CVE-2022-31214: A Privilege Context Switching issue was discovered in join.c in Firejail 0.9.68

This month

HIGH 7.8WATCHLISTDOWNGRADEMITIGATEMITIGATE

CVE-2022-31214 is a high-severity flaw (CVSS 7.8) affecting firejail, fedora, debian linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A Privilege Context Switching issue was discovered in join.c in Firejail 0.9.68. By crafting a bogus Firejail container that is accepted by the Firejail setuid-root program as a join target, a local attacker can enter an environment in which the Linux user namespace is still the initial user namespace, the NO_NEW_PRIVS prctl is not activated, and the entered mount namespace is under the attacker's control. In this way, the filesystem layout can b

Why this priority

High severity
On your watchlist

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

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.4% (top 65%)
CISA exploited list	No
Weakness	CWE-269
Published	2022-06-09
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: debian · fedoraproject · firejail project

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

Am I affected?

Timeline

2022-06-09 16:15 UTCPublished CVE record published
2026-06-17 04:45 UTCUpdated Record last modified

firejail project firejail DOWNGRADE

Affected: 0.9.68

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.9.68

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 0.9.68 (Debian / Ubuntu)

apt-cache madison firejail sudo apt install firejail=<VERSION_BEFORE_0.9.68> sudo apt-mark hold firejail

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

dnf --showduplicates list firejail sudo dnf downgrade firejail-<VERSION_BEFORE_0.9.68> sudo dnf versionlock add firejail

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: 35 · 36 · 37

Fixed in: no fixed release known

Safe to downgrade to: a release before 35

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.

debian debian linux MITIGATE

Affected: 9.0 · 10.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 9.0

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-2022-31214?

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

Is CVE-2022-31214 being exploited?

CVE-2022-31214 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-2022-31214 affect?

CVE-2022-31214 affects firejail, fedora, debian linux. Severity is high (CVSS 7.8). A Privilege Context Switching issue was discovered in join.c in Firejail 0.9.68. By crafting a bogus Firejail container that is accepted by the Firejail setuid-root program as a join target, a local attacker can enter an environment in whic

How urgent is CVE-2022-31214?

Priority 41/100. High severity; On your watchlist

Software pages

Debian vulnerabilities

Related CVEs

CVE-2021-26910 HIGH 7.8 UPGRADE MITIGATE Firejail before 0.9.64.4 allows attackers to bypass intended access restrictions because there is a TOCTOU rac

References

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