The robust futex implementation in the Linux kernel before 2.6.28 does not properly handle processes that make exec system calls, which allows local users to cause a denial of service or possibly gain privileges by writing to a memory location in a child process.
ftp.osuosl.org/pub/linux/kernel/v2.6/ChangeLog-2.6.28
git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=8141c7f3e7aee618312fa1c15109e1219de784a7
www.openwall.com/lists/oss-security/2012/05/08/1
bugzilla.redhat.com/show_bug.cgi?id=771764
github.com/torvalds/linux/commit/8141c7f3e7aee618312fa1c15109e1219de784a7