GHSA-M3CP-9JQ6-3GG3
Vulnerability from github – Published: 2026-01-23 18:31 – Updated: 2026-10-15 03:35In the Linux kernel, the following vulnerability has been resolved:
dm-verity: disable recursive forward error correction
There are two problems with the recursive correction:
-
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.
-
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.
{
"affected": [],
"aliases": [
"CVE-2025-71161"
],
"database_specific": {
"cwe_ids": [
"CWE-193",
"CWE-400"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-01-23T16:15:53Z",
"severity": "MODERATE"
},
"details": "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.",
"id": "GHSA-m3cp-9jq6-3gg3",
"modified": "2026-10-15T03:35:08Z",
"published": "2026-01-23T18:31:28Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-71161"
},
{
"type": "WEB",
"url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"
},
{
"type": "WEB",
"url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html"
},
{
"type": "WEB",
"url": "https://cert-portal.siemens.com/productcert/html/ssa-457936.html"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/232948cf600fba69aff36b25d85ef91a73a35756"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/4220cb37406915c926c0e4a3dbab77cd9cceeb1e"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/897d9006e75f46f8bd7df78faa424327ae6a4bcf"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/8b821ca892cfeeaf0bedc9fc72717294f67144d5"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d9f3e47d3fae0c101d9094bc956ed24e7a0ee801"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/e227d2b229c7529bd98d348efc55262ccf24ab35"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
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