UBUNTU-CVE-2018-1000200

Dashboard / Vulnerabilities / UBUNTU-CVE-2018-1000200

UBUNTU-CVE-2018-1000200

Summary:

Details: 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).

References: https://ubuntu.com/security/CVE-2018-1000200, http://openwall.com/lists/oss-security/2018/04/24/3, https://ubuntu.com/security/notices/USN-3752-1, https://ubuntu.com/security/notices/USN-3752-2, https://ubuntu.com/security/notices/USN-3752-3, https://www.cve.org/CVERecord?id=CVE-2018-1000200