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Ubuntu 26.04 Snapd Critical Security Issues July 2026 USN-8579-1

ubuntu
Calendar Grey July 21, 2026
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Three critical fixes in snapd for Ubuntu tackle attacker exploits that may expose sensitive data or elevate privileges.
Several security issues were fixed in snapd.

Summary

Several security issues were fixed in snapd.

Software Description:

- snapd: Daemon and tooling that enable snap packages

Details:

James Henstridge discovered that snapd's default apparmor template did

not restrict access to systemd-userdbd varlink interface. A local

attacker could possibly use this issue to obtain sensitive information.

(CVE-2024-5300)

Qualys discovered that snap-confine can be tricked to create

attacker-controlled files at certain privileged locations. A local

attacker could possibly use this issue to bypass intended restrictions

and escalate privileges to root. This issue only affected

Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 26.04 LTS.

(CVE-2026-8933)

Zygmunt Krynicki discovered that snapd's default seccomp template

did not restrict the creation of executables with the set-user-ID

attribute. A local attacker could possibly use this issue to create

and execute setuid binaries. (CVE-2026-15226)

Topics%20covered

Topics Covered

security advisory critical Ubuntu local attacker SUID snapd

Update Instructions

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

Ubuntu 26.04 LTS
  snapd                           2.76+ubuntu26.04.3

Ubuntu 24.04 LTS
  snapd                           2.76+ubuntu24.04.1

Ubuntu 22.04 LTS
  snapd                           2.76+ubuntu22.04.1

Ubuntu 20.04 LTS
  snapd                           2.67.1+20.04ubuntu1~esm3
                                  Available with Ubuntu Pro

Ubuntu 18.04 LTS
  snapd                           2.61.4ubuntu0.18.04.1+esm4
                                  Available with Ubuntu Pro

Ubuntu 16.04 LTS
  snapd                           2.61.4ubuntu0.16.04.1+esm4
                                  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-8579-1

CVE-2024-5300, CVE-2026-15226, CVE-2026-8933

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8579-1

Topics%20covered

Topics Covered

security advisory critical Ubuntu local attacker SUID snapd

Package Information

https://launchpad.net/ubuntu/+source/snapd/2.76+ubuntu26.04.3
https://launchpad.net/ubuntu/+source/snapd/2.76+ubuntu24.04.1
https://launchpad.net/ubuntu/+source/snapd/2.76+ubuntu22.04.1

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