CVE-2023-2700: A vulnerability was found in libvirt

Routine

MEDIUM 5.5WATCHLISTDOWNGRADEMITIGATEMITIGATE

CVE-2023-2700 is a medium-severity flaw (CVSS 5.5) affecting libvirt, fedora, enterprise linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability was found in libvirt. This security flaw ouccers due to repeatedly querying an SR-IOV PCI device's capabilities that exposes a memory leak caused by a failure to free the virPCIVirtualFunction array within the parent struct's g_autoptr cleanup.

Why this priority

On your watchlist

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 83%)
CISA exploited list	No
Weakness	CWE-401
Published	2023-05-15
Last modified	2026-06-17

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

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

Am I affected?

Timeline

2023-05-15 22:15 UTCPublished CVE record published
2026-06-17 05:53 UTCUpdated Record last modified

redhat libvirt DOWNGRADE

Affected: 4.5.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.5.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 4.5.0 (Debian / Ubuntu)

apt-cache madison libvirt sudo apt install libvirt=<VERSION_BEFORE_4.5.0> sudo apt-mark hold libvirt

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list libvirt sudo dnf downgrade libvirt-<VERSION_BEFORE_4.5.0> sudo dnf versionlock add libvirt

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

fedoraproject fedora MITIGATE

Affected: 38

Fixed in: no fixed release known

Safe to downgrade to: a release before 38

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 enterprise linux MITIGATE

Affected: 8.0 · 9.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 8.0

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.

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-2023-2700?

libvirt: downgrade or apply the listed mitigation; fedora: mitigate or apply the listed mitigation; enterprise linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2023-2700 being exploited?

CVE-2023-2700 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-2023-2700 affect?

CVE-2023-2700 affects libvirt, fedora, enterprise linux. Severity is medium (CVSS 5.5). A vulnerability was found in libvirt. This security flaw ouccers due to repeatedly querying an SR-IOV PCI device's capabilities that exposes a memory leak caused by a failure to free the virPCIVirtualFunction array within the parent struct'

How urgent is CVE-2023-2700?

Priority 28/100. On your watchlist

Related CVEs

CVE-2024-8235 MEDIUM 6.2 UPGRADE A flaw was found in libvirt
CVE-2024-2496 MEDIUM 5.0 UPGRADE MITIGATE A NULL pointer dereference flaw was found in the udevConnectListAllInterfaces() function in libvirt
CVE-2023-3750 MEDIUM 6.5 MITIGATE MITIGATE A flaw was found in libvirt
CVE-2022-0897 MEDIUM 4.3 UPGRADE MITIGATE A flaw was found in the libvirt nwfilter driver
CVE-2021-4147 MEDIUM 6.5 UPGRADE MITIGATE A flaw was found in the libvirt libxl driver

References

← Back to latest CVEs