CVE-2018-7858: n/a vulnerability

CVE-2018-7858: Quick Emulator (aka QEMU), when built with the Cirrus CLGD 54xx VGA Emulator support, allows local guest OS...

Quick Emulator (aka QEMU), when built with the Cirrus CLGD 54xx VGA Emulator support, allows local guest OS privileged users to cause a denial of service (out-of-bounds access and QEMU process crash) by leveraging incorrect region calculation when updating VGA display.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 5, 2024, 06:37 UTC (UTC+00:00)

Security readout for executives and security teams

This QEMU flaw can let an administrator inside a virtual machine crash the QEMU process by abusing the Cirrus CLGD 54xx VGA emulation path. The main business impact is availability loss for affected virtual machines, not confirmed data theft or host takeover. Exposure is most likely in virtualization hosts running QEMU packages that include Cirrus CLGD 54xx VGA emulation and assign that virtual VGA device to guests. The source bundle does not identify specific affected versions beyond vendor advisories. Prioritize remediation on shared virtualization hosts, cloud-like environments, and systems running untrusted or tenant-managed guests. The urgency is lower than remote code execution, but a guest administrator could disrupt VM availability. Mitigation focus: Apply relevant QEMU security updates from your Linux vendor.; Review Red Hat, Ubuntu, and openSUSE advisories for package-specific fixed versions.; Check upstream QEMU guidance for the VGA region calculation fix..

Prepared: Jun 7, 2026, 14:22 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Mar 12, 2018, 21:00 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors

0Timeline events

0ADP providers

7Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

CVE List V5 sourceCVE List V5
RHSA-2018:2162CVE reference · vendor-advisory, x_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=1553402CVE reference · x_refsource_CONFIRM
RHSA-2018:1369CVE reference · vendor-advisory, x_refsource_REDHAT
USN-3649-1CVE reference · vendor-advisory, x_refsource_UBUNTU
RHSA-2018:1416CVE reference · vendor-advisory, x_refsource_REDHAT
[qemu-devel] 20180308 [PATCH] vga: fix region calculationCVE reference · mailing-list, x_refsource_MLIST

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

n/an/an/aListed

Weakness

CWE details

No CWE listed

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