Description
A security feature bypass exists in Azure SSH Keypairs, due to a change in the provisioning logic for some Linux images that use cloud-init, aka 'Azure SSH Keypairs Security Feature Bypass Vulnerability'.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Microsoft | Ubuntu Server | 18.04-LTS | — |
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 | 18.3-6 | — |
| Debian 13 | cloud-init | 18.3-6 | — |
| Debian 12 | cloud-init | 18.3-6 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | cloud-init | 18.5-45-g3554ffe8-0ubuntu1~18.04.1 | — |
| Ubuntu 16.04 LTS | cloud-init | 18.5-45-g3554ffe8-0ubuntu1~16.04.1 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | cloud-init | 18.5-1.el8.4 | RHBA-2019:1992 |
| RHEL 7 | cloud-init | 18.2-1.el7_6.2 | RHSA-2019:0597 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP1 | cloud-init | 19.2-8.11.1 | SUSE-SU-2019:3096-1 |
| SLES 15 | cloud-init | 19.2-5.18.1 | SUSE-SU-2019:3097-1 |
| SLES 12 | cloud-init | 19.2-37.33.1 | SUSE-SU-2019:3191-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | cloud-init | 21.2-1.2 | openSUSE-SU-2024:10688-1 |
| openSUSE Leap 15.1 | cloud-init | 19.2-lp151.2.9.1 | openSUSE-SU-2019:2633-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | cloud-init | 19.3-2.amzn2 | ALAS2-2021-1595 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | cloud-init | 18.2-1.0.1.el7_6.2 | ELSA-2019-0597 |
Advisories 9
- RHSA-2019:0597 Red Hat Security Advisory: cloud-init security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- openSUSE-SU-2019:2633-1 Security update for cloud-init SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:3096-1 Security update for cloud-init SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:3097-1 Security update for cloud-init SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:3191-1 Security update for cloud-init SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:10688-1 cloud-init-21.2-1.2 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- RHBA-2019:1992 Red Hat Bug Fix Advisory: cloud-init bug fix and enhancement update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- ALAS2-2021-1595 Moderate: cloud-init security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Feb 19, 2021
- ELSA-2019-0597 Moderate: cloud-init security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Mar 18, 2019