Given that it looks like commits were just made 12 days ago (https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/security/keys?id=1d6d167c2ef

Given that it looks like commits were just made 12 days ago (https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/security/keys?id=1d6d167c2efcfe9539d9cffb1a1be9c92e39c2c0 https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux....) or possibly as recently as 38 hours ago (https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/security/keys?id=5807fcaa9bf7dd87241df739161c119cf78a6bc4 https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux....), perhaps only 4.4 has the fix?