CVE-2025-71161 (GCVE-0-2025-71161)
Vulnerability from cvelistv5
Published
2026-01-23 15:23
Modified
2026-10-19 18:15
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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
Version: a739ff3f543afbb4a041c16cd0182c8e8d366e70
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No race or uncontrollable memory layout is required.\\nPR:N - DM table creation requires CAP_SYS_ADMIN in the initial user namespace, but that is victim-side setup. A malicious configured network-block peer requires no account or privilege on the affected system to return crafted blocks.\\nUI:N - Once the mapping is active, automatic udev probing, boot-time access, or ordinary filesystem I/O triggers FEC without requiring a user action.\\nS:U - The vulnerable processing and resulting availability loss occur within the same kernel security authority, without crossing a VM, IOMMU, or sandbox boundary.\\nC:N - Recursive calls only clobber bounded per-I/O Reed-Solomon working data, and corrected output is cryptographically revalidated before being copied to its destination. The flaw provides no disclosure or read primitive.\\nI:N - Although nested decoding corrupts outer intermediate results, the wanted digest is checked before corrected data is used, so failure produces an I/O error rather than attacker-selected data. No arbitrary-write or control-flow primitive results from this flaw.\\nA:H - The crafted blocks can force approximately 4.1 billion iterations and leave I/O submitters such as udev workers blocked in uninterruptible sleep. On a boot or operational image this can prevent startup or render the device and dependent services unavailable.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"a739ff3f543afbb4a041c16cd0182c8e8d366e70\", \"lessThan\": \"8b821ca892cfeeaf0bedc9fc72717294f67144d5\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"a739ff3f543afbb4a041c16cd0182c8e8d366e70\", \"lessThan\": \"e227d2b229c7529bd98d348efc55262ccf24ab35\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"a739ff3f543afbb4a041c16cd0182c8e8d366e70\", \"lessThan\": \"897d9006e75f46f8bd7df78faa424327ae6a4bcf\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"a739ff3f543afbb4a041c16cd0182c8e8d366e70\", \"lessThan\": \"4220cb37406915c926c0e4a3dbab77cd9cceeb1e\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"a739ff3f543afbb4a041c16cd0182c8e8d366e70\", \"lessThan\": \"232948cf600fba69aff36b25d85ef91a73a35756\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"a739ff3f543afbb4a041c16cd0182c8e8d366e70\", \"lessThan\": \"d9f3e47d3fae0c101d9094bc956ed24e7a0ee801\", \"versionType\": \"git\"}], \"programFiles\": [\"drivers/md/dm-verity-fec.c\", \"drivers/md/dm-verity-fec.h\", \"drivers/md/dm-verity-target.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.5\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"4.5\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.15.209\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.167\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.130\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.78\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.6\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"6.19\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/md/dm-verity-fec.c\", \"drivers/md/dm-verity-fec.h\", \"drivers/md/dm-verity-target.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/8b821ca892cfeeaf0bedc9fc72717294f67144d5\"}, {\"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\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.209\", \"versionStartIncluding\": \"4.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.167\", \"versionStartIncluding\": \"4.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.130\", \"versionStartIncluding\": \"4.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.78\", \"versionStartIncluding\": \"4.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.6\", \"versionStartIncluding\": \"4.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.19\", \"versionStartIncluding\": \"4.5\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T12:12:26.264Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-71161\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T18:15:16.401Z\", \"dateReserved\": \"2026-01-13T15:30:19.665Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-01-23T15:23:59.464Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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