Default context and builder are broken when "Allow the default Docker socket to be used" is disabled

[gwynne]

Description

If the default Docker socket, i.e. /var/run/docker.sock, is disabled in the Advanced settings of Docker Desktop, the default builder and context (docker context inspect default, docker buildx inspect default) becomes unusable, as its endpoint is set to the default socket. Since the default context cannot be reconfigured, this error is unfixable save by enabling the socket, which is undesirable for security.

Reproduce

1. Uncheck the "Allow the default Docker socket to be used" setting in the Advanced tab of the Docker Desktop settings and Apply.
2. Run docker context inspect default or docker buildx inspect default.

Expected behavior

The defaut context's endpoint should be updated when this setting changes.

docker version

Client:
 Version:           29.2.0
 API version:       1.53
 Go version:        go1.25.6
 Git commit:        0b9d198
 Built:             Mon Jan 26 19:25:13 2026
 OS/Arch:           darwin/arm64
 Context:           desktop-linux

Server: Docker Desktop 4.60.1 (218372)
 Engine:
  Version:          29.2.0
  API version:      1.53 (minimum version 1.44)
  Go version:       go1.25.6
  Git commit:       9c62384
  Built:            Mon Jan 26 19:25:48 2026
  OS/Arch:          linux/arm64
  Experimental:     false
 containerd:
  Version:          v2.2.1
  GitCommit:        dea7da592f5d1d2b7755e3a161be07f43fad8f75
 runc:
  Version:          1.3.4
  GitCommit:        v1.3.4-0-gd6d73eb8
 docker-init:
  Version:          0.19.0
  GitCommit:        de40ad0

docker info

Client:
 Version:    29.2.0
 Context:    desktop-linux
 Debug Mode: false
 Plugins:
  ai: Docker AI Agent - Ask Gordon (Docker Inc.)
    Version:  v1.17.2
    Path:     /Users/gwynne/.docker/cli-plugins/docker-ai
  buildx: Docker Buildx (Docker Inc.)
    Version:  v0.31.1-desktop.1
    Path:     /Users/gwynne/.docker/cli-plugins/docker-buildx
  compose: Docker Compose (Docker Inc.)
    Version:  v5.0.2
    Path:     /Users/gwynne/.docker/cli-plugins/docker-compose
  debug: Get a shell into any image or container (Docker Inc.)
    Version:  0.0.47
    Path:     /Users/gwynne/.docker/cli-plugins/docker-debug
  desktop: Docker Desktop commands (Docker Inc.)
    Version:  v0.3.0
    Path:     /Users/gwynne/.docker/cli-plugins/docker-desktop
  extension: Manages Docker extensions (Docker Inc.)
    Version:  v0.2.31
    Path:     /Users/gwynne/.docker/cli-plugins/docker-extension
  init: Creates Docker-related starter files for your project (Docker Inc.)
    Version:  v1.4.0
    Path:     /Users/gwynne/.docker/cli-plugins/docker-init
  mcp: Docker MCP Plugin (Docker Inc.)
    Version:  v0.38.0
    Path:     /Users/gwynne/.docker/cli-plugins/docker-mcp
  model: Docker Model Runner (Docker Inc.)
    Version:  v1.0.8
    Path:     /Users/gwynne/.docker/cli-plugins/docker-model
  offload: Docker Offload (Docker Inc.)
    Version:  v0.5.42
    Path:     /Users/gwynne/.docker/cli-plugins/docker-offload
  pass: Docker Pass Secrets Manager Plugin (beta) (Docker Inc.)
    Version:  v0.0.24
    Path:     /Users/gwynne/.docker/cli-plugins/docker-pass
  sandbox: Docker Sandbox (Docker Inc.)
    Version:  v0.11.0
    Path:     /Users/gwynne/.docker/cli-plugins/docker-sandbox
  sbom: View the packaged-based Software Bill Of Materials (SBOM) for an image (Anchore Inc.)
    Version:  0.6.0
    Path:     /Users/gwynne/.docker/cli-plugins/docker-sbom
  scout: Docker Scout (Docker Inc.)
    Version:  v1.19.0
    Path:     /Users/gwynne/.docker/cli-plugins/docker-scout

Server:
 Containers: 0
  Running: 0
  Paused: 0
  Stopped: 0
 Images: 0
 Server Version: 29.2.0
 Storage Driver: stargz
  driver-type: io.containerd.snapshotter.v1
 Logging Driver: json-file
 Cgroup Driver: cgroupfs
 Cgroup Version: 2
 Plugins:
  Volume: local
  Network: bridge host ipvlan macvlan null overlay
  Log: awslogs fluentd gcplogs gelf journald json-file local splunk syslog
 CDI spec directories:
  /etc/cdi
  /var/run/cdi
 Discovered Devices:
  cdi: docker.com/gpu=webgpu
 Swarm: inactive
 Runtimes: io.containerd.runc.v2 runc
 Default Runtime: runc
 Init Binary: docker-init
 containerd version: dea7da592f5d1d2b7755e3a161be07f43fad8f75
 runc version: v1.3.4-0-gd6d73eb8
 init version: de40ad0
 Security Options:
  seccomp
   Profile: builtin
  cgroupns
 Kernel Version: 6.12.67-linuxkit
 Operating System: Docker Desktop
 OSType: linux
 Architecture: aarch64
 CPUs: 9
 Total Memory: 23.43GiB
 Name: docker-desktop
 ID: 732ceb36-57b2-4414-af8a-a58f5a552dc4
 Docker Root Dir: /var/lib/docker
 Debug Mode: false
 HTTP Proxy: http.docker.internal:3128
 HTTPS Proxy: http.docker.internal:3128
 No Proxy: hubproxy.docker.internal
 Labels:
  com.docker.desktop.address=unix:///Users/gwynne/Library/Containers/com.docker.docker/Data/docker-cli.sock
 Experimental: false
 Insecure Registries:
  hubproxy.docker.internal:5555
  ::1/128
  127.0.0.0/8
 Live Restore Enabled: false
 Firewall Backend: iptables

Diagnostics ID

CEC81793-5002-4A5E-9D37-5B165C9B772A

Additional Info

No response