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EUVD-2026-292631

fkie_cve-2026-35349

A vulnerability in the rm utility of uutils coreutils allows a bypass of the --preserve-root protection. The implementation uses a path-string check rather than comparing device and inode numbers to identify the root directory. An attacker or accidental user can bypass this safeguard by using a symbolic link that resolves to the root directory (e.g., /tmp/rootlink -> /), potentially leading to the unintended recursive deletion of the entire root filesystem.

GHSA-7cr3-h577-g38j — rm: --preserve-root bypassed via a symlink to / (string check instead of dev/inode)

Affected: crates.io: uu_rm

The `--preserve-root` check uses a path-string test (`path.has_root() && path.parent().is_none()`) rather than comparing device/inode. A symlink to `/` (e.g. `/tmp/rootlink -> /`) has a parent component, so it passes the check. GNU caches `/`'s dev/inode at startup and compares every traversed directory against it.

**Impact:** `rm -rf --preserve-root` on a path that resolves through a symlink to `/` bypasses protection and can delete system directories. Recommendation: compare each entered directory's dev/inode against cached `/`.

**Remediation:** Acknowledged by Canonical; fixed in commit 5e5968cd.

--- _Reported by Zellic in the *uutils coreutils Program Security Assessment* (prepared for Canonical, Jan 20 2026), audited commit `3a07ffc5a9bd4c283e75afa548ba1f1957bad242`. Finding 3.44. Credit: Zellic._

UBUNTU-CVE-2026-35349

Affected: Ubuntu:24.04:LTS: rust-coreutils, Ubuntu:25.10: rust-coreutils