FKIE_CVE-2026-15816

Vulnerability from fkie_nvd - Published: 2026-08-07 11:17 - Updated: 2026-10-30 18:17
Summary
A flaw was found in dracut. The die() error-handling function writes its message into a shell script under the initramfs emergency-hook directory without properly shell-quoting it. When the message contains data derived from the DHCP ROOT_PATH option, an attacker on the adjacent network who controls a rogue DHCP server can inject a command-substitution sequence that executes as root the next time dracut sources its emergency hook scripts during standard boot-failure handling.
References
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2026:54571
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2026:54575
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2026:54576
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2026:57580
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2026:57772
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2026:57775
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2026:57785
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2026:60440
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2026:60445
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2026:61252
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2026:62269
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2026:62409
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2026:62549
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2026:63041
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2026:63044
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2026:65839
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2026:65851
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2026:66357
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2026:67857
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2026:69118
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2026:69119
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2026:70586
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2026:70615
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2026:74499
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2026:79114
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2026:90272
secalert@redhat.comhttps://access.redhat.com/security/cve/CVE-2026-15816
secalert@redhat.comhttps://bugzilla.redhat.com/show_bug.cgi?id=2459963
secalert@redhat.comhttps://bugzilla.redhat.com/show_bug.cgi?id=2500889
secalert@redhat.comhttps://github.com/dracutdevs/dracut/blob/master/modules.d/40network/netroot.sh
secalert@redhat.comhttps://github.com/dracutdevs/dracut/blob/master/modules.d/99base/dracut-lib.sh
Impacted products
Vendor Product Version

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          "cpes": [
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          "packageName": "dracut",
          "product": "Red Hat Hardened Images",
          "vendor": "Red Hat"
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      "source": "secalert@redhat.com"
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  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A flaw was found in dracut. The die() error-handling function writes its message into a shell script under the initramfs emergency-hook directory without properly shell-quoting it. When the message contains data derived from the DHCP ROOT_PATH option, an attacker on the adjacent network who controls a rogue DHCP server can inject a command-substitution sequence that executes as root the next time dracut sources its emergency hook scripts during standard boot-failure handling."
    }
  ],
  "id": "CVE-2026-15816",
  "lastModified": "2026-10-30T18:17:28.643",
  "metrics": {
    "cvssMetricV31": [
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        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "ADJACENT_NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.6,
        "impactScore": 5.9,
        "source": "secalert@redhat.com",
        "type": "Secondary"
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    "ssvcV203": [
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        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
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          "options": [
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              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-08-07T14:32:54.964951Z",
          "version": "2.0.3"
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  "published": "2026-08-07T11:17:05.100",
  "references": [
    {
      "source": "secalert@redhat.com",
      "url": "https://access.redhat.com/errata/RHSA-2026:54571"
    },
    {
      "source": "secalert@redhat.com",
      "url": "https://access.redhat.com/errata/RHSA-2026:54575"
    },
    {
      "source": "secalert@redhat.com",
      "url": "https://access.redhat.com/errata/RHSA-2026:54576"
    },
    {
      "source": "secalert@redhat.com",
      "url": "https://access.redhat.com/errata/RHSA-2026:57580"
    },
    {
      "source": "secalert@redhat.com",
      "url": "https://access.redhat.com/errata/RHSA-2026:57772"
    },
    {
      "source": "secalert@redhat.com",
      "url": "https://access.redhat.com/errata/RHSA-2026:57775"
    },
    {
      "source": "secalert@redhat.com",
      "url": "https://access.redhat.com/errata/RHSA-2026:57785"
    },
    {
      "source": "secalert@redhat.com",
      "url": "https://access.redhat.com/errata/RHSA-2026:60440"
    },
    {
      "source": "secalert@redhat.com",
      "url": "https://access.redhat.com/errata/RHSA-2026:60445"
    },
    {
      "source": "secalert@redhat.com",
      "url": "https://access.redhat.com/errata/RHSA-2026:61252"
    },
    {
      "source": "secalert@redhat.com",
      "url": "https://access.redhat.com/errata/RHSA-2026:62269"
    },
    {
      "source": "secalert@redhat.com",
      "url": "https://access.redhat.com/errata/RHSA-2026:62409"
    },
    {
      "source": "secalert@redhat.com",
      "url": "https://access.redhat.com/errata/RHSA-2026:62549"
    },
    {
      "source": "secalert@redhat.com",
      "url": "https://access.redhat.com/errata/RHSA-2026:63041"
    },
    {
      "source": "secalert@redhat.com",
      "url": "https://access.redhat.com/errata/RHSA-2026:63044"
    },
    {
      "source": "secalert@redhat.com",
      "url": "https://access.redhat.com/errata/RHSA-2026:65839"
    },
    {
      "source": "secalert@redhat.com",
      "url": "https://access.redhat.com/errata/RHSA-2026:65851"
    },
    {
      "source": "secalert@redhat.com",
      "url": "https://access.redhat.com/errata/RHSA-2026:66357"
    },
    {
      "source": "secalert@redhat.com",
      "url": "https://access.redhat.com/errata/RHSA-2026:67857"
    },
    {
      "source": "secalert@redhat.com",
      "url": "https://access.redhat.com/errata/RHSA-2026:69118"
    },
    {
      "source": "secalert@redhat.com",
      "url": "https://access.redhat.com/errata/RHSA-2026:69119"
    },
    {
      "source": "secalert@redhat.com",
      "url": "https://access.redhat.com/errata/RHSA-2026:70586"
    },
    {
      "source": "secalert@redhat.com",
      "url": "https://access.redhat.com/errata/RHSA-2026:70615"
    },
    {
      "source": "secalert@redhat.com",
      "url": "https://access.redhat.com/errata/RHSA-2026:74499"
    },
    {
      "source": "secalert@redhat.com",
      "url": "https://access.redhat.com/errata/RHSA-2026:79114"
    },
    {
      "source": "secalert@redhat.com",
      "url": "https://access.redhat.com/errata/RHSA-2026:90272"
    },
    {
      "source": "secalert@redhat.com",
      "url": "https://access.redhat.com/security/cve/CVE-2026-15816"
    },
    {
      "source": "secalert@redhat.com",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2459963"
    },
    {
      "source": "secalert@redhat.com",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2500889"
    },
    {
      "source": "secalert@redhat.com",
      "url": "https://github.com/dracutdevs/dracut/blob/master/modules.d/40network/netroot.sh"
    },
    {
      "source": "secalert@redhat.com",
      "url": "https://github.com/dracutdevs/dracut/blob/master/modules.d/99base/dracut-lib.sh"
    }
  ],
  "sourceIdentifier": "secalert@redhat.com",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-78"
        }
      ],
      "source": "secalert@redhat.com",
      "type": "Secondary"
    }
  ]
}



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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Events included in the timeline

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    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.