Description
pkexec, when used with --user nonpriv, allows local users to escape to the parent session via a crafted TIOCSTI ioctl call, which pushes characters to the terminal's input buffer.
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 | policykit-1 | 123-1 | — |
| Debian 13 | policykit-1 | 123-1 | — |
| Debian 12 | policykit-1 | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | policykit-1 | No fix yet | — |
| Ubuntu 26.04 LTS | policykit-1 | No fix yet | — |
| Ubuntu 25.10 | policykit-1 | No fix yet | — |
| Ubuntu 24.04 LTS | policykit-1 | No fix yet | — |
| Ubuntu 22.04 LTS | policykit-1 | No fix yet | — |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | policykit-1 | No fix yet | — |
| Ubuntu 18.04 LTS | policykit-1 | No fix yet | — |
| Ubuntu Pro 16.04 LTS | policykit-1 | No fix yet | — |
| Ubuntu Pro 14.04 LTS | policykit-1 | No fix yet | — |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | polkit | 123-1 | — |
| Azure Linux 2 (CBL-Mariner) | polkit | No fix yet | — |