CVE-2022-23218: The deprecated compatibility function svcunix_create in the sunrpc module of the GNU C Library (aka glibc) thr

This week

CRITICAL 9.8REMOTEWATCHLISTUPGRADEDOWNGRADEDOWNGRADE

CVE-2022-23218 is a critical-severity flaw (CVSS 9.8) affecting glibc, communications cloud native core unified data repository, enterprise operations monitor. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The deprecated compatibility function svcunix_create in the sunrpc module of the GNU C Library (aka glibc) through 2.34 copies its path argument on the stack without validating its length, which may result in a buffer overflow, potentially resulting in a denial of service or (if an application is not built with a stack protector enabled) arbitrary code execution.

Why this priority

Critical severity
EPSS top 7%: very likely to be exploited
Public exploit reference
CISA SSVC: automatable with total technical impact
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	5.3% (top 7%)
CISA exploited list	No
Weakness	CWE-120
Published	2022-01-14
Last modified	2026-10-14

Publisher (CNA): MITRE · Vendor: debian · gnu · oracle

Last updated 2026-10-14 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2022-01-14 07:15 UTCPublished CVE record published
2026-10-14 16:17 UTCUpdated Record last modified

gnu glibc UPGRADE

Affected: < 2.31

Fixed in: 2.31

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 2.31 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade glibc

Note

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

oracle communications cloud native core unified data repository DOWNGRADE

Affected: 22.2.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 22.2.0

1. Check installed version

apt-cache policy communications-cloud-native-core-unified-data-repository || rpm -q communications-cloud-native-core-unified-data-repository || communications-cloud-native-core-unified-data-repository --version

2. No fixed release: DOWNGRADE to a release before 22.2.0 (Debian / Ubuntu)

apt-cache madison communications-cloud-native-core-unified-data-repository sudo apt install communications-cloud-native-core-unified-data-repository=<VERSION_BEFORE_22.2.0> sudo apt-mark hold communications-cloud-native-core-unified-data-repository

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

dnf --showduplicates list communications-cloud-native-core-unified-data-repository sudo dnf downgrade communications-cloud-native-core-unified-data-repository-<VERSION_BEFORE_22.2.0> sudo dnf versionlock add communications-cloud-native-core-unified-data-repository

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.

oracle enterprise operations monitor DOWNGRADE

Affected: 4.3 · 4.4 · 5.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.3

1. Check installed version

apt-cache policy enterprise-operations-monitor || rpm -q enterprise-operations-monitor || enterprise-operations-monitor --version

2. No fixed release: DOWNGRADE to a release before 4.3 (Debian / Ubuntu)

apt-cache madison enterprise-operations-monitor sudo apt install enterprise-operations-monitor=<VERSION_BEFORE_4.3> sudo apt-mark hold enterprise-operations-monitor

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

dnf --showduplicates list enterprise-operations-monitor sudo dnf downgrade enterprise-operations-monitor-<VERSION_BEFORE_4.3> sudo dnf versionlock add enterprise-operations-monitor

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.

debian debian linux MITIGATE

Affected: 10.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 10.0

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.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.

Fedora 46 · nemo · FIXED · 6.8.0-1.fc46 · FEDORA-2026-0edead723f · source

sudo dnf upgrade --advisory=FEDORA-2026-0edead723f

Fedora ELN · composer · FIXED · 2.11.1-1.eln159 · FEDORA-2026-cb4f992456 · source

sudo dnf upgrade --advisory=FEDORA-2026-cb4f992456

Ubuntu 20.04 · glibc · FIXED · 2.31-0ubuntu9.7

sudo apt update && sudo apt install --only-upgrade glibc dpkg --compare-versions "$(dpkg-query -W -f='${Version}' glibc)" ge "2.31-0ubuntu9.7" && echo PATCHED || echo STILL-VULNERABLE

Ubuntu 22.04 · glibc · NOT AFFECTED

Ubuntu 24.04 · glibc · NOT AFFECTED

Ubuntu 24.10 · glibc · NOT AFFECTED

Ubuntu 25.04 · glibc · NOT AFFECTED

Debian 12 · glibc · FIXED · 2.33-3

sudo apt update && sudo apt install --only-upgrade glibc dpkg --compare-versions "$(dpkg-query -W -f='${Version}' glibc)" ge "2.33-3" && echo PATCHED || echo STILL-VULNERABLE

Debian 13 · glibc · FIXED · 2.33-3

sudo apt update && sudo apt install --only-upgrade glibc dpkg --compare-versions "$(dpkg-query -W -f='${Version}' glibc)" ge "2.33-3" && echo PATCHED || echo STILL-VULNERABLE

RHEL 8 · glibc · FIXED · glibc-2.28-164.el8_5.3

sudo dnf upgrade --advisory=RHSA-2022:0896 rpm -q glibc

RHEL 6 · compat-glibc · DEFERRED

RHEL 6 · glibc · DEFERRED

RHEL 7 · compat-glibc · DEFERRED

RHEL 7 · glibc · DEFERRED

Amazon Linux 2 · see advisory · FIXED · ALAS2-2022-1767 · source

sudo yum update --advisory=ALAS2-2022-1767

Amazon Linux 1 · see advisory · FIXED · ALAS-2022-1576 · source

sudo yum update --advisory=ALAS-2022-1576

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Write-up: www.oracle.com/security-alerts/cpujul2022.html

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-2022-23218?

glibc: upgrade to 2.31; communications cloud native core unified data repository: downgrade or apply the listed mitigation; enterprise operations monitor: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2022-23218 being exploited?

CVE-2022-23218 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-2022-23218 affect?

CVE-2022-23218 affects glibc, communications cloud native core unified data repository, enterprise operations monitor. Severity is critical (CVSS 9.8). The deprecated compatibility function svcunix_create in the sunrpc module of the GNU C Library (aka glibc) through 2.34 copies its path argument on the stack without validating its length, which may result in a buffer overflow, potentially

How urgent is CVE-2022-23218?

Priority 75/100. Critical severity; EPSS top 7%: very likely to be exploited; Public exploit reference; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action; On your watchlist

Software pages

Debian vulnerabilities · glibc vulnerabilities

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References

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