Ubuntu 26.04 LTS Inetutils Critical Privilege Escalation DoS CVE-2026-28372
Jun 08, 2026
•
LinuxSecurity Advisories
4 - 7 min read
Topics Covered
Several security issues were fixed in Inetutils.
==========================================================================
Ubuntu Security Notice USN-8387-1
June 04, 2026
inetutils vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 26.04 LTS
- Ubuntu 25.10
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS
Summary:
Several security issues were fixed in Inetutils.
Software Description:
- inetutils: Collection of common network programs
Details:
It was discovered that the Inetutils telnet daemon incorrectly handled
the CREDENTIALS_DIRECTORY environment variable. An attacker could possibly
use this issue to escalate privileges. (CVE-2026-28372)
It was discovered that the Inetutils telnet daemon did not properly
validate buffer bounds when processing LINEMODE SLC suboptions. An attacker
could possibly use this issue to cause a denial of service or execute
arbitrary code. (CVE-2026-32746)
It was discovered that the Inetutils telnet client incorrectly handled the
NEW_ENVIRON SEND USERVAR option. An attacker could possibly use this issue
to read arbitrary environment variables. (CVE-2026-32772)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 26.04 LTS
inetutils-ftp 2:2.7-2ubuntu1.1
inetutils-ftpd 2:2.7-2ubuntu1.1
inetutils-inetd 2:2.7-2ubuntu1.1
inetutils-ping 2:2.7-2ubuntu1.1
inetutils-syslogd 2:2.7-2ubuntu1.1
inetutils-talk 2:2.7-2ubuntu1.1
inetutils-talkd 2:2.7-2ubuntu1.1
inetutils-telnet 2:2.7-2ubuntu1.1
inetutils-telnetd 2:2.7-2ubuntu1.1
inetutils-tools 2:2.7-2ubuntu1.1
inetutils-traceroute 2:2.7-2ubuntu1.1
telnet 0.17+2.7-2ubuntu1.1
telnetd 0.17+2.7-2ubuntu1.1
Ubuntu 25.10
inetutils-ftp 2:2.6-1ubuntu3.2
inetutils-ftpd 2:2.6-1ubuntu3.2
inetutils-inetd 2:2.6-1ubuntu3.2
inetutils-ping 2:2.6-1ubuntu3.2
inetutils-syslogd 2:2.6-1ubuntu3.2
inetutils-talk 2:2.6-1ubuntu3.2
inetutils-talkd 2:2.6-1ubuntu3.2
inetutils-telnet 2:2.6-1ubuntu3.2
inetutils-telnetd 2:2.6-1ubuntu3.2
inetutils-tools 2:2.6-1ubuntu3.2
inetutils-traceroute 2:2.6-1ubuntu3.2
telnet 0.17+2.6-1ubuntu3.2
telnetd 0.17+2.6-1ubuntu3.2
Ubuntu 24.04 LTS
inetutils-ftp 2:2.5-3ubuntu4.2
inetutils-ftpd 2:2.5-3ubuntu4.2
inetutils-inetd 2:2.5-3ubuntu4.2
inetutils-ping 2:2.5-3ubuntu4.2
inetutils-syslogd 2:2.5-3ubuntu4.2
inetutils-talk 2:2.5-3ubuntu4.2
inetutils-talkd 2:2.5-3ubuntu4.2
inetutils-telnet 2:2.5-3ubuntu4.2
inetutils-telnetd 2:2.5-3ubuntu4.2
inetutils-tools 2:2.5-3ubuntu4.2
inetutils-traceroute 2:2.5-3ubuntu4.2
telnet 0.17+2.5-3ubuntu4.2
telnetd 0.17+2.5-3ubuntu4.2
Ubuntu 22.04 LTS
