz(~msblk-\u003edevblksize);\n----\n\nsb_min_blocksize() returns 0, which means msblk-\u003edevblksize is set to 0.\n\nAs a result, ffz(~msblk-\u003edevblksize) returns 64, and msblk-\u003edevblksize_log2\nis set to 64.\n\nThis subsequently causes the\n\nUBSAN: shift-out-of-bounds in fs/squashfs/block.c:195:36\nshift exponent 64 is too large for 64-bit type \u0027u64\u0027 (aka\n\u0027unsigned long long\u0027)\n\nThis commit adds a check for a 0 return by sb_min_blocksize()."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-07-28T04:21:29.253Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/db7096ea160e40d78c67fce52e7cc51bde049497"
        },
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          "url": "https://git.kernel.org/stable/c/549f9e3d7b60d53808c98b9fde49b4f46d0524a5"
        },
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          "url": "https://git.kernel.org/stable/c/5c51aa862cbeed2f3887f0382a2708956710bd68"
        },
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        },
        {
          "url": "https://git.kernel.org/stable/c/734aa85390ea693bb7eaf2240623d41b03705c84"
        }
      ],
      "title": "Squashfs: check return result of sb_min_blocksize",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38415",
    "datePublished": "2025-07-25T13:32:09.711Z",
    "dateReserved": "2025-04-16T04:51:24.013Z",
    "dateUpdated": "2025-07-28T04:21:29.253Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-38415\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-07-25T14:15:33.250\",\"lastModified\":\"2025-07-25T15:29:19.837\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nSquashfs: check return result of sb_min_blocksize\\n\\nSyzkaller reports an \\\"UBSAN: shift-out-of-bounds in squashfs_bio_read\\\" bug.\\n\\nSyzkaller forks multiple processes which after mounting the Squashfs\\nfilesystem, issues an ioctl(\\\"/dev/loop0\\\", LOOP_SET_BLOCK_SIZE, 0x8000). \\nNow if this ioctl occurs at the same time another process is in the\\nprocess of mounting a Squashfs filesystem on /dev/loop0, the failure\\noccurs.  When this happens the following code in squashfs_fill_super()\\nfails.\\n\\n----\\nmsblk-\u003edevblksize = sb_min_blocksize(sb, SQUASHFS_DEVBLK_SIZE);\\nmsblk-\u003edevblksize_log2 = ffz(~msblk-\u003edevblksize);\\n----\\n\\nsb_min_blocksize() returns 0, which means msblk-\u003edevblksize is set to 0.\\n\\nAs a result, ffz(~msblk-\u003edevblksize) returns 64, and msblk-\u003edevblksize_log2\\nis set to 64.\\n\\nThis subsequently causes the\\n\\nUBSAN: shift-out-of-bounds in fs/squashfs/block.c:195:36\\nshift exponent 64 is too large for 64-bit type \u0027u64\u0027 (aka\\n\u0027unsigned long long\u0027)\\n\\nThis commit adds a check for a 0 return by sb_min_blocksize().\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0aff95d9bc7fb5400ca8af507429c4b067bdb425\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/295ab18c2dbce8d0ac6ecf7c5187e16e1ac8b282\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4f99357dadbf9c979ad737156ad4c37fadf7c56b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/549f9e3d7b60d53808c98b9fde49b4f46d0524a5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5c51aa862cbeed2f3887f0382a2708956710bd68\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6abf6b78c6fb112eee495f5636ffcc350dd2ce25\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/734aa85390ea693bb7eaf2240623d41b03705c84\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/db7096ea160e40d78c67fce52e7cc51bde049497\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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