The do_shmat function in ipc/shm.c in the Linux kernel does not restrict the address calculated by a certain rounding operation, which allows local users to map page zero, and consequently bypass a protection mechanism that exists for the mmap system call, by making crafted shmget and shmat system calls in a privileged context. Upstream bug: https://bugzilla.kernel.org/show_bug.cgi?id=192931 Upstream patch: https://github.com/torvalds/linux/commit/e1d35d4dc7f089e6c9c080d556feedf9c706f0c7 https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=95e91b831f87ac8e1f8ed50c14d709089b4e01b8
kernel-4.9.13-101.fc24 has been pushed to the Fedora 24 stable repository. If problems still persist, please make note of it in this bug report.
Statement: This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5, 6, 7 and Red Hat Enterprise MRG-2 as the flaw can only be exploited by a privileged user.