The do_shmat function in ipc/shm.c in the Linux kernel through 4.9.12 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.
CPE | Name | Operator | Version |
---|---|---|---|
ubuntu_linux | eq | 12.04 | |
ubuntu_linux | eq | 14.04 | |
debian_linux | eq | 8.0 | |
linux_kernel | lt | 4.11 |
www.debian.org/security/2017/dsa-3804
www.securityfocus.com/bid/96754
www.securitytracker.com/id/1037918
bugzilla.kernel.org/show_bug.cgi?id=192931
github.com/torvalds/linux/commit/95e91b831f87ac8e1f8ed50c14d709089b4e01b8
github.com/torvalds/linux/commit/e1d35d4dc7f089e6c9c080d556feedf9c706f0c7
usn.ubuntu.com/3583-1/
usn.ubuntu.com/3583-2/