inetutils-ftp 2:2.2-2ubuntu0.2+esm1
Available with Ubuntu Pro
inetutils-ftpd 2:2.2-2ubuntu0.2+esm1
Available with Ubuntu Pro
inetutils-inetd 2:2.2-2ubuntu0.2+esm1
Available with Ubuntu Pro
inetutils-ping 2:2.2-2ubuntu0.2+esm1
Available with Ubuntu Pro
inetutils-syslogd 2:2.2-2ubuntu0.2+esm1
Available with Ubuntu Pro
inetutils-talk 2:2.2-2ubuntu0.2+esm1
Available with Ubuntu Pro
inetutils-talkd 2:2.2-2ubuntu0.2+esm1
Available with Ubuntu Pro
inetutils-telnet 2:2.2-2ubuntu0.2+esm1
Available with Ubuntu Pro
inetutils-telnetd 2:2.2-2ubuntu0.2+esm1
Available with Ubuntu Pro
inetutils-tools 2:2.2-2ubuntu0.2+esm1
Available with Ubuntu Pro
inetutils-traceroute 2:2.2-2ubuntu0.2+esm1
Available with Ubuntu Pro
Ubuntu 20.04 LTS
inetutils-ftp 2:1.9.4-11ubuntu0.2+esm4
Available with Ubuntu Pro
inetutils-ftpd 2:1.9.4-11ubuntu0.2+esm4
Available with Ubuntu Pro
inetutils-inetd 2:1.9.4-11ubuntu0.2+esm4
Available with Ubuntu Pro
inetutils-ping 2:1.9.4-11ubuntu0.2+esm4
Available with Ubuntu Pro
inetutils-syslogd 2:1.9.4-11ubuntu0.2+esm4
Available with Ubuntu Pro
inetutils-talk 2:1.9.4-11ubuntu0.2+esm4
Available with Ubuntu Pro
inetutils-talkd 2:1.9.4-11ubuntu0.2+esm4
Available with Ubuntu Pro
inetutils-telnet 2:1.9.4-11ubuntu0.2+esm4
Available with Ubuntu Pro
inetutils-telnetd 2:1.9.4-11ubuntu0.2+esm4
Available with Ubuntu Pro
inetutils-tools 2:1.9.4-11ubuntu0.2+esm4
Available with Ubuntu Pro
inetutils-traceroute 2:1.9.4-11ubuntu0.2+esm4
Available with Ubuntu Pro
Ubuntu 18.04 LTS
inetutils-ftp 2:1.9.4-3ubuntu0.1+esm5
Available with Ubuntu Pro
inetutils-ftpd 2:1.9.4-3ubuntu0.1+esm5
Available with Ubuntu Pro
inetutils-inetd 2:1.9.4-3ubuntu0.1+esm5
Available with Ubuntu Pro
inetutils-ping 2:1.9.4-3ubuntu0.1+esm5
Available with Ubuntu Pro
inetutils-syslogd 2:1.9.4-3ubuntu0.1+esm5
Available with Ubuntu Pro
inetutils-talk 2:1.9.4-3ubuntu0.1+esm5
Available with Ubuntu Pro
inetutils-talkd 2:1.9.4-3ubuntu0.1+esm5
Available with Ubuntu Pro
inetutils-telnet 2:1.9.4-3ubuntu0.1+esm5
Available with Ubuntu Pro
inetutils-telnetd 2:1.9.4-3ubuntu0.1+esm5
Available with Ubuntu Pro
inetutils-tools 2:1.9.4-3ubuntu0.1+esm5
Available with Ubuntu Pro
inetutils-traceroute 2:1.9.4-3ubuntu0.1+esm5
Available with Ubuntu Pro
Ubuntu 16.04 LTS
inetutils-ftp 2:1.9.4-1ubuntu0.1~esm6
Available with Ubuntu Pro
inetutils-ftpd 2:1.9.4-1ubuntu0.1~esm6
Available with Ubuntu Pro
inetutils-inetd 2:1.9.4-1ubuntu0.1~esm6
Available with Ubuntu Pro
inetutils-ping 2:1.9.4-1ubuntu0.1~esm6
Available with Ubuntu Pro
inetutils-syslogd 2:1.9.4-1ubuntu0.1~esm6
Available with Ubuntu Pro
inetutils-talk 2:1.9.4-1ubuntu0.1~esm6
Available with Ubuntu Pro
