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libvirt CVE-2026-18917

| EUVDEUVD-2026-63239 HIGH
Integer Overflow or Wraparound (CWE-190)
2026-08-20 redhat GHSA-6jq9-9f7w-h7mc
Integer Overflow Buffer Overflow Privilege Escalation Denial Of Service Red Hat Enterprise Linux 10 Red Hat Enterprise Linux 6 Red Hat Enterprise Linux 7 Red Hat Enterprise Linux 8 Red Hat Enterprise Linux 9 Red Hat Enterprise Linux For Nvidia 26 Red Hat Suse
7.8
CVSS 3.1 · Vendor: redhat
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Severity by source

Vendor (redhat) PRIMARY
7.8 HIGH
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
vuln.today AI
7.8 HIGH

Local RPC socket access requires a local account (AV:L/PR:L); no race condition or special state needed (AC:L); root daemon heap corruption yields full C/I/A impact.

3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.0 AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
SUSE
HIGH
qualitative
Red Hat
7.8 HIGH
qualitative

Primary rating from Vendor (redhat).

CVSS VectorVendor: redhat

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

2
Analysis Generated
Aug 20, 2026 - 10:36 vuln.today
CVE Published
Aug 20, 2026 - 09:54 nvd
HIGH 7.8

DescriptionCVE.org

A flaw was found in libvirt. An unprivileged local user could exploit an integer overflow vulnerability in the NodeGetFreePages RPC handler. This flaw allows crafted values to bypass a size check, leading to an undersized memory buffer. Subsequently, real NUMA node data can overwrite this buffer. This heap buffer overflow can corrupt the root libvirt daemon's memory, potentially leading to a denial of service or local privilege escalation.

AnalysisAI

Local privilege escalation and denial of service in libvirt's NodeGetFreePages RPC handler allows an unprivileged local user to corrupt the root libvirtd daemon's heap memory through a crafted integer overflow. The CWE-190 flaw causes an undersized buffer allocation that is subsequently overwritten with real NUMA node data, enabling heap buffer overflow in a root-owned process. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation Exploitation requires a local unprivileged user account with access to the libvirtd Unix domain RPC socket. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 3.1 vector (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H, score 7.8) accurately models the attack surface: local low-privilege access with no interaction and no race condition requirement, yielding full confidentiality, integrity, and availability impact against a root daemon. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Apply vendor-supplied errata packages from Red Hat as documented at https://access.redhat.com/security/cve/CVE-2026-18917; obtain the exact patched libvirt package version from that advisory and apply via standard yum or dnf update procedures for the relevant RHEL version. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: audit all libvirt deployments to identify multi-tenant RHEL hosts running vulnerable libvirt versions, document current versions, and assess exposure based on local user population size. …

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Same weakness CWE-190 – Integer Overflow or Wraparound

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Same technique Integer Overflow

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Vendor StatusVendor

SUSE

Severity: Important
Product Status
openSUSE Tumbleweed Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS Affected

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CVE-2026-18917 vulnerability details – vuln.today
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