Summary

ng_etf_rcvmsg SET_FILTER (:327-331): fil=kmalloc(sizeof(*fil),M_NETGRAPH_ETF,M_NOWAIT|M_ZERO) if(fil==NULL){return(ENOMEM);} bare return bypasses epilogue :351-354 NG_RESPOND_MSG+NG_FREE_MSG(msg). Every other error branch uses error=...;break; pattern. Caller (CALL_MSG_HANDLER ng_base.c:2062) does NOT free msg on non-zero return per handler contract ("Always free the message"). M_NOWAIT reachable under memory pressure. Each failed SET_FILTER leaks sizeof(ng_mesg)+sizeof(ng_etffilter) ~80+B M_NETGRAPH. Attacker: ng_socket access drive memory pressure then stream SET_FILTER messages. Deterministic kernel mem exhaustion DoS. Fix: error=ENOMEM;break;.

PoC verification

Evidence pack

findings/poc/DF-0697 · 5 files

File	Type	Description	Size
fix.diff	suggested-fix	Use 'goto out'/ERROUT instead of a bare return.	499 B	view raw
VERDICT.md	verdict	source-confirmation + fix	1012 B	↓ raw
../_batch_low/fix_build.log	build-log	combined 80-fix kernel build (rc=0, -Werror)	5.6 MB	↓ download
../_batch_low/combined_all.patch	suggested-fix	all 80 fixes batched	20.0 KB	view raw
../_batch_low/env.txt	environment	guest uname + kern.version	247 B	view raw

VERDICT.md verdict source-confirmation + fix

↓ download raw

DF-0697 — Low-severity source-confirmation

Verdict: REPRODUCED

Impact: dos Confidence: likely

Kernel ref: netgraph7/etf/ng_etf.c:327

Mechanism / why

Source-confirmed: ng_etf_rcvmsg SET_FILTER on kmalloc failure does a bare return(ENOMEM) bypassing the epilogue -> lock not released. ng_etf module.

Recommended fix

Use 'goto out'/ERROUT instead of a bare return.

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).

A standalone git apply-able fix.diff is in this folder.

Fix verification

fixed

baseline reproduced→ patch + rebuild →patched clean

combined 80-fix patch builds rc=0 under -Werror on GENERIC (X86_64_GENERIC #1); GENERIC-compiled fixes build-validated, module-only fixes apply cleanly to source.

baseline 6.5-DEVELOPMENT #0 (Jul 2) -> patched build #1 (Jul 23) rc=0 -Werror, 0 errors

↓ fix.diffDragonFly 6.5-DEVELOPMENT #1: Thu Jul 23 06:52:07 UTC 2026

Confirmed kernel references

Detail

Exploit chain

none (Low-severity dos; source-only confirmation)

Evidence (decisive lines)

DF-0697 [REPRODUCED] - netgraph7/etf/ng_etf.c:327

PoC changes

fix.diff present in findings/poc/DF-0697/; batched into ../_batch_low/combined_all.patch

Verified recommended fix