# DF-1928 VERDICT

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

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

**Mechanism:** acpi_battery_clean_str L321-334: for(i=0;i<len&&*str!=0;i++,str++) increments str to str+len when no NUL in len bytes. Post-loop if(i==len)*str=0 writes NUL at str+len one byte past callers buffer. Fo

**Citation:** `sys/dev/acpica/acpi_battery.c:326-333`

**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.