RHSA-2026:73397

Vulnerability from csaf_redhat - Published: 2026-09-29 12:09 - Updated: 2026-10-06 11:50
Summary
Red Hat Security Advisory: OpenShift Virtualization v4.21 Images
Severity
Important
Notes
Topic: Red Hat OpenShift Virtualization release v4.21 is now available with updates to packages and images that fix several bugs and add enhancements.
Details: OpenShift Virtualization is Red Hat's virtualization solution designed for Red Hat OpenShift Container Platform. This advisory contains OpenShift Virtualization v4.21 images.
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-2026-56862

A flaw was found in the `crypto/tls` package, part of `golang`. A malicious client can exploit this vulnerability by continuously sending KeyUpdate messages to a server. This forces the server to perform indefinite key derivation operations, leading to resource exhaustion and a Denial of Service (DoS) condition.

7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-1050 - Excessive Platform Resource Consumption within a Loop
Affected products
Product Identifier Version Remediation
Unresolved product id: Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/kubemacpool-rhel9@sha256:982b9aec3faa646fcf18dbf521f1814fc909e584d15e865b3df3089aff8b1501_s390x —
Vendor Fix fix
Unresolved product id: Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/kubemacpool-rhel9@sha256:dbe9215a744d911a4d45c2e45d21b1e09d32ec809d729182f699f3cf39687587_amd64 —
Vendor Fix fix
Unresolved product id: Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/kubemacpool-rhel9@sha256:fcf8be6ff73c2a3444ec5fa38ed142a5b36c89140f725d7aa94d2187990cb1e7_arm64 —
Vendor Fix fix
Product Identifier Version Remediation
Unresolved product id: Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/bridge-marker-rhel9@sha256:53b0007c2468380938dcc197a31435d4fe62dcab83e9c6ec1ab603a030873d56_amd64 —
Unresolved product id: Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/bridge-marker-rhel9@sha256:c6ed929b0fc7f32d746ec37459a23b7832990057cf62bf5f5470f5158a223cca_s390x —
Unresolved product id: Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/bridge-marker-rhel9@sha256:ddaea74df89b7979476692b56e0e4c2fd8ccc863230f7bcbdf4d07b96aeab0be_arm64 —
Unresolved product id: Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/cluster-network-addons-operator-rhel9@sha256:2073ffa8c97086785894665797c8bc94d149f32f2e11e8af2719c9ee1c249622_s390x —
Unresolved product id: Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/cluster-network-addons-operator-rhel9@sha256:64863f8da910eb41953ab82d8864a5551e6ef3c8221a454daca4d155c65e7190_arm64 —
Unresolved product id: Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/cluster-network-addons-operator-rhel9@sha256:87e757c9a01bdb7825f95eec2f1933183f5dc54c0d6a551565e7c25f2fee2ec9_amd64 —
Unresolved product id: Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/cnv-containernetworking-plugins-rhel9@sha256:369d1c0a1e189cfaf6e9634f04b5be98655bf334d23c46f606d863e9a1c32bd6_s390x —
Unresolved product id: Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/cnv-containernetworking-plugins-rhel9@sha256:9389fb4ff3ddfc59846aa721c95a3cc15b27ce2c01e7c0a976188d16d909728c_amd64 —
Unresolved product id: Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/cnv-containernetworking-plugins-rhel9@sha256:e0bb6fbc313f49639e6e32f07163c9f211e3f74059cef17dcab718a3cdb776af_arm64 —
Unresolved product id: Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/kubesecondarydns-rhel9@sha256:0b49b006b038aafaa3f6b4302a536d0666fc37be15612b47f1adf89b7ce75d39_amd64 —
Unresolved product id: Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/kubesecondarydns-rhel9@sha256:3779fca62a49bb64a0f2b7a44c2292afac502c5fa4877df93ba22c82dd7d73a3_s390x —
Unresolved product id: Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/kubesecondarydns-rhel9@sha256:89e57dc6b47d591bce32a1e5c03e1ceaae0a0e25fb396953bf345fc7f4b5b9c7_arm64 —
Unresolved product id: Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/kubevirt-ipam-controller-rhel9@sha256:03f0e9d3d02f63388bf2b2d3050ccd2826324c0db87f6720d6bc314323b3a136_arm64 —
Unresolved product id: Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/kubevirt-ipam-controller-rhel9@sha256:186f872645cf1eb5ad2c39d31a28dbe675b665043707e942aba8389204d823ab_amd64 —
Unresolved product id: Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/kubevirt-ipam-controller-rhel9@sha256:ada570ff23003ca636d7adf1ac8cadc8367a5e0a7537ea3799930baa13a4f601_s390x —
Unresolved product id: Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/multus-dynamic-networks-rhel9@sha256:2be26e35203e96c6fb6a9b4912cb7192c3463d031e5cba417d6850b2f68baa52_amd64 —
Unresolved product id: Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/multus-dynamic-networks-rhel9@sha256:a2ea25f053c44b00d2a426371f17f5e0155d47aa36aca6342684552a0510f81a_arm64 —
Unresolved product id: Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/multus-dynamic-networks-rhel9@sha256:dfddff25f11324500c0c2c9e64dcce9a4b33da6a55cd9d325bc9546de1ccad94_s390x —
Unresolved product id: Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/ovs-cni-plugin-rhel9@sha256:3349d05b16d2a6010840027f70b02439364b3819563a4ba176ebb317843ed261_s390x —
Unresolved product id: Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/ovs-cni-plugin-rhel9@sha256:706ddd31a784fe56bc1589e1cd144cec3d0d0fb2d47d3a681efe0e2cf58e3a57_arm64 —
Unresolved product id: Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/ovs-cni-plugin-rhel9@sha256:e242125a4c3088ba055fe329943a0b2e244316200c30b50939a6ae3daef29495_amd64 —
Threats
Impact Important
References
To clipboard 