inetutils-talkd 2:1.9.4-1ubuntu0.1~esm6
Available with Ubuntu Pro
inetutils-telnet 2:1.9.4-1ubuntu0.1~esm6
Available with Ubuntu Pro
inetutils-telnetd 2:1.9.4-1ubuntu0.1~esm6
Available with Ubuntu Pro
inetutils-tools 2:1.9.4-1ubuntu0.1~esm6
Available with Ubuntu Pro
inetutils-traceroute 2:1.9.4-1ubuntu0.1~esm6
Available with Ubuntu Pro
Ubuntu 14.04 LTS
inetutils-ftp 2:1.9.2-1ubuntu0.1~esm4
Available with Ubuntu Pro
inetutils-ftpd 2:1.9.2-1ubuntu0.1~esm4
Available with Ubuntu Pro
inetutils-inetd 2:1.9.2-1ubuntu0.1~esm4
Available with Ubuntu Pro
inetutils-ping 2:1.9.2-1ubuntu0.1~esm4
Available with Ubuntu Pro
inetutils-syslogd 2:1.9.2-1ubuntu0.1~esm4
Available with Ubuntu Pro
inetutils-talk 2:1.9.2-1ubuntu0.1~esm4
Available with Ubuntu Pro
inetutils-talkd 2:1.9.2-1ubuntu0.1~esm4
Available with Ubuntu Pro
inetutils-telnet 2:1.9.2-1ubuntu0.1~esm4
Available with Ubuntu Pro
inetutils-telnetd 2:1.9.2-1ubuntu0.1~esm4
Available with Ubuntu Pro
inetutils-tools 2:1.9.2-1ubuntu0.1~esm4
Available with Ubuntu Pro
inetutils-traceroute 2:1.9.2-1ubuntu0.1~esm4
Available with Ubuntu Pro
In general, a standard system update will make all the necessary changes.
References:
https://ubuntu.com/security/notices/USN-8387-1
CVE-2026-28372, CVE-2026-32746, CVE-2026-32772
Package Information:
https://launchpad.net/ubuntu/+source/inetutils/2:2.7-2ubuntu1.1
https://launchpad.net/ubuntu/+source/inetutils/2:2.6-1ubuntu3.2
https://launchpad.net/ubuntu/+source/inetutils/2:2.5-3ubuntu4.2
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Ubuntu 26.04 LTS Inetutils Critical Privilege Escalation DoS CVE-2026-28372
ubuntu
June 8, 2026
Several security issues were fixed in Inetutils.
Summary
A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 26.04 LTS - Ubuntu 25.10 - Ubuntu 24.04 LTS - Ubuntu 22.04 LTS - Ubuntu 20.04 LTS - Ubuntu 18.04 LTS - Ubuntu 16.04 LTS - Ubuntu 14.04 LTS Summary: Several security issues were fixed in Inetutils. Software Description: - inetutils: Collection of common network programs Details: It was discovered that the Inetutils telnet daemon incorrectly handled the CREDENTIALS_DIRECTORY environment variable. An attacker could possibly use this issue to escalate privileges. (CVE-2026-28372) It was discovered that the Inetutils telnet daemon did not properly validate buffer bounds when processing LINEMODE SLC suboptions. An attacker could possibly use this issue to cause a denial of service or execute arbitrary code. (CVE-2026-32746) It was discovered that the Inetutils telnet client incorrectly handled the NEW_ENVIRON SEND USERVAR option. An attacker could possibly use this issue to read arbitrary environment ...
