What’s old is new again: an exploit protection mechanism for a known flaw in the Linux kernel has fallen to a new attack targeting an old problem. The so-called Stack Clash vulnerability, which was discovered and disclosed by Qualys, affects Linux, OpenBSD, NetBSD, FreeBSD, and Solaris, on i386 and amd64 processors. These platforms earlier this week received patches for the vulnerability, a memory management flaw in the Linux kernel that could allow attackers to bypass security controls previously put in place to prevent memory management attacks on Linux-based servers, appliances, and even Internet of Things devices.