Oracle is pleased to announce the general availability of Enterprise Linux Release 4 Update 6

Red Hat Enterprise Linux 4.6 (RHEL4.6 : kernel-2.6.9-67.EL) Released - tmpfile::memoから約一ヶ月。
[El-errata] Enterprise Linux Release 4 Update 6 for x86 (32 bit)and x86_64 (64 Bit) architectures
Mon Dec 10 09:23:09 PST 2007

Bug Fixes added by Oracle 

  fix entropy flag in bnx2 driver to generate entropy pool [ORA 5931647] 
  fix enomem due to larger mtu size page alloc [ORA 5486128]
  fix per_cpu() api bug_on with rds [ ORA 5760648] 
  remove patch sysrq-b that queues up to keventd thread [ORA 6125546] 
  allow more than 4GB hugepage for single user [ORA 6002738] 
  netrx/netpoll race avoidance  [ORA 6143381] 

だそうです。