Description
An issue was discovered in Icinga 2.x through 2.8.1. The daemon creates an icinga2.pid file after dropping privileges to a non-root account, which might allow local users to kill arbitrary processes by leveraging access to this non-root account for icinga2.pid modification before a root script executes a "kill `cat /pathname/icinga2.pid`" command, as demonstrated by icinga2.init.d.cmake.
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 | icinga2 | 2.8.4-1 | — |
| Debian 13 | icinga2 | 2.8.4-1 | — |
| Debian 12 | icinga2 | 2.8.4-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | icinga2 | No fix yet | — |
| Ubuntu 26.04 LTS | icinga2 | No fix yet | — |
| Ubuntu 25.10 | icinga2 | No fix yet | — |
| Ubuntu 24.04 LTS | icinga2 | No fix yet | — |
| Ubuntu 22.04 LTS | icinga2 | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | icinga2 | No fix yet | — |
| Ubuntu 18.04 LTS | icinga2 | No fix yet | — |
| Ubuntu 16.04 LTS | icinga2 | No fix yet | — |