Candidate: CVE-2006-5173
References: 
 http://kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=47a5c6fa0e204a2b63309c648bb2fde36836c826
Description:
 Alignment Check (AC) flag in EFLAGS is not saved/restored during task
 switch, thus was leaking to other tasks. Those eventually died with a
 SIGBUS.
Ubuntu-Description:
 The task switching code did not save and restore EFLAGS of processes.
 By starting a specially crafted executable, a local attacker could
 exploit this to eventually crash many other running processes.
Notes: 
 incorrect optimization in some later 2.6.x kernel, reverted
 Local DoS.

 Are we sure this affects 2.6.17 and before? The CFI_ADJUST_CFA_OFFSET
 doesn't seem to be present in these kernels.
Bugs: 
upstream: released (2.6.18)
linux-2.6: released (2.6.18-1)
2.6.8-sarge-security: N/A
2.4.27-sarge-security: N/A
2.6.10-hoary-security: N/A
2.6.12-breezy-security: N/A
2.6.15-dapper-security: released (2.6.15-27.49)
2.6.17-edgy: released (2.6.17.1-10.34)