Flaws in the way the Linux kernel (and some other kernels, such as FreeBSD's) process TCP networking have been discovered. The issue could be used by attackers to crash or otherwise disrupt a system that accepts TCP connections (which most servers and many workstations do). Patches to fix these flaws are available and many distributions have already fixed the issue. Red Hat has a detailed write-up on how the networking flaw works and offers steps to workaround the bug on machines that do not yet have the fix.
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