CVE-2023-24626
screen: allows sending SIGHUP to arbitrary PIDs
Severity
ModerateRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · April 8, 2023
Updated · November 21, 2025
Description
A flaw was found in screen. This flaw allows local users to send a SIGHUP signal to any PID due to a missing signal sending permission check, potentially resulting in a denial of service or disruption of the target process.
Statement
The screen binary as shipped with Red Hat Enterprise Linux is installed with the set-group-ID mode bit set. However, the binary's group is set to screen and not root, limiting the security impact of this issue. The screen package is not shipped in Red Hat Enterprise Linux 8 and 9. Therefore, these versions of RHEL are not affected by this flaw and are not listed in the Affected Packages list below.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.1 · 6.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
CWE-862 · Missing Authorization