Qualys has discovered
a local-privilege escalation (LPE) vulnerability affecting Ubuntu
Desktop 24.04 and later:

This flaw (CVE-2026-3888) allows an unprivileged local attacker to
escalate privileges to full root access through the interaction of two
standard system components: snap-confine and systemd-tmpfiles.

More details are available in the security
advisory. Canonical has published updated packages as well as instructions
for verifying if a system is vulnerable and how to upgrade if so.

https://lwn.net/Articles/1063453/
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