RHSA-2026:5877
Vulnerability from csaf_redhat - Published: 2026-04-01 10:06 - Updated: 2026-04-01 13:34Summary
Red Hat Security Advisory: OpenShift Container Platform 4.19.27 bug fix and security update
Severity
Moderate
Notes
Topic: Red Hat OpenShift Container Platform release 4.19.27 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 4.19.
Red Hat Product Security has rated this update as having a security impact
of Moderate. 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 4.19.27. See the following advisory for the RPM packages for this
release:
https://access.redhat.com/errata/RHSA-2026:5876
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/4.19/html/release_notes/
Security Fix(es):
* nfs-utils: rpc.mountd in the nfs-utils privilege escalation
(CVE-2025-12801)
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 4.19 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/4.19/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.
A vulnerability was recently discovered in the rpc.mountd daemon in the nfs-utils package for Linux, that allows a NFSv3 client to escalate the privileges assigned to it in the /etc/exports file at mount time. In particular, it allows the client to access any subdirectory or subtree of an exported directory, regardless of the set file permissions, and regardless of any 'root_squash' or 'all_squash' attributes that would normally be expected to apply to that client.
6.5 (Medium)
Vendor Fix
For OpenShift Container Platform 4.19 see the following documentation,
which will be updated shortly for this release, for important instructions
on how to upgrade your cluster and fully apply this asynchronous errata
update:
https://docs.redhat.com/en/documentation/openshift_container_platform/4.19/html/release_notes/
You may download the oc tool and use it to inspect release image metadata
for x86_64, s390x, ppc64le, and aarch64 architectures. The image digests
may be found at
https://quay.io/repository/openshift-release-dev/ocp-release?tab=tags.
The sha values for the release are as follows:
(For x86_64 architecture)
The image digest is sha256:67559510d25d5024c374d67104b99d88f83746f615fa8232ae778d9e7fec14f8
(For s390x architecture)
The image digest is sha256:2d527273c5a7077d815a2a67e7970ea3dedfe13bb4f973eaaf75fb8cc2166235
(For ppc64le architecture)
The image digest is sha256:d82500c7d65c17524bea939caf23104b28965311110305220943e131d1797b35
(For aarch64 architecture)
The image digest is sha256:434c8a014b3a5c1e936a0aab41cf907048fc6eca75e49a4e78c2b931deedb1cf
All OpenShift Container Platform 4.19 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/4.19/html-single/updating_clusters/index#updating-cluster-cli.
https://access.redhat.com/errata/RHSA-2026:5877
Workaround
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
References
Acknowledgments
Simon Hall
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"text": "A vulnerability was recently discovered in the rpc.mountd daemon in the nfs-utils package for Linux, that allows a NFSv3 client to escalate the\nprivileges assigned to it in the /etc/exports file at mount time. In particular, it allows the client to access any subdirectory or subtree of an exported directory, regardless of the set file permissions, and regardless of any \u0027root_squash\u0027 or \u0027all_squash\u0027 attributes that would normally be expected to apply to that client.",
"title": "Vulnerability description"
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"text": "nfs-utils: rpc.mountd in the nfs-utils privilege escalation",
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"text": "This MODERATE impact vulnerability in `rpc.mountd` within the `nfs-utils` package allows an authenticated NFSv3 client to bypass configured `root_squash` or `all_squash` restrictions. This enables the client to access subdirectories of an exported NFS share with elevated privileges, regardless of the intended file permissions. Red Hat Enterprise Linux systems configured as NFSv3 servers are affected.",
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{
"category": "vendor_fix",
"date": "2026-04-01T10:06:58+00:00",
"details": "For OpenShift Container Platform 4.19 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/4.19/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 sha256:67559510d25d5024c374d67104b99d88f83746f615fa8232ae778d9e7fec14f8\n\n (For s390x architecture)\n The image digest is sha256:2d527273c5a7077d815a2a67e7970ea3dedfe13bb4f973eaaf75fb8cc2166235\n\n (For ppc64le architecture)\n The image digest is sha256:d82500c7d65c17524bea939caf23104b28965311110305220943e131d1797b35\n\n (For aarch64 architecture)\n The image digest is sha256:434c8a014b3a5c1e936a0aab41cf907048fc6eca75e49a4e78c2b931deedb1cf\n\nAll OpenShift Container Platform 4.19 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/4.19/html-single/updating_clusters/index#updating-cluster-cli.",
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"url": "https://access.redhat.com/errata/RHSA-2026:5877"
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"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
"version": "3.1"
},
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]
}
],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "nfs-utils: rpc.mountd in the nfs-utils privilege escalation"
}
]
}
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Sightings
| Author | Source | Type | Date |
|---|
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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