RHSA-2026:7884
Vulnerability from csaf_redhat - Published: 2026-04-29 04:16 - Updated: 2026-04-29 22:04Summary
Red Hat Security Advisory: Red Hat OpenStack Services on OpenShift 18.0.18 (openstack-nova) security update
Severity
Important
Notes
Topic: An update for openstack-nova is now available for Red Hat OpenStack
Services on OpenShift 18.0.18 (Antelope).
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: OpenStack Compute (nova) is open source software designed
to provision and manage large networks of virtual machines, creating a
redundant and scalable cloud computing platform. It gives you the software,
control panels, and APIs required to orchestrate a cloud, including running
instances, managing networks, and controlling access through users and
projects. OpenStack Compute strives to be both hardware and hypervisor
agnostic, currently supporting a variety of standard hardware
configurations and seven major hypervisors.
Security Fix(es):
* Arbitrary Host File Overwrite via Unconstrained qemu-img Format Handling in OpenStack Nova (CVE-2026-24708)
For more details about the security issue(s), including the impact, a CVSS
score, acknowledgments, and other related information, refer to the CVE
page listed in the References section.
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 in OpenStack Nova’s interaction with the qemu-img utility allows an authenticated user to overwrite arbitrary files on the compute host. This occurs because Nova invokes qemu-img without strictly constraining the disk image format, enabling a malicious user to craft a QCOW2 header on a raw disk and trigger destructive behavior during instance operations such as resize.
7.1 (High)
Vendor Fix
For details on how to apply this update, which includes the changes
described in this advisory, refer to:
https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2026:7884
Workaround
Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
References
Acknowledgments
RedHat
Dan Smith
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"category": "description",
"text": "A flaw in OpenStack Nova\u2019s interaction with the qemu-img utility allows an authenticated user to overwrite arbitrary files on the compute host. This occurs because Nova invokes qemu-img without strictly constraining the disk image format, enabling a malicious user to craft a QCOW2 header on a raw disk and trigger destructive behavior during instance operations such as resize.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "openstack-nova-compute: Arbitrary Host File Overwrite via Unconstrained qemu-img Format Handling in OpenStack Nova",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This vulnerability is rated Important for Red Hat OpenStack Platform. An authenticated attacker can exploit unconstrained disk format handling in OpenStack Nova when invoking qemu-img. By crafting a QCOW2 header on an ephemeral or root disk, an attacker can cause qemu-img to overwrite arbitrary files on the compute host with Nova\u0027s write access, leading to data destruction or denial of service.",
"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"
}
],
"product_status": {
"fixed": [
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"9Base-RHOSO-18.0:openstack-nova-scheduler-1:27.5.2-18.0.20260312122217.c1c6d67.el9ost.noarch",
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"9Base-RHOSO-18.0:openstack-nova-spicehtml5proxy-1:27.5.2-18.0.20260312122217.c1c6d67.el9ost.noarch",
"9Base-RHOSO-18.0:python3-nova-1:27.5.2-18.0.20260312122217.c1c6d67.el9ost.noarch"
]
},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-24708"
},
{
"category": "external",
"summary": "RHBZ#2430312",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2430312"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-24708",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-24708"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-24708",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-24708"
},
{
"category": "external",
"summary": "https://bugs.launchpad.net/nova/+bug/2137507",
"url": "https://bugs.launchpad.net/nova/+bug/2137507"
}
],
"release_date": "2026-02-17T15:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-04-29T04:16:18+00:00",
"details": "For details on how to apply this update, which includes the changes\ndescribed in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
"product_ids": [
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"9Base-RHOSO-18.0:openstack-nova-1:27.5.2-18.0.20260312122217.c1c6d67.el9ost.src",
"9Base-RHOSO-18.0:openstack-nova-api-1:27.5.2-18.0.20260312122217.c1c6d67.el9ost.noarch",
"9Base-RHOSO-18.0:openstack-nova-common-1:27.5.2-18.0.20260312122217.c1c6d67.el9ost.noarch",
"9Base-RHOSO-18.0:openstack-nova-compute-1:27.5.2-18.0.20260312122217.c1c6d67.el9ost.noarch",
"9Base-RHOSO-18.0:openstack-nova-conductor-1:27.5.2-18.0.20260312122217.c1c6d67.el9ost.noarch",
"9Base-RHOSO-18.0:openstack-nova-migration-1:27.5.2-18.0.20260312122217.c1c6d67.el9ost.noarch",
"9Base-RHOSO-18.0:openstack-nova-novncproxy-1:27.5.2-18.0.20260312122217.c1c6d67.el9ost.noarch",
"9Base-RHOSO-18.0:openstack-nova-scheduler-1:27.5.2-18.0.20260312122217.c1c6d67.el9ost.noarch",
"9Base-RHOSO-18.0:openstack-nova-serialproxy-1:27.5.2-18.0.20260312122217.c1c6d67.el9ost.noarch",
"9Base-RHOSO-18.0:openstack-nova-spicehtml5proxy-1:27.5.2-18.0.20260312122217.c1c6d67.el9ost.noarch",
"9Base-RHOSO-18.0:python3-nova-1:27.5.2-18.0.20260312122217.c1c6d67.el9ost.noarch"
],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:7884"
},
{
"category": "workaround",
"details": "Mitigation for this issue is either not available or the currently available options don\u0027t meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.",
"product_ids": [
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]
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.1,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H",
"version": "3.1"
},
"products": [
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"9Base-RHOSO-18.0:openstack-nova-novncproxy-1:27.5.2-18.0.20260312122217.c1c6d67.el9ost.noarch",
"9Base-RHOSO-18.0:openstack-nova-scheduler-1:27.5.2-18.0.20260312122217.c1c6d67.el9ost.noarch",
"9Base-RHOSO-18.0:openstack-nova-serialproxy-1:27.5.2-18.0.20260312122217.c1c6d67.el9ost.noarch",
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]
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "openstack-nova-compute: Arbitrary Host File Overwrite via Unconstrained qemu-img Format Handling in OpenStack Nova"
}
]
}
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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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