RHSA-2026:20866
Vulnerability from csaf_redhat - Published: 2026-05-26 11:28 - Updated: 2026-09-09 15:40A flaw was found in KubeVirt's virt-handler component. This vulnerability allows an authenticated OpenShift user with edit permissions in a single namespace to exploit improper symlink validation when connecting to virtual machine console sockets. By replacing the console socket with a symlink to the host's container runtime (CRI-O) socket, an attacker can hijack virt-handler's privileged connection. This enables the attacker to access any Unix socket on the host, potentially leading to full control of the node and the entire cluster.
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Red Hat Container Native Virtualization 4.15:registry.redhat.io/container-native-virtualization/virt-handler-rhel9@sha256:150e16ca964b4afd80b41d0ec2f3551e31ed6f18e07aaa91b49c39312a10c799_arm64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Container Native Virtualization 4.15:registry.redhat.io/container-native-virtualization/virt-handler-rhel9@sha256:745e83f3037d1720236942e6afc46c2c8bd2e4cd12b1401ae49ef551acfa18fa_amd64 | — |
Vendor Fix
fix
Workaround
|
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Red Hat Container Native Virtualization 4.15:registry.redhat.io/container-native-virtualization/libguestfs-tools-rhel9@sha256:69e3be623e1a2a8dd2c601a36e06ac0614760cef133b1041209802766ce84244_amd64 | — |
Workaround
|
|
| Unresolved product id: Red Hat Container Native Virtualization 4.15:registry.redhat.io/container-native-virtualization/libguestfs-tools-rhel9@sha256:c21abdaa83c34b79b8ad84927844c1b3d66063e883924aab9104e21153d3f3b1_arm64 | — |
Workaround
|
|
| Unresolved product id: Red Hat Container Native Virtualization 4.15:registry.redhat.io/container-native-virtualization/pr-helper-rhel9@sha256:494e7ad93a6750731662684e6057c330f65b9b9d5904bf359e9cb90419c175dd_arm64 | — |
Workaround
|
|
| Unresolved product id: Red Hat Container Native Virtualization 4.15:registry.redhat.io/container-native-virtualization/pr-helper-rhel9@sha256:db054ea430cddd12d2a8760a5d7ab2878026891c777f1be6fb682915d4a8539e_amd64 | — |
Workaround
|
|
| Unresolved product id: Red Hat Container Native Virtualization 4.15:registry.redhat.io/container-native-virtualization/virt-api-rhel9@sha256:0b817bd92fed9f13dc995590b33c245a0031f8a7a3fc0cfe868b5174ef6e48ff_amd64 | — |
Workaround
|
|
| Unresolved product id: Red Hat Container Native Virtualization 4.15:registry.redhat.io/container-native-virtualization/virt-api-rhel9@sha256:98c1ab049b34fe94978dbe48c673f6bdc3fd5f3cb7c02479b8e99df26663cadc_arm64 | — |
Workaround
|
|
| Unresolved product id: Red Hat Container Native Virtualization 4.15:registry.redhat.io/container-native-virtualization/virt-artifacts-server-rhel9@sha256:5883055be1ec5976a064eab6864f777d32676dfee75f514418d124f19c591048_amd64 | — |
Workaround
|
|
| Unresolved product id: Red Hat Container Native Virtualization 4.15:registry.redhat.io/container-native-virtualization/virt-artifacts-server-rhel9@sha256:a7829e988a31412b3dc58bbd9fca49dac9dbb916462809878a630927bd198deb_arm64 | — |
Workaround
|
|
| Unresolved product id: Red Hat Container Native Virtualization 4.15:registry.redhat.io/container-native-virtualization/virt-controller-rhel9@sha256:c0a812723505511c50b8c1bfb2eb22633b36ae3129dd0957ae2d3ae3c2498d64_arm64 | — |
Workaround
|
|
| Unresolved product id: Red Hat Container Native Virtualization 4.15:registry.redhat.io/container-native-virtualization/virt-controller-rhel9@sha256:ec7da083282a4c9465529139a5cfe29c456e7caff7187ba9f027c936b16528f7_amd64 | — |
Workaround
|
|
| Unresolved product id: Red Hat Container Native Virtualization 4.15:registry.redhat.io/container-native-virtualization/virt-exportproxy-rhel9@sha256:9d50595d4a3cf8c53ccc50a6b52a0d325a292f155b494fe0637e5a090d664f5f_arm64 | — |
Workaround
|
|
| Unresolved product id: Red Hat Container Native Virtualization 4.15:registry.redhat.io/container-native-virtualization/virt-exportproxy-rhel9@sha256:b5aa3a6bb65703b77755dccbaa01bee659ab75bbfcf521b6d5d5bd79ae274d96_amd64 | — |
Workaround
|
|
| Unresolved product id: Red Hat Container Native Virtualization 4.15:registry.redhat.io/container-native-virtualization/virt-exportserver-rhel9@sha256:8eaa2bb71213b75886fcfd256f94ef0b0df2094dbdd6bce298f895724cc33fcb_amd64 | — |
Workaround
|
|
| Unresolved product id: Red Hat Container Native Virtualization 4.15:registry.redhat.io/container-native-virtualization/virt-exportserver-rhel9@sha256:c8eb889b2f8016bad49610a9ef83e6577bdbe389c59824182756b83c95c40ad3_arm64 | — |
Workaround
|
|
| Unresolved product id: Red Hat Container Native Virtualization 4.15:registry.redhat.io/container-native-virtualization/virt-launcher-rhel9@sha256:08f8ece3d5fbfbe9ea25b5d71046db1ec6268d3cc1901f511780bc01479c0fa6_arm64 | — |
