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Flatcar Container Linux

lts-4081.3.9Provisioning & Runtime
Jul 9, 2026

Flatcar Container Linux lts-4081.3.9 is a security-focused patch delivering a large kernel CVE fix set via Linux 6.6.144, alongside a ca-certificates update. No breaking changes or removals.

  • securityPatch 144 kernel CVEs via Linux 6.6.144

    Flatcar Container Linux lts-4081.3.9 bundles 144 Linux kernel CVEs fixed via upgrade to kernel 6.6.144 (which also incorporates 6.6.143 and 6.6.142). The highest-severity issues in this set include multiple vulnerabilities affecting core kernel subsystems; a sample of notable CVEs: CVE-2026-46242, CVE-2026-53357, CVE-2026-52941. Upgrade to patch your running systems.

Key changes (2)

  • 144 Linux kernel CVEs (HIGH severity, max) addressed in kernel 6.6.144 update
  • ca-certificates bumped to version 3.125
Source ↗All Flatcar Container Linux releases →