Three bypass methods were found in Ubuntu Linux's user namespace security, impacting versions 23.10 and 24.04. These flaws allow unprivileged users to gain admin-level control within namespaces, potentially exploiting kernel vulnerabilities. Discovered by Qualys, the bypasses leverage weaknesses in AppArmor via aa-exec, busybox, and LD_PRELOAD. Canonical plans standard updates, not emergency patches, and recommends hardening steps for administrators.

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