Description
cloud-init through 25.1.2 includes the systemd socket unit cloud-init-hotplugd.socket with default SocketMode that grants 0666 permissions, making it world-writable. This is used for the "/run/cloud-init/hook-hotplug-cmd" FIFO. An unprivileged user could trigger hotplug-hook commands.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Canonical | cloud-init | 21.3 – < 25.1.3 | 25.1.3 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | cloud-init | 25.1.4-1 | — |
| Debian 13 | cloud-init | 25.1.4-1 | — |
| Debian 12 | cloud-init | 22.4.2-1+deb12u3 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | cloud-init | 25.1.4-0ubuntu0~24.04.1 | USN-7677-1 |
| Ubuntu 22.04 LTS | cloud-init | 25.1.4-0ubuntu0~22.04.1 | USN-7677-1 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | cloud-init | 24.4.1-0ubuntu0~20.04.3+esm1 | USN-7677-1 |
| Ubuntu Pro 18.04 LTS | cloud-init | 23.1.2-0ubuntu0~18.04.1+esm1 | USN-7677-1 |
| Ubuntu Pro 16.04 LTS | cloud-init | 21.1-19-gbad84ad4-0ubuntu1~16.04.4+esm2 | USN-7677-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | cloud-init | 25.1.3-160000.2.1 | SUSE-RU-2026:20192-1 |
| SLES 16.0 | cloud-init | 25.1.3-160000.2.1 | SUSE-RU-2026:20192-1 |
| SLE Micro 6.2 | cloud-init | 25.1.3-160000.2.1 | SUSE-RU-2026:20174-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLE Micro 6.1 | cloud-init | 25.1.3-slfo.1.1_1.1 | SUSE-SU-2025:20755-1 |
| SLE Micro 6.0 | cloud-init | 25.1.3-1.1 | SUSE-SU-2025:20656-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | cloud-init | 25.1.3-1.1 | openSUSE-SU-2025:15376-1 |
| openSUSE Leap 16.0 | cloud-init | 25.1.3-160000.2.1 | openSUSE-RU-2026:20129-1 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | cloud-init | 24.3.1-2 | — |
| Azure Linux 2 (CBL-Mariner) | cloud-init | 23.3-7 | — |
Advisories 7
- USN-7677-1 cloud-init vulnerabilities Ubuntu Security Notices (USN) · Jun 25, 2026
- openSUSE-RU-2026:20129-1 Recommended update for cloud-init SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:20755-1 Security update for cloud-init SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:20656-1 Security update for cloud-init SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-RU-2026:20192-1 Recommended update for cloud-init SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-RU-2026:20174-1 Recommended update for cloud-init SUSE / openSUSE Security Updates · Mar 23, 2026
- openSUSE-SU-2025:15376-1 cloud-init-25.1.3-1.1 on GA media SUSE / openSUSE Security Updates · Jul 25, 2025