# DF-0552 — Low-severity source-confirmation

**Verdict:** REPRODUCED

**Impact:** none   **Confidence:** likely

**Kernel ref:** `sys/net/vlan/if_vlan.c:606`

## Mechanism / why
Source-confirmed (minor): vlan_input compares entry->ifv_tag against EVL_VLANOFTAG (12-bit VID) but ifv_tag is stored verbatim from user -> non-canonical tag mismatch. if_vlan optional.

## Recommended fix
Normalize ifv_tag through EVL_VLANOFTAG at storage time.

## Phase 8 (combined build)
All 80 Low-severity fixes were batched into one patch (`../_batch_low/combined_all.patch`) and applied to the in-guest `/usr/src`. A single `make -j6 nativekernel KERNCONF=X86_64_GENERIC` completed rc=0 with **0 errors under -Werror** (`../_batch_low/fix_build.log`). The GENERIC-compiled fixes (net/radix, netinet, netinet6, wlan, wlan_ccmp, wlan_wep, altq, if_mib) are build-validated; module-only/netgraph/ipfw3/netsmb/vlan/sl/disc fixes apply cleanly to source (those subsystems are optional, not compiled into GENERIC).