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Package "screen"

Name: screen

Description:

terminal multiplexer with VT100/ANSI terminal emulation
Latest version: 4.9.0-1ubuntu0.1
Release: jammy (22.04)
Level: security
Repository: main
Homepage: https://savannah.gnu.org/projects/screen

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APT INSTALL

Other versions of "screen" in Jammy

Repository Area Version
base main 4.9.0-1
updates main 4.9.0-1ubuntu0.1

Changelog

Version: 4.9.0-1ubuntu0.1 2026-01-26 23:40:44 UTC

  screen (4.9.0-1ubuntu0.1) jammy-security; urgency=medium

  * SECURITY UPDATE: can send privileged SIGHUP signals to any process
    - debian/patches/CVE-2023-24626.patch: fix missing signal sending
      permission check on failed query messages in socket.c.
    - CVE-2023-24626
  * SECURITY UPDATE: incorrect PTY permissions
    - debian/patches/CVE-2025-46802.patch: prevent temporary 0666 mode on
      PTYs in attacher.c, screen.c.
    - CVE-2025-46802
  * SECURITY UPDATE: minor information leak
    - debian/patches/CVE-2025-46804.patch: avoid file existence test
      information leaks in screen.c, socket.c.
    - CVE-2025-46804
  * SECURITY UPDATE: TOCTOU allowing to send SIGHUP, SIGCONT
    - debian/patches/CVE-2025-46805.patch: don't send signals with root
      privileges in socket.c.
    - CVE-2025-46805

 -- Marc Deslauriers <email address hidden> Thu, 22 Jan 2026 15:14:32 -0500
CVE-2023-24626 socket.c in GNU Screen through 4.9.0, when installed setuid or setgid (the default on platforms such as Arch Linux and FreeBSD), allows local users t
CVE-2025-46802 For a short time they PTY is set to mode 666, allowing any user on the system to connect to the screen session.
CVE-2025-46804 A minor information leak when running Screen with setuid-root privileges allows unprivileged users to deduce information about a path that would othe
CVE-2025-46805 Screen version 5.0.0 and older version 4 releases have a TOCTOU race potentially allowing to send SIGHUP, SIGCONT to privileged processes when insta


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