Fedora 42 users: Urgent Chromium update fixes CVE-2025-6555, CVE-2025-6556, CVE-2025-6557—critical security flaws allowing code execution & data leaks. Learn how to patch now and secure your Linux system.
Urgent Security Advisory for Linux Users
Fedora 42 users must immediately update Chromium to version 138.0.7204.49 to mitigate three critical vulnerabilities that could lead to remote code execution, data leaks, and browser hijacking. This patch addresses:
CVE-2025-6555: Use-after-free in Animation (High Severity)
CVE-2025-6556: Insufficient policy enforcement in Loader (Medium Severity)
CVE-2025-6557: Insufficient data validation in DevTools (Medium Severity)
Why is this update critical?
Unpatched, these vulnerabilities could allow attackers to exploit memory corruption, bypass security policies, and manipulate developer tools—putting sensitive user data at risk.
Detailed Vulnerability Breakdown
1. CVE-2025-6555: Use-After-Free in Animation
Risk: Remote code execution via crafted web content.
Impact: Attackers could crash Chromium or execute arbitrary code.
Solution: Update to Chromium 138.0.7204.49.
2. CVE-2025-6556: Insufficient Policy Enforcement in Loader
Risk: Security bypass leading to unauthorized resource access.
Impact: Malicious sites could load restricted content.
Solution: Enhanced policy checks in the latest update.
3. CVE-2025-6557: Insufficient Data Validation in DevTools
Risk: Manipulation of debugging tools to extract sensitive data.
Impact: Developers using DevTools could be targeted.
Solution: Strict input validation implemented.
How to Update Chromium on Fedora 42
Run the following command to apply the security patch:
sudo dnf upgrade --advisory FEDORA-2025-1a665fa5c8
Alternative method: Use GNOME Software or KDE Discover for GUI-based updates.
Security Best Practices for Linux Users
Enable automatic updates for critical packages.
Monitor security advisories from Red Hat and Fedora.
Use a firewall (e.g.,
firewalld) to restrict unnecessary access.Avoid untrusted browser extensions that could exploit vulnerabilities.
Official References & Bug Reports
FAQ: Fedora Chromium Security Update
Q: Is this update mandatory?
A: Yes, due to the high-risk nature of these CVEs.
Q: Will this break my existing browser sessions?
A: No, but a restart is recommended.
Q: Are other Linux distributions affected?
A: Yes, but Fedora has released the patch first.
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