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dm-verity: disable recursive forward error correction

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2025-71161

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2025-71161

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "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"
  }
]
Related CVEs
CVE-2025-71161

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#39173 · Revision 1
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Publisher date
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