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KCNA · Question #217

Which of the following capabilities are you allowed to add to a container using the Restricted policy?

The correct answer is D. NET_BIND_SERVICE. Under a Restricted Pod Security Standard policy, containers are typically allowed the NET_BIND_SERVICE capability to enable binding to privileged ports, while more sensitive capabilities are disallowed.

Submitted by packet_pusher· May 4, 2026Kubernetes Fundamentals

Question

Which of the following capabilities are you allowed to add to a container using the Restricted policy?

Options

  • ACHOWN
  • BSYS_CHROOT
  • CSETUID
  • DNET_BIND_SERVICE

How the community answered

(27 responses)
  • A
    7% (2)
  • C
    4% (1)
  • D
    89% (24)

Why each option

Under a Restricted Pod Security Standard policy, containers are typically allowed the `NET_BIND_SERVICE` capability to enable binding to privileged ports, while more sensitive capabilities are disallowed.

ACHOWN

The `CHOWN` capability allows changing file ownership, which is considered a privileged operation and is typically disallowed by a `Restricted` Pod Security policy to prevent unauthorized filesystem modifications.

BSYS_CHROOT

The `SYS_CHROOT` capability allows performing a `chroot` operation, which is a highly privileged action that can be exploited for container escapes and is therefore disallowed by a `Restricted` Pod Security policy.

CSETUID

The `SETUID` capability allows setting arbitrary user IDs, which can be used for privilege escalation within a container and is strictly prohibited by a `Restricted` Pod Security policy.

DNET_BIND_SERVICECorrect

The `NET_BIND_SERVICE` capability allows a process to bind to privileged network ports (below 1024), and it is commonly among the few capabilities explicitly allowed by the Kubernetes `Restricted` Pod Security Standard profile as it's often required for standard application services.

Concept tested: Kubernetes Pod Security Standards capabilities

Source: https://kubernetes.io/docs/concepts/security/pod-security-standards/#restricted

Topics

#Kubernetes Security#Pod Security Standards (PSS)#Linux Capabilities#Container Security

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