📖 ~4 min read • Source: AlmaLinux/RHEL advisory ALSA-2022:8420
Related CVEs: CVE-2018-25032
Upstream summary: The zlib packages provide a general-purpose lossless data compression library that is used by many different programs.
Security Fix(es):
* zlib: A flaw found in zlib when compressing (not decompressing) certain inputs (CVE-2018-25032)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Additional Changes:
For detailed information on cha
Table of contents
Symptom & Impact
On CentOS Stream 9 hosts running mingw-zlib, operators report behaviour consistent with AlmaLinux/RHEL advisory ALSA-2022:8420: dnf refusing to install or restart affected services, SELinux AVC denials in /var/log/audit/audit.log, and — for security-rated advisories — exposure to the vulnerability set above. In production estates the visible impact ranges from a single service restart to wider availability incidents whenever mingw-zlib sits on the serving path.
Environment & Reproduction
Reproduction targets CentOS Stream 9. Confirm release with cat /etc/centos-release and cat /etc/os-release, and the currently installed package with rpm -q mingw-zlib. Capture system state with sosreport --batch -k crio.all=on if you need an evidence bundle for a vendor support case. Trigger the workflow that exposes mingw-zlib — vulnerability — patch and remediation guide while collecting journalctl -b, dnf history, and rpm -qa output.
Root Cause Analysis
Root cause is documented in AlmaLinux/RHEL advisory ALSA-2022:8420. Upstream maintainers shipped fixes in the corresponding mingw-zlib update for CentOS Stream 9; running an outdated build leaves the host exposed to the failure modes described in the advisory. Correlate journalctl --since timestamps with dnf history entries and any SELinux denials in /var/log/audit/audit.log (or ausearch -m AVC,USER_AVC -ts recent) to isolate the originating change.
Quick Triage
Quick triage: run systemctl status mingw-zlib, journalctl -u mingw-zlib -n 200, dnf check-update --security, dnf updateinfo list cves, firewall-cmd --list-all, and getenforce. If SELinux is enforcing, capture ausearch -m AVC -ts recent to surface denials linked to mingw-zlib — vulnerability — patch and remediation guide.
Step-by-Step Diagnosis
1) Confirm symptom with systemctl --failed. 2) Inspect logs: journalctl -xe and journalctl -u mingw-zlib. 3) Validate firewall: firewall-cmd --list-all-zones. 4) Check SELinux: getenforce, sestatus, ausearch -m AVC,USER_AVC -ts recent. 5) Verify package integrity: rpm -V mingw-zlib and dnf reinstall mingw-zlib. 6) Correlate findings with dnf history, /var/log/dnf.log, and AlmaLinux/RHEL advisory ALSA-2022:8420 to pin the change that introduced mingw-zlib — vulnerability — patch and remediation guide.
Solution – Primary Fix
Primary fix for mingw-zlib — vulnerability — patch and remediation guide: apply the corrective dnf transaction described in AlmaLinux/RHEL advisory ALSA-2022:8420, reload the affected systemd unit, and reconcile firewalld and SELinux state. Typical commands: sudo dnf -y makecache, sudo dnf -y upgrade --security or sudo dnf -y upgrade mingw-zlib, sudo systemctl daemon-reload, sudo systemctl restart mingw-zlib, then rpm -q mingw-zlib to validate the new build is installed. For kernel advisories add sudo systemctl reboot or apply kpatch-dnf live patches where covered by your subscription.
Need help rolling this patch across a CentOS Stream fleet? Our IT Solutions & Services team manages CentOS / RHEL patch windows with zero-downtime change controls. Get in touch for a free consultation.
Solution – Alternative Approaches
Alternatives include rolling back the offending transaction with sudo dnf history undo <id>, version-locking the package via sudo dnf install python3-dnf-plugin-versionlock then sudo dnf versionlock add mingw-zlib, switching firewalld backends between nftables and iptables in /etc/firewalld/firewalld.conf, switching SELinux to permissive temporarily with sudo setenforce 0 to confirm policy is the cause before authoring a custom policy module via audit2allow. Where kpatch is licensed, kpatch list and kpatch load apply kernel fixes without reboot.
Verification & Acceptance Criteria
Acceptance: rpm -q mingw-zlib shows the expected fixed version, systemctl is-active mingw-zlib returns active, journalctl -u mingw-zlib --since "5 minutes ago" shows no errors, dnf updateinfo list cves --installed no longer lists the CVEs above, firewall-cmd --list-services includes the required services, getenforce reports the intended mode, and the original reproduction steps for mingw-zlib — vulnerability — patch and remediation guide no longer trigger the failure across two consecutive runs.
Rollback Plan
Capture state with dnf history list, rpm -qa > /root/rpm-pre.txt, and where available lvcreate -s -n preupgrade -L 4G /dev/<vg>/<lv> for an LVM snapshot. To revert, run sudo dnf history undo <id> (or sudo dnf install --allowerasing mingw-zlib-<old-version>) and reload systemctl daemon-reload. Remove custom SELinux modules with sudo semodule -r <module>. Reboot if the kernel or initramfs was changed and re-verify symptoms.
Prevention & Hardening
Prevent recurrence by enabling dnf-automatic with upgrade_type = security in /etc/dnf/automatic.conf, subscribing to centos-announce / rhsa-announce, mirroring through a local Pulp / Foreman / Spacewalk-style repo for controlled rollouts, version-locking sensitive packages, and monitoring file integrity with aide --check. Apply CIS CentOS Stream 9 hardening, keep SELinux enforcing, and where supported enable kpatch live patching so future advisories like this can be remediated without reboot.
Related Errors & Cross-Refs
Related issues that commonly surface alongside mingw-zlib — vulnerability — patch and remediation guide: dnf transaction lock contention, systemd unit ordering cycles, SELinux AVC denials in journalctl -k, firewalld zone drift, and kernel taint flags shown by cat /proc/sys/kernel/tainted. See sibling common-problem articles in this CentOS Stream 9 series for adjacent failure modes.
View all centos-stream-9 tutorials on the Tutorials Hub →
Browse all common problems & solutions on the Tutorials Hub.
References & Further Reading
Primary reference: AlmaLinux/RHEL advisory ALSA-2022:8420. Supporting docs: Red Hat / CentOS Stream Administration Guide, man dnf, man systemctl, man firewall-cmd, man semanage, man audit2allow, man journalctl, the Red Hat CVE database at access.redhat.com/security/cve/, and the kpatch documentation. Review /usr/share/doc/mingw-zlib/ for component-level notes implicated in mingw-zlib — vulnerability — patch and remediation guide.
