Linux Kernel up to 4.14.3 mm/oom_kill.c __oom_reap_task_mm use after free
CVSS Meta Temp Score | Current Exploit Price (≈) | CTI Interest Score |
---|---|---|
4.7 | $0-$5k | 0.00 |
A vulnerability has been found in Linux Kernel up to 4.14.3 (Operating System) and classified as problematic. Affected by this vulnerability is the function __oom_reap_task_mm
of the file mm/oom_kill.c. The manipulation with an unknown input leads to a use after free vulnerability. The CWE definition for the vulnerability is CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:
The __oom_reap_task_mm function in mm/oom_kill.c in the Linux kernel before 4.14.4 mishandles gather operations, which allows attackers to cause a denial of service (TLB entry leak or use-after-free) or possibly have unspecified other impact by triggering a copy_to_user call within a certain time window.
The bug was discovered 11/29/2017. The weakness was shared 02/27/2018 (Website). It is possible to read the advisory at git.kernel.org. This vulnerability is known as CVE-2017-18202 since 02/27/2018. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit.
The vulnerability was handled as a non-public zero-day exploit for at least 90 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 117779 (RHEL 7 : kernel-alt (RHSA-2018:2772)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Red Hat Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 370846 (Linux Kernel 'mm/oom_kill.c' Local Denial of Service Vulnerability).
Upgrading to version 4.14.4 eliminates this vulnerability. A possible mitigation has been published 8 months after the disclosure of the vulnerability.
The vulnerability is also documented in the vulnerability database at Tenable (117779). The entries 113900 and 113901 are related to this item.
Product
Type
Vendor
Name
Version
License
CPE 2.3
CPE 2.2
CVSSv4
VulDB CVSS-B Score: 🔍VulDB CVSS-BT Score: 🔍
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CVSSv3
VulDB Meta Base Score: 4.7VulDB Meta Temp Score: 4.7
VulDB Base Score: 2.5
VulDB Temp Score: 2.4
VulDB Vector: 🔍
VulDB Reliability: 🔍
NVD Base Score: 7.0
NVD Vector: 🔍
CVSSv2
AV | AC | Au | C | I | A |
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💳 | 💳 | 💳 | 💳 | 💳 | 💳 |
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unlock | unlock | unlock | unlock | unlock | unlock |
unlock | unlock | unlock | unlock | unlock | unlock |
unlock | unlock | unlock | unlock | unlock | unlock |
VulDB Base Score: 🔍
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Exploiting
Class: Use after freeCWE: CWE-416 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍
Local: No
Remote: Yes
Availability: 🔍
Status: Not defined
EPSS Score: 🔍
EPSS Percentile: 🔍
Price Prediction: 🔍
Current Price Estimation: 🔍
0-Day | unlock | unlock | unlock | unlock |
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Today | unlock | unlock | unlock | unlock |
Nessus ID: 117779
Nessus Name: RHEL 7 : kernel-alt (RHSA-2018:2772)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍
Qualys ID: 🔍
Qualys Name: 🔍
Threat Intelligence
Interest: 🔍Active Actors: 🔍
Active APT Groups: 🔍
Countermeasures
Recommended: UpgradeStatus: 🔍
Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍
Upgrade: Kernel 4.14.4
Patch: git.kernel.org
Timeline
11/29/2017 🔍02/27/2018 🔍
02/27/2018 🔍
02/27/2018 🔍
02/27/2018 🔍
02/28/2018 🔍
09/25/2018 🔍
09/27/2018 🔍
02/16/2023 🔍
Sources
Vendor: kernel.orgAdvisory: RHSA-2018:2772
Status: Not defined
CVE: CVE-2017-18202 (🔍)
SecurityFocus: 103161 - Linux Kernel 'mm/oom_kill.c' Local Denial of Service Vulnerability
See also: 🔍
Entry
Created: 02/28/2018 08:11Updated: 02/16/2023 07:41
Changes: 02/28/2018 08:11 (72), 01/09/2020 09:01 (8), 02/16/2023 07:41 (5)
Complete: 🔍
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