GHSA-p6rv-2qpm-fwvg

`kill -1` is incorrectly parsed as a positional `pid = -1`; combined with the default SIGTERM this calls `kill(-1, SIGTERM)`, signaling nearly every process the caller can see. GNU `kill` recognizes `-1`/`-9` as signals and reports "not enough arguments".

``` $ kill -1 # uutils: kill(-1, SIGTERM) -> mass termination / crash $ kill -1 # GNU: kill: not enough arguments ```

**Impact:** a user running `kill -1` mass-terminates processes, potentially crashing the system. Recommendation: parse `-N` as a signal number, and error with "not enough arguments" when no PID is given.

**Remediation:** Acknowledged by Canonical; fixed in commit cae94028.

--- _Reported by Zellic in the *uutils coreutils Program Security Assessment* (prepared for Canonical, Jan 20 2026), audited commit `3a07ffc5a9bd4c283e75afa548ba1f1957bad242`. Finding 3.70. Credit: Zellic._