Overview
- 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).
- Source
- cve@mitre.org
- NVD status
- Modified
Risk scores
CVSS 3.0
- Type
- Primary
- Base score
- 5.5
- Impact score
- 3.6
- Exploitability score
- 1.8
- Vector string
- CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Severity
- MEDIUM
CVSS 2.0
- Type
- Primary
- Base score
- 4.9
- Impact score
- 6.9
- Exploitability score
- 3.9
- Vector string
- AV:L/AC:L/Au:N/C:N/I:N/A:C
Weaknesses
- nvd@nist.gov
- CWE-476
Social media
- Hype score
- Not currently trending
Configurations
[
{
"nodes": [
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:4.14:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "D31DCD50-805F-4CC6-9A98-2AC8BC224DF6"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:4.15:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "380E55F5-238D-4FBB-8DB1-DB10EFC37CD0"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:4.16:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "A63F7D1D-EB47-48AE-B89E-E84A63579FA6"
}
],
"operator": "OR"
}
]
}
]