iTechGuides is reader-supported. When you buy through links on our site, we may earn an affiliate commission. As an Amazon Associate I earn from qualifying purchases. Learn more
Red Hat’s urgent warning was issued on March 29, 2024 (updated March 30) after malicious code was found in xz versions 5.6.0 and 5.6.1. The incident concerned specific Fedora 40 beta and Fedora Rawhide packages—not every Fedora installation—and was tracked as CVE-2024-3094. This is a historical alert, not a new warning issued in September 2026.
Which Fedora systems were in scope?
Red Hat identified tampered xz tools and libraries in versions 5.6.0 and 5.6.1. The affected distribution and build mattered:
| Environment | What Red Hat reported | Package detail |
|---|---|---|
| Fedora 40 beta | Users may have received xz 5.6.0. Red Hat advised reverting to the 5.4.x series as a precaution. | xz-libs-5.6.0-1.fc40.x86_64.rpm and xz-libs-5.6.0-2.fc40.x86_64.rpm were named in the March 30 update. |
| Fedora Rawhide | Users may have received xz 5.6.0 or 5.6.1. Red Hat told users to stop using affected instances until they were downgraded. | Exact exposure depended on the installed package and update state. |
| Red Hat Enterprise Linux | Red Hat stated that no RHEL versions were affected by this CVE. | RHEL is distinct from Fedora’s development and beta channels. |
The Red Hat CVE record later described affected packages in Fedora 41 and Fedora Rawhide in the Red Hat community ecosystem. That record and the contemporaneous blog alert serve different incident-response contexts; they should not be read as a single timeless list of every Fedora release.
Quick wins for a faster PC:
Clear out junk files and repair common Windows errorsFree Scan →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Why CVE-2024-3094 was dangerous
The malicious build interfered with SSH daemon authentication through systemd. Under the right circumstances, that interference could permit unauthorized remote access, turning a seemingly ordinary compression-library update into a potential system-entry mechanism.
How the injected code was introduced
Red Hat’s CVE description says the build process extracted a prebuilt object from a disguised test file and used it to modify liblzma functions. Because liblzma is used by software beyond the xz command itself, the tampering could affect authentication-related behavior indirectly.
Severity was not an infection count
Red Hat’s 2024 CVE record listed a preliminary CVSS v3 score of 10. That is a severity assessment, not a count of compromised computers, an infection rate, or proof that every system with an affected package was breached. The primary Red Hat sources did not publish a population-wide number of compromised Fedora machines.
Rank #2
Exposure was not the same as confirmed compromise
Red Hat warned about potentially affected packages but said Fedora 40 builds had not been shown to be compromised by the actual exploit and that it believed the injection did not take effect in those builds. The precautionary downgrade recommendation still applied. Administrators should therefore distinguish three questions:
Recommended Free Tools
- Was an affected xz package installed?
- Did the package contain the malicious build behavior?
- Is there evidence that the system was actually exploited?
A “yes” to the first question establishes package exposure, not a confirmed intrusion.
Rank #3
What Red Hat told users to do in 2024
Fedora Rawhide
Red Hat’s alert said: “PLEASE IMMEDIATELY STOP USAGE OF ANY FEDORA RAWHIDE INSTANCES for work or personal activity.” The instruction was to stop using affected instances until they could be downgraded.
Fedora 40 beta
Red Hat advised reverting xz to the 5.4.x series. The company said a rollback update was becoming available through Fedora’s normal update system and pointed readers to Fedora Bodhi update FEDORA-2024-d02c7bb266.
How to apply the advice today
The downgrade instructions above record the 2024 response. A current Fedora installation should follow Fedora’s present support and security guidance rather than blindly applying an obsolete package command. First identify the release and installed xz packages, then use the supported Fedora repositories and update workflow for that release. If you suspect compromise, isolate the host and use your organization’s incident-response procedure instead of treating a package downgrade as proof of cleanup.
The Tool Desk
Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →What the alert did—and did not—say about RHEL
Red Hat explicitly stated, “No versions of Red Hat Enterprise Linux (RHEL) are affected by this CVE.” That statement applies to RHEL products, not to Fedora’s development channels. Fedora Rawhide and Fedora beta packages can move ahead of enterprise distributions, so a Fedora warning cannot be generalized to all Red Hat products.
Best Value
Practical checks for a potentially affected Fedora host
- Confirm the distribution and release. Determine whether the machine is Fedora 40 beta, Fedora Rawhide, another Fedora release, or RHEL.
- Inspect the installed xz version and architecture. Compare the package with the affected 5.6.0 and 5.6.1 builds, including the two Fedora 40 beta RPM names identified by Red Hat.
- Stop use of an affected Rawhide instance. Do not continue normal work or personal activity from it while it remains on the affected build.
- Use Fedora’s supported rollback or update path. For the 2024 Fedora 40 response, that meant moving back to xz 5.4.x; current systems should use the guidance and repositories maintained for their release.
- Investigate separately if compromise is suspected. Preserve relevant logs, isolate the host, rotate credentials from a known-clean system, and involve qualified responders.
What remains important when reading coverage of the incident
- The warning was about particular package versions and builds, not an automatic compromise of every Fedora computer.
- Fedora 40 beta and Fedora Rawhide were discussed differently, with different contemporaneous instructions.
- RHEL was explicitly excluded by Red Hat.
- The CVSS 10 score communicates maximum severity, not the number of victims.
- Red Hat’s statement about Fedora 40 not being shown compromised does not remove the need to remediate an affected installation.
The Bottom Line
CVE-2024-3094 was a serious 2024 supply-chain incident involving xz 5.6.0 and 5.6.1. The relevant response was to identify the exact Fedora build, stop using affected Rawhide systems, downgrade the Fedora 40 beta package as Red Hat advised, and keep package exposure distinct from confirmed exploitation. Red Hat said no RHEL versions were affected.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
