Linux Kernel up to 4.20.1 kernel/sched/fair.c update_blocked_averages resource consumption
CVSS Meta Temp Score | Current Exploit Price (≈) | CTI Interest Score |
---|---|---|
8.4 | $0-$5k | 0.00 |
A vulnerability was found in Linux Kernel up to 4.20.1 (Operating System). It has been classified as critical. Affected is the function update_blocked_averages
of the file kernel/sched/fair.c. The manipulation with an unknown input leads to a resource consumption vulnerability. CWE is classifying the issue as CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:
In the Linux kernel before 4.20.2, kernel/sched/fair.c mishandles leaf cfs_rq's, which allows attackers to cause a denial of service (infinite loop in update_blocked_averages) or possibly have unspecified other impact by inducing a high load.
The bug was discovered 12/30/2018. The weakness was published 02/22/2019 (Website). The advisory is shared for download at access.redhat.com. This vulnerability is traded as CVE-2018-20784 since 02/22/2019. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1499.
The vulnerability was handled as a non-public zero-day exploit for at least 54 days. During that time the estimated underground price was around $5k-$25k.
Upgrading to version 4.20.2 eliminates this vulnerability.
Similar entry is available at 131104.
Product
Type
Vendor
Name
Version
License
CPE 2.3
CPE 2.2
CVSSv4
VulDB CVSS-B Score: 🔍VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍
CVSSv3
VulDB Meta Base Score: 8.5VulDB Meta Temp Score: 8.4
VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔍
VulDB Reliability: 🔍
NVD Base Score: 9.8
NVD Vector: 🔍
CVSSv2
AV | AC | Au | C | I | A |
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💳 | 💳 | 💳 | 💳 | 💳 | 💳 |
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Vector | Complexity | Authentication | Confidentiality | Integrity | Availability |
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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: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍
NVD Base Score: 🔍
Exploiting
Class: Resource consumptionCWE: CWE-400 / CWE-404
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 |
Threat Intelligence
Interest: 🔍Active Actors: 🔍
Active APT Groups: 🔍
Countermeasures
Recommended: UpgradeStatus: 🔍
0-Day Time: 🔍
Upgrade: Kernel 4.20.2
Patch: git.kernel.org
Timeline
12/30/2018 🔍02/22/2019 🔍
02/22/2019 🔍
02/23/2019 🔍
07/19/2023 🔍
Sources
Vendor: kernel.orgAdvisory: RHSA-2019:1959
Status: Not defined
CVE: CVE-2018-20784 (🔍)
See also: 🔍
Entry
Created: 02/23/2019 07:54Updated: 07/19/2023 08:41
Changes: 02/23/2019 07:54 (61), 05/12/2020 09:28 (2), 07/19/2023 08:41 (5)
Complete: 🔍
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