RHSA-2026:51422
Vulnerability from csaf_redhat - Published: 2026-08-12 00:24 - Updated: 2026-08-21 12:21Summary
Red Hat Security Advisory: Red Hat build of MicroShift 4.19.42 security update
Severity
Important
Notes
Topic: Red Hat build of MicroShift release 4.19.42 is now available with updates
to packages and images that include a security update.
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 build of MicroShift is Red Hat's light-weight Kubernetes
orchestration solution designed for edge device deployments and is built
from the edge capabilities of Red Hat OpenShift Container Platform.
MicroShift is an application that is deployed on top of Red Hat Enterprise
Linux devices at the edge, providing an efficient way to operate
single-node clusters in these low-resource environments.
This advisory contains the RPM packages for Red Hat build of MicroShift
4.19.42. Read the following advisory for the container images for this
release:
https://access.redhat.com/errata/RHSA-2026:51007
Security Fix(es):
* Kubelet: CRI-O: kube-apiserver: Kubelet, CRI-O, kube-apiserver: Denial of
Service via SPDY streaming code (CVE-2026-35469)
All Red Hat build of MicroShift 4.19 users are advised to use these updated
packages and images when they are available in the RPM repository.
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.
A flaw was found in the SPDY streaming code used by Kubelet, CRI-O, and kube-apiserver. An attacker with specific cluster roles, such as those allowing access to pod port forwarding, execution, or attachment, or node proxying, could exploit this vulnerability. This could lead to a Denial of Service (DoS) by causing the affected components to become unresponsive.
6.5 (Medium)
Affected products
Fixed
21 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: 9Base-RHOSE-4.19:microshift-0:4.19.42-202608062155.p0.g46c9d67.assembly.4.19.42.el9.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 9Base-RHOSE-4.19:microshift-0:4.19.42-202608062155.p0.g46c9d67.assembly.4.19.42.el9.src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 9Base-RHOSE-4.19:microshift-0:4.19.42-202608062155.p0.g46c9d67.assembly.4.19.42.el9.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 9Base-RHOSE-4.19:microshift-ai-model-serving-0:4.19.42-202608062155.p0.g46c9d67.assembly.4.19.42.el9.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 9Base-RHOSE-4.19:microshift-ai-model-serving-release-info-0:4.19.42-202608062155.p0.g46c9d67.assembly.4.19.42.el9.noarch | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 9Base-RHOSE-4.19:microshift-gateway-api-0:4.19.42-202608062155.p0.g46c9d67.assembly.4.19.42.el9.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 9Base-RHOSE-4.19:microshift-gateway-api-0:4.19.42-202608062155.p0.g46c9d67.assembly.4.19.42.el9.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 9Base-RHOSE-4.19:microshift-gateway-api-release-info-0:4.19.42-202608062155.p0.g46c9d67.assembly.4.19.42.el9.noarch | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 9Base-RHOSE-4.19:microshift-greenboot-0:4.19.42-202608062155.p0.g46c9d67.assembly.4.19.42.el9.noarch | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 9Base-RHOSE-4.19:microshift-low-latency-0:4.19.42-202608062155.p0.g46c9d67.assembly.4.19.42.el9.noarch | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 9Base-RHOSE-4.19:microshift-multus-0:4.19.42-202608062155.p0.g46c9d67.assembly.4.19.42.el9.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 9Base-RHOSE-4.19:microshift-multus-0:4.19.42-202608062155.p0.g46c9d67.assembly.4.19.42.el9.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 9Base-RHOSE-4.19:microshift-multus-release-info-0:4.19.42-202608062155.p0.g46c9d67.assembly.4.19.42.el9.noarch | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 9Base-RHOSE-4.19:microshift-networking-0:4.19.42-202608062155.p0.g46c9d67.assembly.4.19.42.el9.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 9Base-RHOSE-4.19:microshift-networking-0:4.19.42-202608062155.p0.g46c9d67.assembly.4.19.42.el9.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 9Base-RHOSE-4.19:microshift-observability-0:4.19.42-202608062155.p0.g46c9d67.assembly.4.19.42.el9.noarch | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 9Base-RHOSE-4.19:microshift-olm-0:4.19.42-202608062155.p0.g46c9d67.assembly.4.19.42.el9.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 9Base-RHOSE-4.19:microshift-olm-0:4.19.42-202608062155.p0.g46c9d67.assembly.4.19.42.el9.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 9Base-RHOSE-4.19:microshift-olm-release-info-0:4.19.42-202608062155.p0.g46c9d67.assembly.4.19.42.el9.noarch | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 9Base-RHOSE-4.19:microshift-release-info-0:4.19.42-202608062155.p0.g46c9d67.assembly.4.19.42.el9.noarch | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 9Base-RHOSE-4.19:microshift-selinux-0:4.19.42-202608062155.p0.g46c9d67.assembly.4.19.42.el9.noarch | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Important
References
8 references
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"text": "A flaw was found in the SPDY streaming code used by Kubelet, CRI-O, and kube-apiserver. An attacker with specific cluster roles, such as those allowing access to pod port forwarding, execution, or attachment, or node proxying, could exploit this vulnerability. This could lead to a Denial of Service (DoS) by causing the affected components to become unresponsive.",
"title": "Vulnerability description"
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"category": "summary",
"text": "Kubelet: CRI-O: kube-apiserver: Kubelet, CRI-O, kube-apiserver: Denial of Service via SPDY streaming code",
"title": "Vulnerability summary"
},
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"category": "other",
"text": "This is an Important denial of service flaw affecting OpenShift Container Platform. An attacker with specific elevated cluster roles, such as those permitting pod port forwarding, execution, attachment, or node proxying, could exploit a vulnerability in the SPDY streaming code of Kubelet, CRI-O, and kube-apiserver, leading to unresponsiveness of these critical components.",
"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-2026-35469"
},
{
"category": "external",
"summary": "RHBZ#2457729",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2457729"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-35469",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-35469"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-35469",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-35469"
}
],
"release_date": "2026-04-13T23:59:59+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-08-12T00:24:02+00:00",
"details": "For MicroShift 4.19, read the following documentation for important\ninstructions on how to install the latest RPMs and fully apply this\nasynchronous errata update:\n\nhttps://docs.redhat.com/en/documentation/red_hat_build_of_microshift/4.19/html/red_hat_build_of_microshift_release_notes/index",
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],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:51422"
},
{
"category": "workaround",
"details": "To mitigate this issue, review and restrict the assignment of Kubernetes cluster roles `pods/portforward (create)`, `pods/exec (create)`, `pods/attach (create)`, and `nodes/proxy (get/create)` to untrusted users or service accounts. Ensure that only authorized and necessary entities possess these permissions. Modifying RBAC policies can impact the functionality of applications and services that rely on these permissions; careful testing is recommended.",
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],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
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],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "Kubelet: CRI-O: kube-apiserver: Kubelet, CRI-O, kube-apiserver: Denial of Service via SPDY streaming code"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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