- A
The pod runs a web server listening on port 8080.
Why wrong: Web servers typically use standard system calls that are supported by gVisor.
- B
The pod attempts to mount a hostPath directory with privileged access.
gVisor restricts host access and may not allow privileged hostPath mounts, causing the pod to fail.
- C
The pod mounts a ConfigMap as a volume.
Why wrong: Volume mounts are supported by gVisor.
- D
The pod uses a PersistentVolumeClaim for storage.
Why wrong: PVCs work with gVisor as they go through the storage stack.
Question 850 of 997
Why Does gVisor Reject Privileged Containers?
This CKS practice question tests your understanding of minimize microservice vulnerabilities. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A pod is using a RuntimeClass that specifies gVisor (runsc). Which of the following scenarios is most likely to cause the pod to fail?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"most likely"Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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
✓
The pod attempts to mount a hostPath directory with privileged access.
Option B is correct because gVisor (runsc) operates as a sandboxed kernel that intercepts system calls, and it does not support privileged operations such as mounting hostPath directories with privileged access. The `privileged: true` flag attempts to bypass the sandbox, which gVisor explicitly denies, causing the pod to fail. This is a core security constraint of gVisor, which aims to minimize microservice vulnerabilities by restricting host-level interactions.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The pod runs a web server listening on port 8080.
Why it's wrong here
Web servers typically use standard system calls that are supported by gVisor.
- ✓
The pod attempts to mount a hostPath directory with privileged access.
Why this is correct
gVisor restricts host access and may not allow privileged hostPath mounts, causing the pod to fail.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The pod mounts a ConfigMap as a volume.
Why it's wrong here
Volume mounts are supported by gVisor.
- ✗
The pod uses a PersistentVolumeClaim for storage.
Why it's wrong here
PVCs work with gVisor as they go through the storage stack.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The CKS exam often tests the misconception that gVisor is a lightweight container runtime that allows all standard operations, but the trap here is that `privileged: true` and hostPath mounts are fundamentally incompatible with gVisor's sandboxing model, leading to pod failure.
Detailed technical explanation
How to think about this question
Under the hood, gVisor intercepts syscalls via a ptrace or KVM-based platform and implements a Linux kernel in user space (Sentry). When a pod requests `privileged: true`, the container runtime attempts to disable seccomp and AppArmor, but gVisor's runsc ignores this and enforces its own sandbox, rejecting privileged operations like hostPath mounts that require raw block device access or `mount()` syscalls. In a real-world scenario, an attacker exploiting a container escape via hostPath would be blocked by gVisor, but the pod itself would crash-loop if the manifest explicitly requires privileged access.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A junior network technician can log in to a core router but cannot reach the enable prompt or configuration mode. The AAA server is authenticating the login — but the authorisation policy only grants privilege level 1, not 15. Authentication (who you are) is working; authorisation (what you can do) is not.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
- →
Minimize Microservice Vulnerabilities — study guide chapter
Learn the concepts, then practise the questions
- →
Minimize Microservice Vulnerabilities practice questions
Targeted practice on this topic area only
- →
All CKS questions
997 questions across all exam domains
- →
Certified Kubernetes Security Specialist CKS study guide
Full concept coverage aligned to exam objectives
- →
CKS practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Related CKS practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Monitoring Logging and Runtime Security practice questions
Practise CKS questions linked to Monitoring Logging and Runtime Security.
Cluster Setup and Hardening practice questions
Practise CKS questions linked to Cluster Setup and Hardening.
System Hardening practice questions
Practise CKS questions linked to System Hardening.
Minimize Microservice Vulnerabilities practice questions
Practise CKS questions linked to Minimize Microservice Vulnerabilities.
Supply Chain Security practice questions
Practise CKS questions linked to Supply Chain Security.
Monitoring, Logging and Runtime Security practice questions
Practise CKS questions linked to Monitoring, Logging and Runtime Security.
Cluster Setup practice questions
Practise CKS questions linked to Cluster Setup.
Cluster Hardening practice questions
Practise CKS questions linked to Cluster Hardening.
CKS fundamentals practice questions
Practise CKS questions linked to CKS fundamentals.
CKS scenario practice questions
Practise CKS questions linked to CKS scenario.
CKS troubleshooting practice questions
Practise CKS questions linked to CKS troubleshooting.
Practice this exam
Start a free CKS practice session
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
Questions learners often ask
What does this CKS question test?
Minimize Microservice Vulnerabilities — This question tests Minimize Microservice Vulnerabilities — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The pod attempts to mount a hostPath directory with privileged access. — Option B is correct because gVisor (runsc) operates as a sandboxed kernel that intercepts system calls, and it does not support privileged operations such as mounting hostPath directories with privileged access. The `privileged: true` flag attempts to bypass the sandbox, which gVisor explicitly denies, causing the pod to fail. This is a core security constraint of gVisor, which aims to minimize microservice vulnerabilities by restricting host-level interactions.
What should I do if I get this CKS question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Keep practising
More CKS practice questions
- Which flag is used to restrict the kubelet's ability to modify node status and pods?
- A Falco rule has priority `WARNING` and output: `Sensitive file opened (user=%user.name command=%proc.cmdline file=%fd.n…
- Falco detects a shell being opened inside a container. Which Falco rule field is used to specify the syscall condition f…
- A security audit reveals that a ServiceAccount named 'monitor' has a ClusterRoleBinding to the cluster-admin role. What…
- Match each Kubernetes security component to its description.
- Match each Kubernetes certificate type to its usage.
Last reviewed: Jul 4, 2026
This CKS practice question is part of Courseiva's free CNCF 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 CKS exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.