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Red Hat: CVE-2018-1000200: Important: kernel-alt security, bug fix, and enhancement update (RHSA-2018:2948)

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Red Hat: CVE-2018-1000200: Important: kernel-alt security, bug fix, and enhancement update (RHSA-2018:2948)

Severity
5
CVSS
(AV:L/AC:L/Au:N/C:N/I:N/A:C)
Published
06/05/2018
Created
03/19/2019
Added
10/31/2018
Modified
03/03/2021

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).

Solution(s)

  • redhat-upgrade-kernel

References

  • 104397
  • CVE-2018-1000200
  • RHSA-2018:2948

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