CVE-2018-1064: libvirt version before 4.2.0-rc1 is vulnerable to a resource exhaustion as a result of an incomplete fix for C

Q: How do I fix CVE-2018-1064?

debian linux: mitigate or apply the listed mitigation; libvirt: upgrade to newer than 4.1.0. Exact commands for each OS are on this page.

Q: Is CVE-2018-1064 being exploited?

CVE-2018-1064 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2018-1064 affect?

CVE-2018-1064 affects debian linux, libvirt. Severity is high (CVSS 7.5). libvirt version before 4.2.0-rc1 is vulnerable to a resource exhaustion as a result of an incomplete fix for CVE-2018-5748 that affects QEMU monitor but now also triggered via QEMU guest agent.

Q: How urgent is CVE-2018-1064?

Priority 58/100. High severity; Remotely exploitable, no login, no user action; On your watchlist

This month

HIGH 7.5REMOTEWATCHLISTMITIGATEUPGRADE

CVE-2018-1064 is a high-severity flaw (CVSS 7.5) affecting debian linux, libvirt. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

libvirt version before 4.2.0-rc1 is vulnerable to a resource exhaustion as a result of an incomplete fix for CVE-2018-5748 that affects QEMU monitor but now also triggered via QEMU guest agent.

Why this priority

High severity
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.9% (top 13%)
CISA exploited list	No
Weakness	CWE-400
Published	2018-03-28
Last modified	2026-06-17

Publisher (CNA): Red Hat, Inc. · Vendor: debian · redhat

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2018-03-28 18:29 UTCPublished CVE record published
2026-06-17 01:50 UTCUpdated Record last modified

debian debian linux MITIGATE

Affected: 7.0 · 8.0 · 9.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 7.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

redhat libvirt UPGRADE

Affected: <= 4.1.0

Fixed in: newer than 4.1.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy libvirt || rpm -q libvirt || libvirt --version

2. UPGRADE to newer than 4.1.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade libvirt

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade libvirt

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2018-1064?

debian linux: mitigate or apply the listed mitigation; libvirt: upgrade to newer than 4.1.0. Exact commands for each OS are on this page.

Is CVE-2018-1064 being exploited?

CVE-2018-1064 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2018-1064 affect?

CVE-2018-1064 affects debian linux, libvirt. Severity is high (CVSS 7.5). libvirt version before 4.2.0-rc1 is vulnerable to a resource exhaustion as a result of an incomplete fix for CVE-2018-5748 that affects QEMU monitor but now also triggered via QEMU guest agent.

How urgent is CVE-2018-1064?

Priority 58/100. High severity; Remotely exploitable, no login, no user action; On your watchlist

Software pages

Debian vulnerabilities · QEMU vulnerabilities

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References

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