CVE-2018-1000200

Severity: medium (CVSS 5.5 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2018-06-05 · updated 2026-06-17
Weakness: CWE-476

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).

Affected products

Linux kernel: 4.14, 4.15, 4.16

References

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/
http://seclists.org/oss-sec/2018/q2/67
http://www.securityfocus.com/bid/104397

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