RHSA-2026:60445

Vulnerability from csaf_redhat - Published: 2026-09-01 21:46 - Updated: 2026-09-02 08:11
Summary
Red Hat Security Advisory: OpenShift Container Platform 4.20.36 bug fix and security update
Severity
Important
Notes
Topic: Red Hat OpenShift Container Platform release 4.20.36 is now available with updates to packages and images that fix several bugs and add enhancements. This release includes a security update for Red Hat OpenShift Container Platform 4.20. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: Red Hat OpenShift Container Platform is Red Hat's cloud computing Kubernetes application platform solution designed for on-premise or private cloud deployments. This advisory contains the container images for Red Hat OpenShift Container Platform 4.20.36. See the following advisory for the RPM packages for this release: https://access.redhat.com/errata/RHSA-2026:60444 Space precludes documenting all of the container images in this advisory. See the following Release Notes documentation, which will be updated shortly for this release, for details about these changes: https://docs.redhat.com/en/documentation/openshift_container_platform/4.20/html/release_notes/ Security Fix(es): * dracut: dracut: root code execution via unescaped error message written to sourced emergency hook script in die() (CVE-2026-15816) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section. All OpenShift Container Platform 4.20 users are advised to upgrade to these updated packages and images when they are available in the appropriate release channel. To check for available updates, use the OpenShift CLI (oc) or web console. Instructions for upgrading a cluster are available at https://docs.redhat.com/en/documentation/openshift_container_platform/4.20/html-single/updating_clusters/index#updating-cluster-cli.
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-2026-15816

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.

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: 9Base-RHOSE-4.20:rhcos-aarch64-4.20.9.6.202608260604-0 —
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.20:rhcos-ppc64le-4.20.9.6.202608260604-0 —
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.20:rhcos-s390x-4.20.9.6.202608260604-0 —
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.20:rhcos-x86_64-4.20.9.6.202608260604-0 —
Vendor Fix fix
Workaround
Threats
Impact Important
References
Acknowledgments
Red Hat Pavel Valena
To clipboard 

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  "vulnerabilities": [
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          ],
          "organization": "Red Hat",
          "summary": "This issue was discovered by Red Hat."
        }
      ],
      "cve": "CVE-2026-15816",
      "cwe": {
        "id": "CWE-78",
        "name": "Improper Neutralization of Special Elements used in an OS Command (\u0027OS Command Injection\u0027)"
      },
      "discovery_date": "2026-06-10T19:21:21+00:00",
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          "text": "2500889"
        }
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      "notes": [
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          "category": "description",
          "text": "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.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "dracut: dracut: root code execution via unescaped error message written to sourced emergency hook script in die()",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "Red Hat Product Security rates this flaw\u0027s impact as Important. Exploitation requires an attacker-controlled or spoofed DHCP server on the same network segment as a system performing network boot (root=dhcp/netroot=dhcp), and for the DHCP-supplied ROOT_PATH value to fail dracut\u0027s netroot handler resolution -- both fully within an adjacent-network attacker\u0027s control. Reaching the point where the poisoned hook script is actually sourced depends on dracut\u0027s boot-failure handling reinvoking the emergency shell mechanism, which occurs by default when the netroot handler cannot be resolved. This is a separate code path from CVE-2026-6893, which patched modules.d/35network-legacy/dhclient-script.sh but did not modify dracut-lib.sh\u0027s die() function. Systems that do not perform network/PXE boot, or that do not rely on DHCP-supplied ROOT_PATH values, are not exposed to this issue.",
          "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"
        }
      ],
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          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-15816"
        },
        {
          "category": "external",
          "summary": "RHBZ#2500889",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2500889"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-15816",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-15816"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-15816",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-15816"
        },
        {
          "category": "external",
          "summary": "https://bugzilla.redhat.com/show_bug.cgi?id=2459963",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2459963"
        },
        {
          "category": "external",
          "summary": "https://github.com/dracutdevs/dracut/blob/master/modules.d/40network/netroot.sh",
          "url": "https://github.com/dracutdevs/dracut/blob/master/modules.d/40network/netroot.sh"
        },
        {
          "category": "external",
          "summary": "https://github.com/dracutdevs/dracut/blob/master/modules.d/99base/dracut-lib.sh",
          "url": "https://github.com/dracutdevs/dracut/blob/master/modules.d/99base/dracut-lib.sh"
        }
      ],
      "release_date": "2026-08-05T23:59:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-09-01T21:46:51+00:00",
          "details": "For OpenShift Container Platform 4.20 see the following documentation,\nwhich will be updated shortly for this release, for important instructions\non how to upgrade your cluster and fully apply this asynchronous errata\nupdate:\n\nhttps://docs.redhat.com/en/documentation/openshift_container_platform/4.20/html/release_notes/\n\nYou may download the oc tool and use it to inspect release image metadata\nfor x86_64, s390x, ppc64le, and aarch64 architectures. The image digests\nmay be found at\nhttps://quay.io/repository/openshift-release-dev/ocp-release?tab=tags.\n\nThe sha values for the release are as follows:\n\n      (For x86_64 architecture)\n      The image digest is\nsha256:8fcb7da94ab599d7aa92adfcffdcda19cef1f3c2903bc9d38006b7522847c458\n\n      (For s390x architecture)\n      The image digest is\nsha256:7d2df00be06a79cd70639c116c4998f8540b3e379cef1e2cf0f3ddff5188c00c\n\n      (For ppc64le architecture)\n      The image digest is\nsha256:e41c3fa52e30b8c9d0c3a5ea531f082c08c7f8832123b76d597b198726a0f6f1\n\n      (For aarch64 architecture)\n      The image digest is\nsha256:2d6b342b1c77355a7c02d990ebf3e28d31aebe9c78a4bccd8ea07fbebc5a0c49\n\nAll OpenShift Container Platform 4.20 users are advised to upgrade to these\nupdated packages and images when they are available in the appropriate\nrelease channel. To check for available updates, use the OpenShift CLI (oc)\nor web console. Instructions for upgrading a cluster are available at\nhttps://docs.redhat.com/en/documentation/openshift_container_platform/4.20/html-single/updating_clusters/index#updating-cluster-cli.",
          "product_ids": [
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            "9Base-RHOSE-4.20:rhcos-s390x-4.20.9.6.202608260604-0",
            "9Base-RHOSE-4.20:rhcos-x86_64-4.20.9.6.202608260604-0"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:60445"
        },
        {
          "category": "workaround",
          "details": "Restrict DHCP server access on networks used for network boot (DHCP snooping, dedicated/trusted provisioning VLANs) until a fix is available.",
          "product_ids": [
            "9Base-RHOSE-4.20:rhcos-aarch64-4.20.9.6.202608260604-0",
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            "9Base-RHOSE-4.20:rhcos-s390x-4.20.9.6.202608260604-0",
            "9Base-RHOSE-4.20:rhcos-x86_64-4.20.9.6.202608260604-0"
          ]
        }
      ],
      "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": [
            "9Base-RHOSE-4.20:rhcos-aarch64-4.20.9.6.202608260604-0",
            "9Base-RHOSE-4.20:rhcos-ppc64le-4.20.9.6.202608260604-0",
            "9Base-RHOSE-4.20:rhcos-s390x-4.20.9.6.202608260604-0",
            "9Base-RHOSE-4.20:rhcos-x86_64-4.20.9.6.202608260604-0"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "dracut: dracut: root code execution via unescaped error message written to sourced emergency hook script in die()"
    }
  ]
}



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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

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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.