CVE-2006-6056: Linux kernel 2.6.x up to 2.6.18 and possibly other versions, when SELinux hooks are enabled, allows local u...

Security readout for executives and security teams

This is an old Linux kernel denial-of-service issue. A local user could crash vulnerable systems when SELinux hooks are enabled by causing the kernel to process a malformed file stream, reportedly demonstrated with an HFS filesystem image. It is not described as remote code execution or privilege escalation in the provided sources. Exposure is most likely on legacy Linux systems, embedded appliances, or unsupported distributions still running affected 2.6-era kernels with SELinux hooks enabled. Modern supported Linux distributions are unlikely to be exposed if vendor kernel updates have been applied. Treat this as a legacy-platform stability risk. It is not presented as internet-exploitable in the provided sources, but any affected production system could be crashed by a local user or local process. Prioritize unsupported or appliance-like systems that cannot be patched quickly. Mitigation focus: Identify systems running Linux 2.6.x kernels up to 2.6.18.; Check SUSE, Red Hat, Ubuntu, Mandriva, Debian, and appliance vendor advisories for fixed kernels.; Apply the relevant vendor-supported kernel update and reboot into it..

Prepared

Jun 29, 2026, 09:12 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.