RHSA-2026:30652

Vulnerability from csaf_redhat - Published: 2026-06-28 15:24 - Updated: 2026-06-30 04:28
Summary
Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update
Severity
Important
Notes
Topic: An update for Red Hat Hardened Images RPMs is now available.
Details: This update includes the following RPMs: busybox: * busybox-1.37.0-7.3.hum1 (aarch64, x86_64) * busybox-petitboot-1.37.0-7.3.hum1 (aarch64, x86_64) * busybox-shared-1.37.0-7.3.hum1 (aarch64, x86_64) * busybox-1.37.0-7.3.hum1.src (src) Security Fix(es): busybox: * CVE-2026-29004
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-2026-29004

A flaw was found in BusyBox. A heap buffer overflow vulnerability exists in the Dynamic Host Configuration Protocol version 6 (DHCPv6) client, specifically within the `option_to_env()` function. Network-adjacent attackers can exploit this by sending a crafted DHCPv6 response containing a malformed D6_OPT_DNS_SERVERS option. This can lead to memory corruption, potentially allowing for arbitrary code execution or denial of service on affected embedded systems lacking heap hardening.

8.8 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE-131 - Incorrect Calculation of Buffer Size
Affected products
Product Identifier Version Remediation
Unresolved product id: Red Hat Hardened Images:busybox-main@aarch64 —
Vendor Fix fix
Workaround
Unresolved product id: Red Hat Hardened Images:busybox-main@src —
Vendor Fix fix
Workaround
Unresolved product id: Red Hat Hardened Images:busybox-main@x86_64 —
Vendor Fix fix
Workaround
Threats
Impact Important
References
To clipboard 

