The m_stop function in fs/proc/task_mmu.c in the Linux kernel before 2.6.39 allows local users to cause a denial of service (OOPS) via vectors that trigger an m_start error.
ftp.osuosl.org/pub/linux/kernel/v2.6/ChangeLog-2.6.39
git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=76597cd31470fa130784c78fadb4dab2e624a723
www.openwall.com/lists/oss-security/2012/02/06/1
bugzilla.redhat.com/show_bug.cgi?id=747848
github.com/torvalds/linux/commit/76597cd31470fa130784c78fadb4dab2e624a723