Read the Full Advisory
Topics Covered
Update Instructions
The problem can be corrected by updating your system to the following package versions: Ubuntu 26.04 LTS inetutils-ftp 2:2.7-2ubuntu1.1 inetutils-ftpd 2:2.7-2ubuntu1.1 inetutils-inetd 2:2.7-2ubuntu1.1 inetutils-ping 2:2.7-2ubuntu1.1 inetutils-syslogd 2:2.7-2ubuntu1.1 inetutils-talk 2:2.7-2ubuntu1.1 inetutils-talkd 2:2.7-2ubuntu1.1 inetutils-telnet 2:2.7-2ubuntu1.1 inetutils-telnetd 2:2.7-2ubuntu1.1 inetutils-tools 2:2.7-2ubuntu1.1 inetutils-traceroute 2:2.7-2ubuntu1.1 telnet 0.17+2.7-2ubuntu1.1 telnetd 0.17+2.7-2ubuntu1.1 Ubuntu 25.10 inetutils-ftp 2:2.6-1ubuntu3.2 inetutils-ftpd 2:2.6-1ubuntu3.2 inetutils-inetd 2:2.6-1ubuntu3.2 inetutils-ping 2:2.6-1ubuntu3.2 inetutils-syslogd 2:2.6-1ubuntu3.2 inetutils-talk 2:2.6-1ubuntu3.2 inetutils-talkd 2:2.6-1ubuntu3.2 inetutils-telnet 2:2.6-1ubuntu3.2 inetutils-telnetd 2:2.6-1ubuntu3.2 inetutils-tools 2:2.6-1ubuntu3.2 inetutils-traceroute 2:2.6-1ubuntu3.2 telnet 0.17+2.6-1ubuntu3.2 telnetd 0.17+2.6-1ubuntu3.2 Ubuntu 24.04 LTS inetutils-ftp 2:2.5-3ubuntu4.2 inetutils-ftpd 2:2.5-3ubuntu4.2 inetutils-inetd 2:2.5-3ubuntu4.2 inetutils-ping 2:2.5-3ubuntu4.2 inetutils-syslogd 2:2.5-3ubuntu4.2 inetutils-talk 2:2.5-3ubuntu4.2 inetutils-talkd 2:2.5-3ubuntu4.2 inetutils-telnet 2:2.5-3ubuntu4.2 inetutils-telnetd 2:2.5-3ubuntu4.2 inetutils-tools 2:2.5-3ubuntu4.2 inetutils-traceroute 2:2.5-3ubuntu4.2 telnet 0.17+2.5-3ubuntu4.2 telnetd 0.17+2.5-3ubuntu4.2 Ubuntu 22.04 LTS inetutils-ftp 2:2.2-2ubuntu0.2+esm1 Available with Ubuntu Pro inetutils-ftpd 2:2.2-2ubuntu0.2+esm1 Available with Ubuntu Pro inetutils-inetd 2:2.2-2ubuntu0.2+esm1 Available with Ubuntu Pro inetutils-ping 2:2.2-2ubuntu0.2+esm1 Available with Ubuntu Pro inetutils-syslogd 2:2.2-2ubuntu0.2+esm1 Available with Ubuntu Pro inetutils-talk 2:2.2-2ubuntu0.2+esm1 Available with Ubuntu Pro inetutils-talkd 2:2.2-2ubuntu0.2+esm1 Available with Ubuntu Pro inetutils-telnet 2:2.2-2ubuntu0.2+esm1 Available with Ubuntu Pro inetutils-telnetd 2:2.2-2ubuntu0.2+esm1 Available with Ubuntu Pro inetutils-tools 2:2.2-2ubuntu0.2+esm1 Available with Ubuntu Pro inetutils-traceroute 2:2.2-2ubuntu0.2+esm1 Available with Ubuntu Pro Ubuntu 20.04 LTS inetutils-ftp 2:1.9.4-11ubuntu0.2+esm4 Available with Ubuntu Pro inetutils-ftpd 2:1.9.4-11ubuntu0.2+esm4 Available with Ubuntu Pro inetutils-inetd 2:1.9.4-11ubuntu0.2+esm4 Available with Ubuntu Pro inetutils-ping 2:1.9.4-11ubuntu0.2+esm4 Available with Ubuntu Pro inetutils-syslogd 2:1.9.4-11ubuntu0.2+esm4 Available with Ubuntu Pro inetutils-talk 2:1.9.4-11ubuntu0.2+esm4 Available with Ubuntu Pro inetutils-talkd 2:1.9.4-11ubuntu0.2+esm4 Available with Ubuntu Pro inetutils-telnet 2:1.9.4-11ubuntu0.2+esm4 Available with Ubuntu Pro inetutils-telnetd 2:1.9.4-11ubuntu0.2+esm4 Available with Ubuntu Pro inetutils-tools 2:1.9.4-11ubuntu0.2+esm4 Available with