{
  "document": {
    "aggregate_severity": {
      "namespace": "https://access.redhat.com/security/updates/classification/",
      "text": "Important"
    },
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Copyright \u00a9 Red Hat, Inc. All rights reserved.",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en",
    "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\nbusybox:\n  * busybox-1.37.0-7.3.hum1 (aarch64, x86_64)\n  * busybox-petitboot-1.37.0-7.3.hum1 (aarch64, x86_64)\n  * busybox-shared-1.37.0-7.3.hum1 (aarch64, x86_64)\n  * busybox-1.37.0-7.3.hum1.src (src)\n\nSecurity Fix(es):\n\nbusybox:\n  * CVE-2026-29004",
        "title": "Details"
      },
      {
        "category": "legal_disclaimer",
        "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.",
        "title": "Terms of Use"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "https://access.redhat.com/security/team/contact/",
      "issuing_authority": "Red Hat Product Security is responsible for vulnerability handling across all Red Hat products and services.",
      "name": "Red Hat Product Security",
      "namespace": "https://www.redhat.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "https://access.redhat.com/errata/RHSA-2026:30652",
        "url": "https://access.redhat.com/errata/RHSA-2026:30652"
      },
      {
        "category": "external",
        "summary": "https://access.redhat.com/security/cve/CVE-2026-29004",
        "url": "https://access.redhat.com/security/cve/CVE-2026-29004"
      },
      {
        "category": "external",
        "summary": "https://access.redhat.com/security/updates/classification/",
        "url": "https://access.redhat.com/security/updates/classification/"
      },
      {
        "category": "external",
        "summary": "https://images.redhat.com/",
        "url": "https://images.redhat.com/"
      },
      {
        "category": "self",
        "summary": "Canonical URL",
        "url": "https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_30652.json"
      }
    ],
    "title": "Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update",
    "tracking": {
      "current_release_date": "2026-06-30T04:28:00+00:00",
      "generator": {
        "date": "2026-06-30T04:28:00+00:00",
        "engine": {
          "name": "Red Hat SDEngine",
          "version": "5.3.0"
        }
      },
      "id": "RHSA-2026:30652",
      "initial_release_date": "2026-06-28T15:24:16+00:00",
      "revision_history": [
        {
          "date": "2026-06-28T15:24:16+00:00",
          "number": "1",
          "summary": "Initial version"
        },
        {
          "date": "2026-06-28T15:25:10+00:00",
          "number": "2",
          "summary": "Last updated version"
        },
        {
          "date": "2026-06-30T04:28:00+00:00",
          "number": "3",
          "summary": "Last generated version"
        }
      ],
      "status": "final",
      "version": "3"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_name",
                "name": "Red Hat Hardened Images",
                "product": {
                  "name": "Red Hat Hardened Images",
                  "product_id": "Red Hat Hardened Images",
                  "product_identification_helper": {
                    "cpe": "cpe:/a:redhat:hummingbird:1"
                  }
                }
              }
            ],
            "category": "product_family",
            "name": "Red Hat Hardened Images"
          },
          {
            "branches": [
              {
                "category": "product_version",
                "name": "busybox-main@aarch64",
                "product": {
                  "name": "busybox-main@aarch64",
                  "product_id": "busybox-main@aarch64",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/redhat/busybox@1.37.0-7.3.hum1?arch=aarch64\u0026distro=hummingbird-20251124\u0026repository_id=public-hummingbird-aarch64-rpms"
                  }
                }
              }
            ],
            "category": "architecture",
            "name": "aarch64"
          },
          {
            "branches": [
              {
                "category": "product_version",
                "name": "busybox-main@src",
                "product": {
                  "name": "busybox-main@src",
                  "product_id": "busybox-main@src",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/redhat/busybox@1.37.0-7.3.hum1?arch=src\u0026distro=hummingbird-20251124\u0026repository_id=public-hummingbird-source-rpms"
                  }
                }
              }
            ],
            "category": "architecture",
            "name": "src"
          },
          {
            "branches": [
              {
                "category": "product_version",
                "name": "busybox-main@x86_64",
                "product": {
                  "name": "busybox-main@x86_64",
                  "product_id": "busybox-main@x86_64",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/redhat/busybox@1.37.0-7.3.hum1?arch=x86_64\u0026distro=hummingbird-20251124\u0026repository_id=public-hummingbird-x86_64-rpms"
                  }
                }
              }
            ],
            "category": "architecture",
            "name": "x86_64"
          }
        ],
        "category": "vendor",
        "name": "Red Hat"
      }
    ],
    "relationships": [
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "busybox-main@aarch64 as a component of Red Hat Hardened Images",
          "product_id": "Red Hat Hardened Images:busybox-main@aarch64"
        },
        "product_reference": "busybox-main@aarch64",
        "relates_to_product_reference": "Red Hat Hardened Images"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "busybox-main@src as a component of Red Hat Hardened Images",
          "product_id": "Red Hat Hardened Images:busybox-main@src"
        },
        "product_reference": "busybox-main@src",
        "relates_to_product_reference": "Red Hat Hardened Images"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "busybox-main@x86_64 as a component of Red Hat Hardened Images",
          "product_id": "Red Hat Hardened Images:busybox-main@x86_64"
        },
        "product_reference": "busybox-main@x86_64",
        "relates_to_product_reference": "Red Hat Hardened Images"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-29004",
      "cwe": {
        "id": "CWE-131",
        "name": "Incorrect Calculation of Buffer Size"
      },
      "discovery_date": "2026-05-04T19:03:24.638414+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2466526"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in BusyBox. A heap buffer overflow vulnerability exists in the Dynamic Host Configuration Protocol version 6 (DHCPv6) client, specifically within the `option_to_env()` function. Network-adjacent attackers can exploit this by sending a crafted DHCPv6 response containing a malformed D6_OPT_DNS_SERVERS option. This can lead to memory corruption, potentially allowing for arbitrary code execution or denial of service on affected embedded systems lacking heap hardening.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "BusyBox: BusyBox: Arbitrary Code Execution via DHCPv6 Client Heap Buffer Overflow",
          "title": "Vulnerability summary"
        },
        {
          "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:busybox-main@aarch64",
          "Red Hat Hardened Images:busybox-main@src",
          "Red Hat Hardened Images:busybox-main@x86_64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-29004"
        },
        {
          "category": "external",
          "summary": "RHBZ#2466526",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2466526"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-29004",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-29004"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-29004",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-29004"
        },
        {
          "category": "external",
          "summary": "https://busybox.net/",
          "url": "https://busybox.net/"
        },
        {
          "category": "external",
          "summary": "https://github.com/vda-linux/busybox_mirror/commit/42202bfb1e6ac51fa995beda8be4d7b654aeee2a",
          "url": "https://github.com/vda-linux/busybox_mirror/commit/42202bfb1e6ac51fa995beda8be4d7b654aeee2a"
        },
        {
          "category": "external",
          "summary": "https://github.com/vda-linux/busybox_mirror/commit/d368f3f7836d1c2484c8f839316e5c93e76d4409",
          "url": "https://github.com/vda-linux/busybox_mirror/commit/d368f3f7836d1c2484c8f839316e5c93e76d4409"
        },
        {
          "category": "external",
          "summary": "https://www.vulncheck.com/advisories/busybox-dhcpv6-client-heap-buffer-overflow-via-dns-servers",
          "url": "https://www.vulncheck.com/advisories/busybox-dhcpv6-client-heap-buffer-overflow-via-dns-servers"
        }
      ],
      "release_date": "2026-05-04T18:05:18.962000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-06-28T15:24:16+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:busybox-main@aarch64",
            "Red Hat Hardened Images:busybox-main@src",
            "Red Hat Hardened Images:busybox-main@x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:30652"
        },
        {
          "category": "workaround",
          "details": "To mitigate this vulnerability, restrict network access to systems running BusyBox as a DHCPv6 client, ensuring that only trusted DHCPv6 servers can communicate with it. If the DHCPv6 client functionality is not essential for the system\u0027s operation, consider disabling the `udhcpc6` service or configuring it to only accept responses from known, trusted sources. Consult product-specific documentation for details on managing network services and configurations. Any changes to network service configurations may require a service restart to take effect, potentially impacting network connectivity.",
          "product_ids": [
            "Red Hat Hardened Images:busybox-main@aarch64",
            "Red Hat Hardened Images:busybox-main@src",
            "Red Hat Hardened Images:busybox-main@x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "ADJACENT_NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "Red Hat Hardened Images:busybox-main@aarch64",
            "Red Hat Hardened Images:busybox-main@src",
            "Red Hat Hardened Images:busybox-main@x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "BusyBox: BusyBox: Arbitrary Code Execution via DHCPv6 Client Heap Buffer Overflow"
    }
  ]
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





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.


Detection rules are retrieved from Rulezet.