📖 ~4 min read • Source: SUSE advisory RHSA-2026:6628 (see also SUSE bugzilla)
Related CVEs: CVE-2025-15270 CVE-2025-15269 CVE-2025-15275 CVE-2025-15279 CVE-2024-25081 CVE-2024-25082 CVE-2020-5395 CVE-2020-5496 +1 more
Upstream summary: FontForge SFD File Parsing Improper Validation of Array Index Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of FontForge. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the parsing of SFD files. The issue results from the lack of proper validation of user-supplied data, which
Table of contents
Symptom & Impact
On SLES 16 hosts running fontforge, administrators report behaviour consistent with SUSE advisory RHSA-2026:6628: zypper refusing to install or restart affected services, AppArmor profile warnings in journalctl, 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 fontforge sits on the serving path.
Environment & Reproduction
Reproduction targets SLES 16. Confirm release with cat /etc/os-release and SUSEConnect --status-text, and the currently installed package with rpm -q fontforge. Capture system state with supportconfig -R /var/tmp -B fontforge if you need to attach evidence to a SUSE support case. Trigger the workflow that exposes fontforge — multiple vulnerabilities (9 CVEs) — patch and remediation guide while collecting journalctl -b, zypper history, and rpm -qa output.
Root Cause Analysis
Root cause is documented in SUSE advisory RHSA-2026:6628. Upstream maintainers shipped fixes in the corresponding fontforge update for SLES 16; running an outdated build leaves the host exposed to the failure modes described in the advisory. Correlate journalctl --since timestamps with zypper history entries and any AppArmor denials in /var/log/audit/audit.log to isolate the originating change.
Quick Triage
Quick triage: run systemctl status fontforge, journalctl -u fontforge -n 200, zypper patch-check, zypper lp, firewall-cmd --list-all, and aa-status. If AppArmor is in enforce mode, capture journalctl -k | grep apparmor to surface denials linked to fontforge — multiple vulnerabilities (9 CVEs) — patch and remediation guide.
Step-by-Step Diagnosis
1) Confirm symptom with systemctl --failed. 2) Inspect logs: journalctl -xe and journalctl -u fontforge. 3) Validate firewall: firewall-cmd --list-all-zones. 4) Check AppArmor: aa-status and journalctl -k | grep apparmor. 5) Verify package integrity: rpm -V fontforge and zypper verify. 6) Correlate findings with zypper history, /var/log/zypp/history, and SUSE advisory RHSA-2026:6628 to pin the change that introduced fontforge — multiple vulnerabilities (9 CVEs) — patch and remediation guide.
Solution – Primary Fix
Primary fix for fontforge — multiple vulnerabilities (9 CVEs) — patch and remediation guide: apply the corrective zypper transaction described in SUSE advisory RHSA-2026:6628, reload the affected systemd unit, and reconcile firewalld and AppArmor state. Typical commands: sudo zypper ref, sudo zypper -n patch or sudo zypper -n update fontforge, sudo systemctl daemon-reload, sudo systemctl restart fontforge, then rpm -q fontforge to validate the new build is installed. For kernel advisories add sudo systemctl reboot or schedule a Live Patch (kgraft/klp) where covered by your SUSE subscription.
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Solution – Alternative Approaches
Alternatives include rolling back the offending transaction with sudo zypper history --rollback <id> (Btrfs Snapper snapshots make this safe on SLES 16), locking the package via sudo zypper al fontforge, switching firewalld backends between nftables and iptables in /etc/firewalld/firewalld.conf, or temporarily disabling the AppArmor profile with sudo aa-disable /etc/apparmor.d/usr.sbin.fontforge to confirm policy is the cause before authoring a custom profile. Where Live Patching is licensed, klp patches applies kernel fixes without reboot.
Verification & Acceptance Criteria
Acceptance: rpm -q fontforge shows the expected fixed version, systemctl is-active fontforge returns active, journalctl -u fontforge --since "5 minutes ago" shows no errors, zypper patch-check reports zero open patches for this advisory, firewall-cmd --list-services includes the required services, aa-status reports the intended profile mode, and the original reproduction steps for fontforge — multiple vulnerabilities (9 CVEs) — patch and remediation guide no longer trigger the failure across two consecutive runs.
Rollback Plan
Capture state with zypper history list, snapper list, and rpm -qa > /root/rpm-pre.txt before any change. To revert, run sudo snapper undochange <pre>..<post> on Btrfs deployments or sudo zypper install --oldpackage fontforge-<old-version> and reload systemctl daemon-reload. Remove custom AppArmor profiles with sudo apparmor_parser -R. Reboot if the kernel or initramfs was changed and re-verify symptoms.
Prevention & Hardening
Prevent recurrence by enabling automatic security patches with zypper-automatic or YaST > Online Update Configuration, subscribing to the SUSE-SU mailing list, mirroring through SUSE Manager / RMT for controlled rollouts, version-locking sensitive packages with zypper al, and monitoring file integrity with aide --check. Apply CIS SLES 16 hardening, enable Snapper rollbacks on Btrfs root, and where supported enable SUSE Live Patching so future advisories like this can be remediated without reboot.
Related Errors & Cross-Refs
Related issues that commonly surface alongside fontforge — multiple vulnerabilities (9 CVEs) — patch and remediation guide: zypper transaction lock contention, systemd unit ordering cycles, AppArmor 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 SLES 16 series for adjacent failure modes.
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References & Further Reading
Primary reference: SUSE advisory RHSA-2026:6628 (see also SUSE bugzilla). Supporting docs: SUSE Linux Enterprise Server Administration Guide, man zypper, man systemctl, man firewall-cmd, man aa-status, man snapper, man journalctl, the SUSE patch finder at suse.com/patches/, and the SUSE Live Patching documentation. Review /usr/share/doc/packages/fontforge/ for component-level notes implicated in fontforge — multiple vulnerabilities (9 CVEs) — patch and remediation guide.
