Null Pointer Dereference Vulnerability in Linux Kernel 4.14, 4.15, and 4.16

CVE-2018-1000200 · MEDIUM Severity

AV:L/AC:L/AU:N/C:N/I:N/A:C

The Linux Kernel versions 4.14, 4.15, and 4.16 has a null pointer dereference which can result in an out of memory (OOM) killing of large mlocked processes. The issue arises from an oom killed process's final thread calling exit_mmap(), which calls munlock_vma_pages_all() for mlocked vmas.This can happen synchronously with the oom reaper's unmap_page_range() since the vma's VM_LOCKED bit is cleared before munlocking (to determine if any other vmas share the memory and are mlocked).

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