CVE-2025-71161 (GCVE-0-2025-71161)
Vulnerability from cvelistv5
Published
2026-01-23 15:23
Modified
2026-03-25 10:20
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: dm-verity: disable recursive forward error correction There are two problems with the recursive correction: 1. It may cause denial-of-service. In fec_read_bufs, there is a loop that has 253 iterations. For each iteration, we may call verity_hash_for_block recursively. There is a limit of 4 nested recursions - that means that there may be at most 253^4 (4 billion) iterations. Red Hat QE team actually created an image that pushes dm-verity to this limit - and this image just makes the udev-worker process get stuck in the 'D' state. 2. It doesn't work. In fec_read_bufs we store data into the variable "fio->bufs", but fio bufs is shared between recursive invocations, if "verity_hash_for_block" invoked correction recursively, it would overwrite partially filled fio->bufs.
References
Impacted products
Vendor Product Version
Linux Linux Version: a739ff3f543afbb4a041c16cd0182c8e8d366e70
Version: a739ff3f543afbb4a041c16cd0182c8e8d366e70
Version: a739ff3f543afbb4a041c16cd0182c8e8d366e70
Version: a739ff3f543afbb4a041c16cd0182c8e8d366e70
Version: a739ff3f543afbb4a041c16cd0182c8e8d366e70
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{
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          "programFiles": [
            "drivers/md/dm-verity-fec.c",
            "drivers/md/dm-verity-fec.h",
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm-verity: disable recursive forward error correction\n\nThere are two problems with the recursive correction:\n\n1. It may cause denial-of-service. In fec_read_bufs, there is a loop that\nhas 253 iterations. For each iteration, we may call verity_hash_for_block\nrecursively. There is a limit of 4 nested recursions - that means that\nthere may be at most 253^4 (4 billion) iterations. Red Hat QE team\nactually created an image that pushes dm-verity to this limit - and this\nimage just makes the udev-worker process get stuck in the \u0027D\u0027 state.\n\n2. It doesn\u0027t work. In fec_read_bufs we store data into the variable\n\"fio-\u003ebufs\", but fio bufs is shared between recursive invocations, if\n\"verity_hash_for_block\" invoked correction recursively, it would\noverwrite partially filled fio-\u003ebufs."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-03-25T10:20:05.667Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/e227d2b229c7529bd98d348efc55262ccf24ab35"
        },
        {
          "url": "https://git.kernel.org/stable/c/897d9006e75f46f8bd7df78faa424327ae6a4bcf"
        },
        {
          "url": "https://git.kernel.org/stable/c/4220cb37406915c926c0e4a3dbab77cd9cceeb1e"
        },
        {
          "url": "https://git.kernel.org/stable/c/232948cf600fba69aff36b25d85ef91a73a35756"
        },
        {
          "url": "https://git.kernel.org/stable/c/d9f3e47d3fae0c101d9094bc956ed24e7a0ee801"
        }
      ],
      "title": "dm-verity: disable recursive forward error correction",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-71161",
    "datePublished": "2026-01-23T15:23:59.464Z",
    "dateReserved": "2026-01-13T15:30:19.665Z",
    "dateUpdated": "2026-03-25T10:20:05.667Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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