CVE-2005-3356: The mq_open system call in Linux kernel 2.6.9, in certain situations, can decrement a counter twice ("doubl...

Security readout for executives and security teams

This is an old Linux kernel flaw where a local user could trigger a kernel panic and crash the system. It affects Linux kernel 2.6.9 in the provided record, with multiple 2006 Linux vendor advisories referenced. The record does not show remote compromise or data theft. Exposure is most likely on legacy or embedded systems still running unpatched 2.6.9-era Linux kernels or downstream vendor kernels covered by the listed 2006 advisories. Modern managed Linux distributions are unlikely to be affected if regularly updated. Treat this as a legacy-infrastructure availability risk. It is not shown as actively exploited, but any affected shared server could be crashed by a local user, so unsupported kernels should be patched, isolated, or retired. Mitigation focus: Identify any systems running Linux kernel 2.6.9 or related vendor kernels.; Apply kernel updates from the relevant Linux vendor advisory.; Restrict local shell access on legacy systems until patched or retired..

Prepared

Jun 29, 2026, 15:05 UTC (UTC+00:00)

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