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Ubuntu 25.10 Snapd Critical Privilege Escalation USN-8102-1 CVE-2026-3888

ubuntu
Calendar Grey March 17, 2026
Dist Ubuntu Esm H88
Snapd is vulnerable to privilege escalation on multiple Ubuntu versions. Upgrade to avoid security risks.
snapd could be used to escalate privilege

Summary

snapd could be used to escalate privilege

Software Description:

- snapd: Daemon and tooling that enable snap packages

Details:

Qualys discovered that snapd incorrectly handled certain operations in the

snap's private /tmp directory. If systemd-tmpfiles is enabled to automatically

clean up this directory, a local attacker could possibly use this issue to

re-create the deleted directory, resulting in privilege escalation.

Topics%20covered

Topics Covered

security advisory critical privilege escalation Ubuntu snapd cve-2026-3888

Update Instructions

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 25.10
  snapd                           2.73+ubuntu25.10.1

Ubuntu 24.04 LTS
  snapd                           2.73+ubuntu24.04.1

Ubuntu 22.04 LTS
  snapd                           2.73+ubuntu22.04.1

Ubuntu 20.04 LTS
  snapd                           2.67.1+20.04ubuntu1~esm1
                                  Available with Ubuntu Pro

Ubuntu 18.04 LTS
  snapd                           2.61.4ubuntu0.18.04.1+esm2
                                  Available with Ubuntu Pro

Ubuntu 16.04 LTS
  snapd                           2.61.4ubuntu0.16.04.1+esm2
                                  Available with Ubuntu Pro

After a standard system update you need to reboot your computer to make
all the necessary changes.

References

https://ubuntu.com/security/notices/USN-8102-1

CVE-2026-3888

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8102-1

Topics%20covered

Topics Covered

security advisory critical privilege escalation Ubuntu snapd cve-2026-3888

Package Information

https://launchpad.net/ubuntu/+source/snapd/2.73+ubuntu25.10.1
https://launchpad.net/ubuntu/+source/snapd/2.73+ubuntu24.04.1
https://launchpad.net/ubuntu/+source/snapd/2.73+ubuntu22.04.1

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