CVE-2026-46023 (GCVE-0-2026-46023)
Vulnerability from cvelistv5
Published
2026-05-27 12:56
Modified
2026-06-14 17:48
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: dm mirror: fix integer overflow in create_dirty_log() The argument count calculation in create_dirty_log() performs `*args_used = 2 + param_count` before validating against argc. When a user provides a param_count close to UINT_MAX via the device mapper table string, this unsigned addition wraps around to a small value, causing the subsequent `argc < *args_used` check to be bypassed. The overflowed param_count is then passed as argc to dm_dirty_log_create(), where it can cause out-of-bounds reads on the argv array. Fix by comparing param_count against argc - 2 before performing the addition, following the same pattern used by parse_features() in the same file. Since argc >= 2 is already guaranteed, the subtraction is safe.
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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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm mirror: fix integer overflow in create_dirty_log()\n\nThe argument count calculation in create_dirty_log() performs\n`*args_used = 2 + param_count` before validating against argc. When a\nuser provides a param_count close to UINT_MAX via the device mapper\ntable string, this unsigned addition wraps around to a small value,\ncausing the subsequent `argc \u003c *args_used` check to be bypassed.\n\nThe overflowed param_count is then passed as argc to dm_dirty_log_create(),\nwhere it can cause out-of-bounds reads on the argv array.\n\nFix by comparing param_count against argc - 2 before performing the\naddition, following the same pattern used by parse_features() in the\nsame file. Since argc \u003e= 2 is already guaranteed, the subtraction is\nsafe."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-14T17:48:40.907Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/e5e0ae3237584ebef510366c4cb3d5cc7c22b610"
        },
        {
          "url": "https://git.kernel.org/stable/c/249c831183fb806c8e3b14c7c4c1d2fb68cf37fb"
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          "url": "https://git.kernel.org/stable/c/ae59b3025609d5a0a39cf5b2b94e2467f6231573"
        },
        {
          "url": "https://git.kernel.org/stable/c/35f6b3281efd44d19110574663bc17a610bc73b9"
        },
        {
          "url": "https://git.kernel.org/stable/c/47dad9eea75d33212d3d2cea10e7ed6a1bfc0713"
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        {
          "url": "https://git.kernel.org/stable/c/87c99a50e0fdc68a5b9b52a94d49452cd3ff02ca"
        },
        {
          "url": "https://git.kernel.org/stable/c/17a08791d428885d00e510864283a7b839792368"
        },
        {
          "url": "https://git.kernel.org/stable/c/4c788c6f921b22f9b6c3f316c4a071c05683e7de"
        }
      ],
      "title": "dm mirror: fix integer overflow in create_dirty_log()",
      "x_generator": {
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      }
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-46023",
    "datePublished": "2026-05-27T12:56:28.756Z",
    "dateReserved": "2026-05-13T15:03:33.092Z",
    "dateUpdated": "2026-06-14T17:48:40.907Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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