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Home - Vulnerability NotesPrint
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CERT-In Vulnerability Note CIVN-2026-0156
Local Privilege Escalation Vulnerability in Ubuntu

Original Issue Date:March 23, 2026

Severity Rating: HIGH

Software Affected

  • Ubuntu 16.04 LTS - snapd versions prior to 2.61.4ubuntu0.16.04.1+esm2
  • Ubuntu 18.04 LTS - snapd versions prior to 2.61.4ubuntu0.18.04.1+esm2
  • Ubuntu 20.04 LTS - snapd versions prior to 2.67.1+20.04ubuntu1~esm1
  • Ubuntu 22.04 LTS - snapd versions prior to 2.73+ubuntu22.04.1
  • Ubuntu 24.04 LTS - snapd versions prior to 2.73+ubuntu24.04.2
  • Ubuntu 25.10 LTS - snapd versions prior to 2.73+ubuntu25.10.1

Overview

A vulnerability has been reported in Ubuntu Linux, which could allow a local attacker to escalate privileges to root on the targeted system.

Target Audience:
All end-user organizations and individuals using Ubuntu Linux systems.

Risk Assessment:
High risk of full system compromise.

Impact Assessment:
Potential impact on confidentiality, integrity, and availability of the system.

Description

Snap is a software packaging and deployment system used in Ubuntu to manage applications and their dependencies in a secure and isolated manner.

A local privilege escalation vulnerability exists in Snap due to improper handling of certain operations and insufficient restriction mechanisms. An attacker with local access could exploit this flaw by re-creating snap¿s private /tmp directory when systemd-tmpfiles is enabled to automatically clean up this directory.

Successful exploitation of this vulnerability could allow a local attacker to escalate privileges to root on the targeted system

Solution

Apply appropriate security updates as mentioned in:
https://ubuntu.com/security/CVE-2026-3888

Vendor Information

Ubuntu 
https://ubuntu.com/

References

 
https://ubuntu.com/security/CVE-2026-3888

CVE Name
CVE-2026-3888

Disclaimer

The information provided herein is on "as is" basis, without warranty of any kind.

Contact Information

Email: info@cert-in.org.in
Phone: +91-11-22902657

Postal address

Indian Computer Emergency Response Team (CERT-In)
Ministry of Electronics and Information Technology
Government of India
Electronics Niketan
6, CGO Complex, Lodhi Road,
New Delhi - 110 003
India

 
Indian Computer Emergency Response Team - CERT-In, Ministry of Electronics and Information Technology, Government of India.
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