Description
Screen version 5.0.0 and older version 4 releases have a TOCTOU race potentially allowing to send SIGHUP, SIGCONT to privileged processes when installed setuid-root.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | screen | 5.0. – ≤ 5.0.0, ? – ≤ 4.9.1 | — |
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 | screen | 4.9.1-3 | — |
| Debian 13 | screen | 4.9.1-3 | — |
| Debian 12 | screen | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | screen | 4.9.1-1ubuntu1 | USN-7978-1 |
| Ubuntu 22.04 LTS | screen | 4.9.0-1ubuntu0.1 | USN-7978-1 |
| Ubuntu 20.04 LTS | screen | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 18.04 LTS | screen | No fix yet | — |
| Ubuntu Pro 16.04 LTS | screen | No fix yet | — |
| Ubuntu Pro 14.04 LTS | screen | No fix yet | — |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | screen | 5.0.2-1.1 | openSUSE-SU-2026:12373-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | screen | 5.0.1-r0 | — |
| Alpine v3.23 | screen | 5.0.1-r0 | — |
| Alpine v3.22 | screen | 5.0.1-r0 | — |
| Alpine v3.21 | screen | 5.0.1-r0 | — |
| Alpine v3.20 | screen | 4.9.1_git20250512-r0 | — |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | screen | 4.9.1_git20250512-r0 | — |
| Alpine v3.18 | screen | 4.9.1_git20250512-r0 | — |
Advisories 4
- openSUSE-SU-2026:12373-1 screen-5.0.2-1.1 on GA media SUSE / openSUSE Security Updates · Oct 31, 2026
- WID-SEC-2025-1034 screen: Mehrere Schwachstellen BSI CERT-Bund (WID) · Aug 26, 2026
- USN-7978-1 screen vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- WID-SEC-2025-1850 Xerox FreeFlow Print Server: Mehrere Schwachstellen ermöglichen nicht spezifizierten Angriff BSI CERT-Bund (WID) · Nov 17, 2025