- A
Apply a NetworkPolicy to block egress traffic from the Pod
Why wrong: Network policy cannot mitigate a local library vulnerability.
- B
Apply a custom seccomp profile that blocks the vulnerable syscall
Seccomp can filter system calls, directly mitigating exploitation of syscall-related CVEs.
- C
Apply an AppArmor profile to the Pod
Why wrong: AppArmor can restrict file access but might not block the specific syscall needed for the CVE.
- D
Use a PodSecurityPolicy to drop all capabilities
Why wrong: Dropping capabilities does not address a system library CVE.
Question 205 of 997
Temporary Mitigation for Container Vulnerability Using Custom Seccomp Profile
This CKS practice question tests your understanding of minimize microservice vulnerabilities. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 security scanner reports that a microservice container image contains a critical vulnerability (CVE-2024-1234) in a system library. The team cannot immediately rebuild the image. What is the most effective temporary mitigation at the Kubernetes level?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"immediately / without restart"Why it matters: Time or reboot constraint — the correct answer must take effect right away without requiring a reboot or reload.
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
✓
Apply a custom seccomp profile that blocks the vulnerable syscall
Option B is correct because a custom seccomp (secure computing mode) profile can restrict the system calls (syscalls) a container is allowed to make. By blocking the specific vulnerable syscall exploited by CVE-2024-1234, you can prevent the vulnerability from being triggered at runtime without rebuilding the image. This is a temporary, Kubernetes-native mitigation that directly addresses the attack vector at the syscall level.
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.
- ✗
Apply a NetworkPolicy to block egress traffic from the Pod
Why it's wrong here
Network policy cannot mitigate a local library vulnerability.
- ✓
Apply a custom seccomp profile that blocks the vulnerable syscall
Why this is correct
Seccomp can filter system calls, directly mitigating exploitation of syscall-related CVEs.
Clue confirmation
The clue word "immediately / without restart" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Apply an AppArmor profile to the Pod
Why it's wrong here
AppArmor can restrict file access but might not block the specific syscall needed for the CVE.
- ✗
Use a PodSecurityPolicy to drop all capabilities
Why it's wrong here
Dropping capabilities does not address a system library CVE.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CNCF often tests the distinction between seccomp (syscall filtering) and AppArmor/SELinux (MAC on files and capabilities), leading candidates to confuse AppArmor as a syscall blocker when it is not.
Detailed technical explanation
How to think about this question
Seccomp works by intercepting syscalls and applying a BPF (Berkeley Packet Filter) program to allow or deny them based on a profile (e.g., a JSON file). A custom profile can be applied via the `securityContext.seccompProfile` field in a Pod spec, using `type: Localhost` and pointing to a profile that denies the specific syscall number (e.g., `syscall: ["open_by_handle_at"]`). In a real-world scenario, if CVE-2024-1234 exploits a syscall like `io_uring_enter`, a custom seccomp profile can block it while allowing all other legitimate syscalls, minimizing disruption.
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 practitioner preparing for the CKS exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
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.
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Minimize Microservice Vulnerabilities — study guide chapter
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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: Apply a custom seccomp profile that blocks the vulnerable syscall — Option B is correct because a custom seccomp (secure computing mode) profile can restrict the system calls (syscalls) a container is allowed to make. By blocking the specific vulnerable syscall exploited by CVE-2024-1234, you can prevent the vulnerability from being triggered at runtime without rebuilding the image. This is a temporary, Kubernetes-native mitigation that directly addresses the attack vector at the syscall level.
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: "immediately / without restart". Time or reboot constraint — the correct answer must take effect right away without requiring a reboot or reload.
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 →
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Last reviewed: Jun 30, 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.
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