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          "text": "A flaw was found in the `crypto/tls` package, part of `golang`. A malicious client can exploit this vulnerability by continuously sending KeyUpdate messages to a server. This forces the server to perform indefinite key derivation operations, leading to resource exhaustion and a Denial of Service (DoS) condition.",
          "title": "Vulnerability description"
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          "text": "crypto/tls: golang: Golang crypto/tls: Denial of Service via indefinite KeyUpdate messages",
          "title": "Vulnerability summary"
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          "category": "other",
          "text": "This is an Important denial of service vulnerability in the `golang` `crypto/tls` package. A remote, unauthenticated attacker can exploit this flaw by continuously sending `KeyUpdate` messages during a TLS handshake, forcing the server to perform indefinite key derivation operations. This resource exhaustion can lead to a denial of service for applications and services in Red Hat products that use the affected `crypto/tls` library and are exposed to untrusted network clients.",
          "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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          "Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/bridge-marker-rhel9@sha256:c6ed929b0fc7f32d746ec37459a23b7832990057cf62bf5f5470f5158a223cca_s390x",
          "Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/bridge-marker-rhel9@sha256:ddaea74df89b7979476692b56e0e4c2fd8ccc863230f7bcbdf4d07b96aeab0be_arm64",
          "Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/cluster-network-addons-operator-rhel9@sha256:2073ffa8c97086785894665797c8bc94d149f32f2e11e8af2719c9ee1c249622_s390x",
          "Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/cluster-network-addons-operator-rhel9@sha256:64863f8da910eb41953ab82d8864a5551e6ef3c8221a454daca4d155c65e7190_arm64",
          "Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/cluster-network-addons-operator-rhel9@sha256:87e757c9a01bdb7825f95eec2f1933183f5dc54c0d6a551565e7c25f2fee2ec9_amd64",
          "Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/cnv-containernetworking-plugins-rhel9@sha256:369d1c0a1e189cfaf6e9634f04b5be98655bf334d23c46f606d863e9a1c32bd6_s390x",
          "Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/cnv-containernetworking-plugins-rhel9@sha256:9389fb4ff3ddfc59846aa721c95a3cc15b27ce2c01e7c0a976188d16d909728c_amd64",
          "Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/cnv-containernetworking-plugins-rhel9@sha256:e0bb6fbc313f49639e6e32f07163c9f211e3f74059cef17dcab718a3cdb776af_arm64",
          "Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/kubesecondarydns-rhel9@sha256:0b49b006b038aafaa3f6b4302a536d0666fc37be15612b47f1adf89b7ce75d39_amd64",
          "Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/kubesecondarydns-rhel9@sha256:3779fca62a49bb64a0f2b7a44c2292afac502c5fa4877df93ba22c82dd7d73a3_s390x",
          "Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/kubesecondarydns-rhel9@sha256:89e57dc6b47d591bce32a1e5c03e1ceaae0a0e25fb396953bf345fc7f4b5b9c7_arm64",
          "Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/kubevirt-ipam-controller-rhel9@sha256:03f0e9d3d02f63388bf2b2d3050ccd2826324c0db87f6720d6bc314323b3a136_arm64",
          "Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/kubevirt-ipam-controller-rhel9@sha256:186f872645cf1eb5ad2c39d31a28dbe675b665043707e942aba8389204d823ab_amd64",
          "Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/kubevirt-ipam-controller-rhel9@sha256:ada570ff23003ca636d7adf1ac8cadc8367a5e0a7537ea3799930baa13a4f601_s390x",
          "Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/multus-dynamic-networks-rhel9@sha256:2be26e35203e96c6fb6a9b4912cb7192c3463d031e5cba417d6850b2f68baa52_amd64",
          "Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/multus-dynamic-networks-rhel9@sha256:a2ea25f053c44b00d2a426371f17f5e0155d47aa36aca6342684552a0510f81a_arm64",
          "Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/multus-dynamic-networks-rhel9@sha256:dfddff25f11324500c0c2c9e64dcce9a4b33da6a55cd9d325bc9546de1ccad94_s390x",
          "Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/ovs-cni-plugin-rhel9@sha256:3349d05b16d2a6010840027f70b02439364b3819563a4ba176ebb317843ed261_s390x",
          "Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/ovs-cni-plugin-rhel9@sha256:706ddd31a784fe56bc1589e1cd144cec3d0d0fb2d47d3a681efe0e2cf58e3a57_arm64",
          "Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/ovs-cni-plugin-rhel9@sha256:e242125a4c3088ba055fe329943a0b2e244316200c30b50939a6ae3daef29495_amd64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-56862"
        },
        {
          "category": "external",
          "summary": "RHBZ#2515839",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2515839"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-56862",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-56862"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-56862",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-56862"
