Linux Kernel 4.14/4.15/4.16 exit_mmap null pointer dereference

CVSS Meta Temp Score
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CTI Interest Score
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4.3$0-$5k0.00

Summaryinfo

A vulnerability identified as problematic has been detected in Linux Kernel 4.14/4.15/4.16. Affected is the function exit_mmap. Performing a manipulation results in null pointer dereference. This vulnerability was named CVE-2018-1000200. The attack needs to be approached locally. There is no available exploit. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic has been found in Linux Kernel 4.14/4.15/4.16 (Operating System). This affects the function exit_mmap. The manipulation with an unknown input leads to a null pointer dereference vulnerability. CWE is classifying the issue as CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. This is going to have an impact on availability. The summary by CVE is:

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).

The bug was discovered 04/24/2018. The weakness was presented 06/05/2018 with Google (Website). The advisory is shared at marc.info. This vulnerability is uniquely identified as CVE-2018-1000200 since 04/18/2018. The exploitability is told to be easy. An attack has to be approached locally. No form of authentication is needed for exploitation. Technical details are known, but no exploit is available.

The vulnerability was handled as a non-public zero-day exploit for at least 42 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 111414 (openSUSE Security Update : the Linux Kernel (openSUSE-2018-762) (Spectre)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family SuSE Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 197240 (Ubuntu Security Notification for Linux, Linux-aws, Linux-gcp, Linux-kvm, Linux-raspi2 Vulnerabilities (USN-3752-1)).

Upgrading eliminates this vulnerability. A possible mitigation has been published 2 months after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (111414) and SecurityFocus (BID 104397†). See VDB-118176, VDB-120004 and VDB-121521 for similar entries. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.4
VulDB Meta Temp Score: 4.3

VulDB Base Score: 3.3
VulDB Temp Score: 3.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 111414
Nessus Name: openSUSE Security Update : the Linux Kernel (openSUSE-2018-762) (Spectre)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Patch: git.kernel.org

Timelineinfo

04/18/2018 🔍
04/24/2018 +6 days 🔍
04/24/2018 +0 days 🔍
06/05/2018 +41 days 🔍
06/05/2018 +0 days 🔍
06/05/2018 +0 days 🔍
07/28/2018 +53 days 🔍
07/30/2018 +2 days 🔍
03/21/2023 +1695 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: RHSA-2018:2948
Organization: Google
Status: Not defined
Confirmation: 🔍

CVE: CVE-2018-1000200 (🔍)
GCVE (CVE): GCVE-0-2018-1000200
GCVE (VulDB): GCVE-100-118953
SecurityFocus: 104397 - Linux Kernel CVE-2018-1000200 Local Denial of Service Vulnerability

See also: 🔍

Entryinfo

Created: 06/05/2018 22:03
Updated: 03/21/2023 15:29
Changes: 06/05/2018 22:03 (76), 02/15/2020 08:34 (6), 03/21/2023 15:29 (5)
Complete: 🔍
Cache ID: 216:E63:103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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