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.

Metrics

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Attack Requirements Present

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation none

Automatable no

Technical Impact partial

Affected Vendors & Products

No data.

No data.

No data.

References
Link Providers
https://bugzilla.suse.com/show_bug.cgi?id=CVE-2025-46805 cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2025-46805 cve-icon
https://www.cve.org/CVERecord?id=CVE-2025-46805 cve-icon
https://www.openwall.com/lists/oss-security/2025/05/12/1 cve-icon cve-icon
History

Tue, 27 May 2025 14:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Mon, 26 May 2025 13:30:00 +0000

Type Values Removed Values Added
Description A flaw was found in Screen. A possible denial of service caused by race conditions when sending signals exists. The `CheckPid()` function drops privileges to the real user ID and tests whether the kernel can send a signal to the target PID using these credentials. The signal is sent later via `Kill()`, potentially using full root privileges. By this time, the previously checked PID could have been replaced by a different, privileged process. It might also be possible to trick the privileged Screen daemon process into sending signals to itself since a process is always allowed to send signals to itself. 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.
Title screen: Race Conditions when Sending Signals Screen has a TOCTOU race potentially allowing to send SIGHUP, SIGCONT to privileged processes when installed setuid-root
Weaknesses CWE-367
References
Metrics cvssV4_0

{'score': 5.7, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}

Wed, 14 May 2025 02:30:00 +0000

Type Values Removed Values Added
Description A flaw was found in Screen. A possible denial of service caused by race conditions when sending signals exists. The `CheckPid()` function drops privileges to the real user ID and tests whether the kernel can send a signal to the target PID using these credentials. The signal is sent later via `Kill()`, potentially using full root privileges. By this time, the previously checked PID could have been replaced by a different, privileged process. It might also be possible to trick the privileged Screen daemon process into sending signals to itself since a process is always allowed to send signals to itself.
Title screen: Race Conditions when Sending Signals
Weaknesses CWE-362
References
Metrics threat_severity

None

 cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

threat_severity

Moderate
cve-icon MITRE

Status: PUBLISHED

Assigner: suse

Published: 2025-05-26T13:16:40.969Z

Updated: 2025-05-27T14:10:49.034Z

Reserved: 2025-04-30T11:28:04.728Z

Link: CVE-2025-46805

cve-icon Vulnrichment

Updated: 2025-05-27T14:10:41.871Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2025-05-26T14:15:20.037

Modified: 2025-05-28T15:01:30.720

Link: CVE-2025-46805

cve-icon Redhat

Severity : Moderate

Publid Date: 2025-05-12T00:00:00Z

Links: CVE-2025-46805 - Bugzilla