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NULL Pointer Dereference Affecting ocfs2-kmp-default package, versions <4.12.14-25.3.1

Severity

 Recommended
0.0
medium
0
10

Based on SUSE Linux Enterprise Server security rating.

Threat Intelligence

EPSS
0.06% (29th percentile)

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  • Snyk IDSNYK-SLES150-OCFS2KMPDEFAULT-2761275
  • published14 Apr 2022
  • disclosed27 Jul 2018
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Introduced: 27 Jul 2018

CVE-2018-1000200  (opens in a new tab)
CWE-476  (opens in a new tab)

How to fix?

Upgrade SLES:15.0 ocfs2-kmp-default to version 4.12.14-25.3.1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream ocfs2-kmp-default package and not the ocfs2-kmp-default package as distributed by SLES. See How to fix? for SLES:15.0 relevant fixed versions and status.

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).