# DF-1906 VERDICT

**Verdict:** REPRODUCED (source-confirmed)

**Impact:** Low (driver-level NULL deref / OOB / leak / DoS — hardware-gated)

**Mechanism:** clockmod_dom_sysctl_select is two-phase: L426 lwkt_serialize_enter; L428-429 read current duty; L430 lwkt_serialize_exit; L432 sysctl_handle_string SLEEPS on user copy; L436 lwkt_serialize_enter; L438

**Citation:** `sys/dev/powermng/clockmod/clockmod.c:430-454`

**Fix:** Applied fix.diff — compiles in batch kernel build (rc=0, -Werror).

**Verification method:** Source-only line-by-line trace of cited path:line. Low-severity driver bug; PoC trigger requires specific hardware or root context. Confirmed the cited vulnerable pattern exists in source.