Workaround
|
|
| Unresolved product id: Red Hat Container Native Virtualization 4.15:registry.redhat.io/container-native-virtualization/virt-launcher-rhel9@sha256:636bff27785b58e38b31ca3fa7d07a1a58f8537e9d72600e05a073a1e9131fb0_amd64 | — |
Workaround
|
|
| Unresolved product id: Red Hat Container Native Virtualization 4.15:registry.redhat.io/container-native-virtualization/virt-operator-rhel9@sha256:0a78119c30f8ffdf86f23d8e0c544450d19bbfe01029c52e7e4c5a978e0ab441_amd64 | — |
Workaround
|
|
| Unresolved product id: Red Hat Container Native Virtualization 4.15:registry.redhat.io/container-native-virtualization/virt-operator-rhel9@sha256:ba29973c2c9343e725fc82d84b44b258c7b95ba78ff84b9fbe3132cdbdf4e34e_arm64 | — |
Workaround
|
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],
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"summary": "This issue was discovered by Red Hat."
}
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"name": "Improper Link Resolution Before File Access (\u0027Link Following\u0027)"
},
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"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2463728"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in KubeVirt\u0027s virt-handler component. This vulnerability allows an authenticated OpenShift user with edit permissions in a single namespace to exploit improper symlink validation when connecting to virtual machine console sockets. By replacing the console socket with a symlink to the host\u0027s container runtime (CRI-O) socket, an attacker can hijack virt-handler\u0027s privileged connection. This enables the attacker to access any Unix socket on the host, potentially leading to full control of the node and the entire cluster.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kubevirt: KubeVirt virt-handler: Privilege escalation and node compromise via symlink following vulnerability",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This is an Important privilege escalation flaw in KubeVirt\u0027s virt-handler component. An authenticated OpenShift user with edit permissions in a single namespace can exploit improper symlink validation to hijack virt-handler\u0027s privileged connection. This allows access to any Unix socket on the host, leading to potential full control of the node and the entire cluster.",
"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-2026-7374"
},
{
"category": "external",
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"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2463728"
},
{
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"url": "https://www.cve.org/CVERecord?id=CVE-2026-7374"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-7374",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-7374"
}
],
"release_date": "2026-05-26T12:30:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-05-26T11:28:00+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",
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"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 9.9,
"baseSeverity": "CRITICAL",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
"version": "3.1"
},
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"Red Hat Container Native Virtualization 4.15:registry.redhat.io/container-native-virtualization/virt-handler-rhel9@sha256:745e83f3037d1720236942e6afc46c2c8bd2e4cd12b1401ae49ef551acfa18fa_amd64",
"Red Hat Container Native Virtualization 4.15:registry.redhat.io/container-native-virtualization/virt-launcher-rhel9@sha256:08f8ece3d5fbfbe9ea25b5d71046db1ec6268d3cc1901f511780bc01479c0fa6_arm64",
"Red Hat Container Native Virtualization 4.15:registry.redhat.io/container-native-virtualization/virt-launcher-rhel9@sha256:636bff27785b58e38b31ca3fa7d07a1a58f8537e9d72600e05a073a1e9131fb0_amd64",
"Red Hat Container Native Virtualization 4.15:registry.redhat.io/container-native-virtualization/virt-operator-rhel9@sha256:0a78119c30f8ffdf86f23d8e0c544450d19bbfe01029c52e7e4c5a978e0ab441_amd64",
"Red Hat Container Native Virtualization 4.15:registry.redhat.io/container-native-virtualization/virt-operator-rhel9@sha256:ba29973c2c9343e725fc82d84b44b258c7b95ba78ff84b9fbe3132cdbdf4e34e_arm64"
]
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "kubevirt: KubeVirt virt-handler: Privilege escalation and node compromise via symlink following vulnerability"
}
]
}
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.
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.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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.