// For flags

CVE-2019-19922

kernel: when cpu.cfs_quota_us is used allows attackers to cause a denial of service against non-cpu-bound applications

Severity Score

5.5
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

1
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

kernel/sched/fair.c in the Linux kernel before 5.3.9, when cpu.cfs_quota_us is used (e.g., with Kubernetes), allows attackers to cause a denial of service against non-cpu-bound applications by generating a workload that triggers unwanted slice expiration, aka CID-de53fd7aedb1. (In other words, although this slice expiration would typically be seen with benign workloads, it is possible that an attacker could calculate how many stray requests are required to force an entire Kubernetes cluster into a low-performance state caused by slice expiration, and ensure that a DDoS attack sent that number of stray requests. An attack does not affect the stability of the kernel; it only causes mismanagement of application execution.)

El archivo kernel/sched/fair.c en el kernel de Linux versiones anteriores a 5.3.9, cuando la función cpu.cfs_quota_us es usada (por ejemplo, con Kubernetes), permite a atacantes causar una denegación de servicio contra aplicaciones no vinculadas a la CPU al generar una carga de trabajo que desencadena vencimiento de corte no deseado, también se conoce como CID-de53fd7aedb1. (En otras palabras, aunque esta caducidad de corte se vería típicamente con cargas de trabajo benignas, es posible que un atacante pueda calcular cuántas peticiones extraviadas se requieren para forzar a un clúster Kubernetes completo a un estado de bajo rendimiento causado por la caducidad de corte, y garantizar que un ataque DDoS envió esa cantidad de peticiones perdidas. Un ataque no afecta la estabilidad del kernel; solo causa una gestión inapropiada de una ejecución de la aplicación).

A flaw was found in the Linux kernel’s scheduler, where it can allow attackers to cause a denial of service against non-CPU-bound applications by generating a workload that triggers unwanted scheduling slice expiration. A local attacker who can trigger a specific workload type could abuse this technique to trigger a system to be seen as degraded, and possibly trigger workload-rebalance in systems that use the slice-expiration metric as a measure of system health.

*Credits: N/A
CVSS Scores
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Attack Vector
Local
Attack Complexity
Low
Authentication
None
Confidentiality
None
Integrity
None
Availability
Partial
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2019-12-22 CVE Reserved
  • 2019-12-22 CVE Published
  • 2023-08-21 EPSS Updated
  • 2024-08-05 CVE Updated
  • 2024-08-05 First Exploit
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
CWE
  • CWE-400: Uncontrolled Resource Consumption
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Linux
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Linux Kernel
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< 5.3.9
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-
Affected
Oracle
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Sd-wan Edge
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8.2
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-
Affected
Canonical
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Ubuntu Linux
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18.04
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lts
Affected
Canonical
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Ubuntu Linux
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19.04
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-
Affected
Debian
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Debian Linux
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8.0
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-
Affected
Netapp
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Active Iq Unified Manager
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-vmware_vsphere
Affected
Netapp
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Cloud Backup
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--
Affected
Netapp
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Data Availability Services
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--
Affected
Netapp
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E-series Santricity Os Controller
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>= 11.0 <= 11.70.2
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-
Affected
Netapp
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Fas\/aff Baseboard Management Controller
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--
Affected
Netapp
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Hci Baseboard Management Controller
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h610s
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-
Affected
Netapp
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Solidfire \& Hci Management Node
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--
Affected
Netapp
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Steelstore Cloud Integrated Storage
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--
Affected
Netapp
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Aff Baseboard Management Controller
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a700
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-
Affected
Netapp
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Solidfire Baseboard Management Controller
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--
Affected