CVE-2018-1000200 Information

Description

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).

CVSS Vector

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Reference

http://seclists.org/oss-sec/2018/q2/67 http://www.securityfocus.com/bid/104397 https://access.redhat.com/errata/RHSA-2018:2948 https://access.redhat.com/security/cve/cve-2018-1000200 https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=27ae357fa82be5ab73b2ef8d39dcb8ca2563483a https://marc.info/?l=linux-kernel&m=152400522806945 https://marc.info/?l=linux-kernel&m=152460926619256 https://usn.ubuntu.com/3752-1/ https://usn.ubuntu.com/3752-2/ https://usn.ubuntu.com/3752-3/

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

NONE

Base Score

HIGH

Base Severity

5.5