CVE-2026-46294 (GCVE-0-2026-46294)
Vulnerability from cvelistv5
Published
2026-06-08 15:46
Modified
2026-06-14 18:07
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: dm: fix a buffer overflow in ioctl processing Tony Asleson (using Claude) found a buffer overflow in dm-ioctl in the function retrieve_status: 1. The code in retrieve_status checks that the output string fits into the output buffer and writes the output string there 2. Then, the code aligns the "outptr" variable to the next 8-byte boundary: outptr = align_ptr(outptr); 3. The alignment doesn't check overflow, so outptr could point past the buffer end 4. The "for" loop is iterated again, it executes: remaining = len - (outptr - outbuf); 5. If "outptr" points past "outbuf + len", the arithmetics wraps around and the variable "remaining" contains unusually high number 6. With "remaining" being high, the code writes more data past the end of the buffer Luckily, this bug has no security implications because: 1. Only root can issue device mapper ioctls 2. The commonly used libraries that communicate with device mapper (libdevmapper and devicemapper-rs) use buffer size that is aligned to 8 bytes - thus, "outptr = align_ptr(outptr)" can't overshoot the input buffer and the bug can't happen accidentally
References
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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{
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          "programFiles": [
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      "cpeApplicability": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm: fix a buffer overflow in ioctl processing\n\nTony Asleson (using Claude) found a buffer overflow in dm-ioctl in the\nfunction retrieve_status:\n\n1. The code in retrieve_status checks that the output string fits into\n   the output buffer and writes the output string there\n2. Then, the code aligns the \"outptr\" variable to the next 8-byte\n   boundary:\n\toutptr = align_ptr(outptr);\n3. The alignment doesn\u0027t check overflow, so outptr could point past the\n   buffer end\n4. The \"for\" loop is iterated again, it executes:\n\tremaining = len - (outptr - outbuf);\n5. If \"outptr\" points past \"outbuf + len\", the arithmetics wraps around\n   and the variable \"remaining\" contains unusually high number\n6. With \"remaining\" being high, the code writes more data past the end of\n   the buffer\n\nLuckily, this bug has no security implications because:\n1. Only root can issue device mapper ioctls\n2. The commonly used libraries that communicate with device mapper\n   (libdevmapper and devicemapper-rs) use buffer size that is aligned to\n   8 bytes - thus, \"outptr = align_ptr(outptr)\" can\u0027t overshoot the input\n   buffer and the bug can\u0027t happen accidentally"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-14T18:07:06.194Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/c8c5311237448f6ffeecc9aec2362e3692623668"
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        {
          "url": "https://git.kernel.org/stable/c/448ee8fb79c26a26599ffa4b2adeb4322d3d3d8c"
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          "url": "https://git.kernel.org/stable/c/526ff9126a0ae087b65726e1faf31114c718020d"
        },
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          "url": "https://git.kernel.org/stable/c/f0b0b09d9840838ae77ccdd6a62de0daef4e6e0a"
        },
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          "url": "https://git.kernel.org/stable/c/d271631023cbe1cbe7c31a0275ab797883be6e0a"
        },
        {
          "url": "https://git.kernel.org/stable/c/5af6a879e915ae7bcd83695c316ebb32e1c61bc2"
        },
        {
          "url": "https://git.kernel.org/stable/c/8daa6c708ef524089ae43f2aed9190acb26d7df8"
        },
        {
          "url": "https://git.kernel.org/stable/c/2fa49cc884f6496a915c35621ba4da35649bf159"
        }
      ],
      "title": "dm: fix a buffer overflow in ioctl processing",
      "x_generator": {
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    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-46294",
    "datePublished": "2026-06-08T15:46:21.401Z",
    "dateReserved": "2026-05-13T15:03:33.110Z",
    "dateUpdated": "2026-06-14T18:07:06.194Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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