KCSA Kubernetes Threat Model Practice Question
An attacker gains execution inside a container that has the `CAP_SYS_ADMIN` capability enabled and shares the host's IPC namespace. How does `CAP_SYS_ADMIN` facilitate container escape?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
By permitting system administration operations like mounting host filesystems and manipulating cgroups
CAP_SYS_ADMIN is a powerful capability that grants privileges similar to root across many subsystem operations, including mounting filesystems, manipulating cgroups, and interacting with core kernel features that often lead to escape.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
By encrypting all network traffic traversing the CNI plugin bridge
Why it's wrong here
Capabilities do not provide network packet encryption.
- ✓
By permitting system administration operations like mounting host filesystems and manipulating cgroups
Why this is correct
CAP_SYS_ADMIN bypasses numerous kernel safety checks, allowing actions like mount() system calls that enable escaping the container namespace confinement.
- ✗
By enabling automated horizontal scaling of replica sets
Why it's wrong here
Scaling is handled by control plane controllers, not kernel capabilities.
- ✗
By automatically granting cluster-admin Kubernetes RBAC permissions
Why it's wrong here
Capabilities are Linux kernel constructs and have no direct correlation with Kubernetes RBAC roles.
About these practice questions
One of 320 original KCSA practice questions on Courseiva, each with a full explanation and wrong-answer analysis — not exam dumps or protected exam content. Learn why practice questions differ from exam dumps →
JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official CNCF / Linux Foundation exam blueprint
This KCSA practice question is part of Courseiva's free CNCF / Linux Foundation certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the KCSA exam.