# DF-1570 VERDICT

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

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

**Mechanism:** xdisk.c:767 xa_close acquires xdisk_lk. 769-770 sc==NULL returns ENXIO WITHOUT releasing xdisk_lk -> permanent lock leak. 771-773 sc->terminating does lockmgr(&sc->lk, LK_RELEASE) releasing WRONG lock

**Citation:** `sys/dev/disk/xdisk/xdisk.c:767-793`

**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.