RHSA-2026:26713

Vulnerability from csaf_redhat - Published: 2026-06-17 17:04 - Updated: 2026-06-30 04:19
Summary
Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update
Severity
Important
Notes
Topic: An update for Red Hat Hardened Images RPMs is now available.
Details: This update includes the following RPMs: dracut: * dracut-109-6.hum1 (aarch64, x86_64) * dracut-caps-109-6.hum1 (aarch64, x86_64) * dracut-config-generic-109-6.hum1 (aarch64, x86_64) * dracut-config-rescue-109-6.hum1 (aarch64, x86_64) * dracut-live-109-6.hum1 (aarch64, x86_64) * dracut-network-109-6.hum1 (aarch64, x86_64) * dracut-squash-109-6.hum1 (aarch64, x86_64) * dracut-tools-109-6.hum1 (aarch64, x86_64) * dracut-109-6.hum1.src (src)
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
CVE-2026-6893

A flaw was found in dracut. A remote attacker on the adjacent network can exploit this vulnerability by providing specially crafted DHCP (Dynamic Host Configuration Protocol) options, such as a malicious hostname, to a system using dracut's legacy DHCP path. These options are improperly handled and written into temporary shell scripts without proper escaping, leading to command injection. This allows the attacker to achieve root code execution within the initramfs, potentially compromising the system's boot and network behavior.

7.5 (High)
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Affected products
Product Identifier Version Remediation
Unresolved product id: Red Hat Hardened Images:dracut-main@aarch64 —
Vendor Fix fix
Workaround
Unresolved product id: Red Hat Hardened Images:dracut-main@src —
Vendor Fix fix
Workaround
Unresolved product id: Red Hat Hardened Images:dracut-main@x86_64 —
Vendor Fix fix
Workaround
Threats
Impact Important
References
Acknowledgments
AISLE Research
To clipboard 

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    "notes": [
      {
        "category": "summary",
        "text": "An update for Red Hat Hardened Images RPMs is now available.",
        "title": "Topic"
      },
      {
        "category": "general",
        "text": "This update includes the following RPMs:\n\ndracut:\n  * dracut-109-6.hum1 (aarch64, x86_64)\n  * dracut-caps-109-6.hum1 (aarch64, x86_64)\n  * dracut-config-generic-109-6.hum1 (aarch64, x86_64)\n  * dracut-config-rescue-109-6.hum1 (aarch64, x86_64)\n  * dracut-live-109-6.hum1 (aarch64, x86_64)\n  * dracut-network-109-6.hum1 (aarch64, x86_64)\n  * dracut-squash-109-6.hum1 (aarch64, x86_64)\n  * dracut-tools-109-6.hum1 (aarch64, x86_64)\n  * dracut-109-6.hum1.src (src)",
        "title": "Details"
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        "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.",
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    "references": [
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        "category": "self",
        "summary": "https://access.redhat.com/errata/RHSA-2026:26713",
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        "url": "https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_26713.json"
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    ],
    "title": "Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update",
    "tracking": {
      "current_release_date": "2026-06-30T04:19:59+00:00",
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      "revision_history": [
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          "date": "2026-06-17T17:04:59+00:00",
          "number": "1",
          "summary": "Initial version"
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          "number": "2",
          "summary": "Last updated version"
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          },
          {
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                "name": "dracut-main@aarch64",
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                  "product_identification_helper": {
                    "purl": "pkg:rpm/redhat/dracut@109-6.hum1?arch=aarch64\u0026distro=hummingbird-20251124\u0026repository_id=public-hummingbird-aarch64-rpms"
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        "relates_to_product_reference": "Red Hat Hardened Images"
      }
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  },
  "vulnerabilities": [
    {
      "acknowledgments": [
        {
          "names": [
            "AISLE Research"
          ]
        }
      ],
      "cve": "CVE-2026-6893",
      "cwe": {
        "id": "CWE-78",
        "name": "Improper Neutralization of Special Elements used in an OS Command (\u0027OS Command Injection\u0027)"
      },
      "discovery_date": "2026-04-21T02:37:23+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2459963"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in dracut. A remote attacker on the adjacent network can exploit this vulnerability by providing specially crafted DHCP (Dynamic Host Configuration Protocol) options, such as a malicious hostname, to a system using dracut\u0027s legacy DHCP path. These options are improperly handled and written into temporary shell scripts without proper escaping, leading to command injection. This allows the attacker to achieve root code execution within the initramfs, potentially compromising the system\u0027s boot and network behavior.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "dracut: dracut: Root code execution via DHCP options command injection",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This is an Important vulnerability in dracut\u0027s legacy DHCP client script (`dhclient-script.sh`) that allows command injection. An attacker on the adjacent network can exploit this by providing specially crafted DHCP options, leading to root code execution within the initramfs. This primarily affects systems configured to use DHCP for network setup during the initial boot phase.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
        "fixed": [
          "Red Hat Hardened Images:dracut-main@aarch64",
          "Red Hat Hardened Images:dracut-main@src",
          "Red Hat Hardened Images:dracut-main@x86_64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-6893"
        },
        {
          "category": "external",
          "summary": "RHBZ#2459963",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2459963"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-6893",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-6893"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-6893",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-6893"
        }
      ],
      "release_date": "2026-06-10T19:39:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-06-17T17:04:59+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
          "product_ids": [
            "Red Hat Hardened Images:dracut-main@aarch64",
            "Red Hat Hardened Images:dracut-main@src",
            "Red Hat Hardened Images:dracut-main@x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:26713"
        },
        {
          "category": "workaround",
          "details": "To mitigate this issue, ensure that systems configured to obtain network settings via DHCP in the initramfs are only booted on trusted networks. This vulnerability requires an attacker to control a DHCP server on the adjacent network segment. If network configuration via DHCP is not strictly necessary during the initramfs phase, consider using static network configuration.",
          "product_ids": [
            "Red Hat Hardened Images:dracut-main@aarch64",
            "Red Hat Hardened Images:dracut-main@src",
            "Red Hat Hardened Images:dracut-main@x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "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"
          },
          "products": [
            "Red Hat Hardened Images:dracut-main@aarch64",
            "Red Hat Hardened Images:dracut-main@src",
            "Red Hat Hardened Images:dracut-main@x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "dracut: dracut: Root code execution via DHCP options command injection"
    }
  ]
}


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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.


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