CVE-2018-1000200

medium
New! CVE Severity Now Using CVSS v3

The calculated severity for CVEs has been updated to use CVSS v3 by default. CVEs that do not have a CVSS v3 score will fall back CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.

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).

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/

Details

Source: MITRE

Published: 2018-06-05

Updated: 2018-10-31

Type: CWE-476

Risk Information

CVSS v2

Base Score: 4.9

Vector: AV:L/AC:L/Au:N/C:N/I:N/A:C

Impact Score: 6.9

Exploitability Score: 3.9

Severity: MEDIUM

CVSS v3

Base Score: 5.5

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Impact Score: 3.6

Exploitability Score: 1.8

Severity: MEDIUM

Tenable Plugins

View all (7 total)

IDNameProductFamilySeverity
123226openSUSE Security Update : the Linux Kernel (openSUSE-2019-536) (Spectre)NessusSuSE Local Security Checks
high
120067SUSE SLED15 / SLES15 Security Update : kernel (SUSE-SU-2018:2092-1) (Spectre)NessusSuSE Local Security Checks
high
118513RHEL 7 : kernel-alt (RHSA-2018:2948) (Spectre)NessusRed Hat Local Security Checks
high
112189Ubuntu 16.04 LTS / 18.04 LTS : Linux kernel (Azure, GCP, OEM) vulnerabilities (USN-3752-3)NessusUbuntu Local Security Checks
high
112110Ubuntu 16.04 LTS : Linux kernel (HWE) vulnerabilities (USN-3752-2)NessusUbuntu Local Security Checks
high
112109Ubuntu 18.04 LTS : Linux kernel vulnerabilities (USN-3752-1)NessusUbuntu Local Security Checks
high
111414openSUSE Security Update : the Linux Kernel (openSUSE-2018-762) (Spectre)NessusSuSE Local Security Checks
high