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It's a familiar refrain. A new Linux kernel is released and a short time later it's augmented by a point release that addresses a potential security vulnerability.
The new 188.8.131.52 Linux kernel point release follows the 2.6.16 release by a week and includes various bug fixes, as well as a fix for a potential security vulnerability.
The potential vulnerability is called the "Linux Kernel IP ID Value Increment Weakness" by security firm Secunia and carries a "not-critical" rating.