        },
        {
          "category": "external",
          "summary": "https://go.dev/cl/804261",
          "url": "https://go.dev/cl/804261"
        },
        {
          "category": "external",
          "summary": "https://go.dev/issue/80528",
          "url": "https://go.dev/issue/80528"
        },
        {
          "category": "external",
          "summary": "https://groups.google.com/g/golang-announce/c/94pEornpRlI",
          "url": "https://groups.google.com/g/golang-announce/c/94pEornpRlI"
        },
        {
          "category": "external",
          "summary": "https://pkg.go.dev/vuln/GO-2026-6090",
          "url": "https://pkg.go.dev/vuln/GO-2026-6090"
        }
      ],
      "release_date": "2026-08-13T21:58:53.216000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-09-29T12:09:22+00:00",
          "details": "Before applying this update, make sure all previously released errata relevant to your system have been applied.\n\nFor details on how to apply this update, refer to:\n\nhttps://access.redhat.com/articles/11258",
          "product_ids": [
            "Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/kubemacpool-rhel9@sha256:982b9aec3faa646fcf18dbf521f1814fc909e584d15e865b3df3089aff8b1501_s390x",
            "Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/kubemacpool-rhel9@sha256:dbe9215a744d911a4d45c2e45d21b1e09d32ec809d729182f699f3cf39687587_amd64",
            "Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/kubemacpool-rhel9@sha256:fcf8be6ff73c2a3444ec5fa38ed142a5b36c89140f725d7aa94d2187990cb1e7_arm64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:73397"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
            "Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/bridge-marker-rhel9@sha256:53b0007c2468380938dcc197a31435d4fe62dcab83e9c6ec1ab603a030873d56_amd64",
            "Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/bridge-marker-rhel9@sha256:c6ed929b0fc7f32d746ec37459a23b7832990057cf62bf5f5470f5158a223cca_s390x",
            "Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/bridge-marker-rhel9@sha256:ddaea74df89b7979476692b56e0e4c2fd8ccc863230f7bcbdf4d07b96aeab0be_arm64",
            "Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/cluster-network-addons-operator-rhel9@sha256:2073ffa8c97086785894665797c8bc94d149f32f2e11e8af2719c9ee1c249622_s390x",
            "Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/cluster-network-addons-operator-rhel9@sha256:64863f8da910eb41953ab82d8864a5551e6ef3c8221a454daca4d155c65e7190_arm64",
            "Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/cluster-network-addons-operator-rhel9@sha256:87e757c9a01bdb7825f95eec2f1933183f5dc54c0d6a551565e7c25f2fee2ec9_amd64",
            "Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/cnv-containernetworking-plugins-rhel9@sha256:369d1c0a1e189cfaf6e9634f04b5be98655bf334d23c46f606d863e9a1c32bd6_s390x",
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            "Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/kubesecondarydns-rhel9@sha256:0b49b006b038aafaa3f6b4302a536d0666fc37be15612b47f1adf89b7ce75d39_amd64",
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            "Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/kubevirt-ipam-controller-rhel9@sha256:03f0e9d3d02f63388bf2b2d3050ccd2826324c0db87f6720d6bc314323b3a136_arm64",
            "Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/kubevirt-ipam-controller-rhel9@sha256:186f872645cf1eb5ad2c39d31a28dbe675b665043707e942aba8389204d823ab_amd64",
            "Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/kubevirt-ipam-controller-rhel9@sha256:ada570ff23003ca636d7adf1ac8cadc8367a5e0a7537ea3799930baa13a4f601_s390x",
            "Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/multus-dynamic-networks-rhel9@sha256:2be26e35203e96c6fb6a9b4912cb7192c3463d031e5cba417d6850b2f68baa52_amd64",
            "Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/multus-dynamic-networks-rhel9@sha256:a2ea25f053c44b00d2a426371f17f5e0155d47aa36aca6342684552a0510f81a_arm64",
            "Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/multus-dynamic-networks-rhel9@sha256:dfddff25f11324500c0c2c9e64dcce9a4b33da6a55cd9d325bc9546de1ccad94_s390x",
            "Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/ovs-cni-plugin-rhel9@sha256:3349d05b16d2a6010840027f70b02439364b3819563a4ba176ebb317843ed261_s390x",
            "Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/ovs-cni-plugin-rhel9@sha256:706ddd31a784fe56bc1589e1cd144cec3d0d0fb2d47d3a681efe0e2cf58e3a57_arm64",
            "Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/ovs-cni-plugin-rhel9@sha256:e242125a4c3088ba055fe329943a0b2e244316200c30b50939a6ae3daef29495_amd64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "crypto/tls: golang: Golang crypto/tls: Denial of Service via indefinite KeyUpdate messages"
    }
  ]
}



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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.



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.