Ubuntu Pro inetutils-traceroute 2:1.9.4-11ubuntu0.2+esm4 Available with Ubuntu Pro Ubuntu 18.04 LTS inetutils-ftp 2:1.9.4-3ubuntu0.1+esm5 Available with Ubuntu Pro inetutils-ftpd 2:1.9.4-3ubuntu0.1+esm5 Available with Ubuntu Pro inetutils-inetd 2:1.9.4-3ubuntu0.1+esm5 Available with Ubuntu Pro inetutils-ping 2:1.9.4-3ubuntu0.1+esm5 Available with Ubuntu Pro inetutils-syslogd 2:1.9.4-3ubuntu0.1+esm5 Available with Ubuntu Pro inetutils-talk 2:1.9.4-3ubuntu0.1+esm5 Available with Ubuntu Pro inetutils-talkd 2:1.9.4-3ubuntu0.1+esm5 Available with Ubuntu Pro inetutils-telnet 2:1.9.4-3ubuntu0.1+esm5 Available with Ubuntu Pro inetutils-telnetd 2:1.9.4-3ubuntu0.1+esm5 Available with Ubuntu Pro inetutils-tools 2:1.9.4-3ubuntu0.1+esm5 Available with Ubuntu Pro inetutils-traceroute 2:1.9.4-3ubuntu0.1+esm5 Available with Ubuntu Pro Ubuntu 16.04 LTS inetutils-ftp 2:1.9.4-1ubuntu0.1~esm6 Available with Ubuntu Pro inetutils-ftpd 2:1.9.4-1ubuntu0.1~esm6 Available with Ubuntu Pro inetutils-inetd 2:1.9.4-1ubuntu0.1~esm6 Available with Ubuntu Pro inetutils-ping 2:1.9.4-1ubuntu0.1~esm6 Available with Ubuntu Pro inetutils-syslogd 2:1.9.4-1ubuntu0.1~esm6 Available with Ubuntu Pro inetutils-talk 2:1.9.4-1ubuntu0.1~esm6 Available with Ubuntu Pro inetutils-talkd 2:1.9.4-1ubuntu0.1~esm6 Available with Ubuntu Pro inetutils-telnet 2:1.9.4-1ubuntu0.1~esm6 Available with Ubuntu Pro inetutils-telnetd 2:1.9.4-1ubuntu0.1~esm6 Available with Ubuntu Pro inetutils-tools 2:1.9.4-1ubuntu0.1~esm6 Available with Ubuntu Pro inetutils-traceroute 2:1.9.4-1ubuntu0.1~esm6 Available with Ubuntu Pro Ubuntu 14.04 LTS inetutils-ftp 2:1.9.2-1ubuntu0.1~esm4 Available with Ubuntu Pro inetutils-ftpd 2:1.9.2-1ubuntu0.1~esm4 Available with Ubuntu Pro inetutils-inetd 2:1.9.2-1ubuntu0.1~esm4 Available with Ubuntu Pro inetutils-ping 2:1.9.2-1ubuntu0.1~esm4 Available with Ubuntu Pro inetutils-syslogd 2:1.9.2-1ubuntu0.1~esm4 Available with Ubuntu Pro inetutils-talk 2:1.9.2-1ubuntu0.1~esm4 Available with Ubuntu Pro inetutils-talkd 2:1.9.2-1ubuntu0.1~esm4 Available with Ubuntu Pro inetutils-telnet 2:1.9.2-1ubuntu0.1~esm4 Available with Ubuntu Pro inetutils-telnetd 2:1.9.2-1ubuntu0.1~esm4 Available with Ubuntu Pro inetutils-tools 2:1.9.2-1ubuntu0.1~esm4 Available with Ubuntu Pro inetutils-traceroute 2:1.9.2-1ubuntu0.1~esm4 Available with Ubuntu Pro In general, a standard system update will make all the necessary changes.
References
https://ubuntu.com/security/notices/USN-8387-1
CVE-2026-28372, CVE-2026-32746, CVE-2026-32772
Severity
critical
Lowest
Low
Medium
High
Critical
Ubuntu Security Notice USN-8387-1
Topics Covered
Package Information
https://launchpad.net/ubuntu/+source/inetutils/2:2.7-2ubuntu1.1 https://launchpad.net/ubuntu/+source/inetutils/2:2.6-1ubuntu3.2 https://launchpad.net/ubuntu/+source/inetutils/2:2.5-3ubuntu4.2
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