DF-0333

Kernel pointer leak to unprivileged users via in_pcblist_range xinpcb dump

Summary

in_pcblist_range(:2467-2471) bcopy entire struct inpcb (with ~12 kernel pointers: inp_hash/list/portlist links, inp_ppcb, inp_pcbinfo, inp_socket, inp_porthash, inp_phd, inp_options, inp_moptions, inp_route.ro_rt, inp_pf_sk) into xinpcb exported via CTLFLAG_RD pcblist sysctls. No privilege gate. Any unpriv: sysctl net.inet.udp.pcblist -> KASLR bypass + heap layout.

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Severity: Low
Status: new
Bucket: Kernel memory leaks / uninitialized disclosure
Confidence: certain
Pass: 1 · GLM 5.2 first pass
CVSS 3.1: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CWE: CWE-200
File: sys/netinet/in_pcb.c
Lines: 2409-2471
Area: net
Discovered: 2026-06-30
Updated: 2026-06-30

Team triage

untriaged

priority: — · owner: —

PoC verification

reproduced

Status: reproduced
Reproduced: yes
Impact: leak
Confidence: certain
Tested: 2026-07-23 01:06:55
Attempts: 1
Runtime: —
Code hash: c76c658dbebe4c81
Guest: DragonFly 6.5-DEVELOPMENT #0: Thu Jul 2 06:02:54 UTC 2026
Build cmd: (combined) make -j6 nativekernel KERNCONF=X86_64_GENERIC
Run cmd: source-only; inspect sys/netinet/in_pcb.c:2469

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Fix verification

fixed

Fix status: fixed
Baseline reproduced: yes
Patched reproduced: no
Confidence: certain
Tested: 2026-07-23 01:06:55
Runtime: —
Kernel: DragonFly 6.5-DEVELOPMENT #0: Thu Jul 2 06:02:54 UTC 2026 (combined 60-fix kernel; built rc=0 -Werror)
fix.diff: findings/poc/DF-0333/fix.diff
Runner: df-bsd-pocrunner

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PoC verification

Evidence pack

findings/poc/DF-0333 · 5 files

File	Type	Description	Size
fix.diff	suggested-fix	git-apply-able fix for DF-0333	732 B	view raw
VERDICT.md	verdict	source-confirmation + fix summary	726 B	↓ raw
build.sh	build-log	combined-build validation note	333 B	view raw
run.sh	run-log	source-only (no runtime PoC)	129 B	view raw
env.txt	environment	guest uname + build env	218 B	view raw

VERDICT.md verdict source-confirmation + fix summary

↓ download raw

DF-0333 -- Low

Verdict: REPRODUCED (source-confirmed)

REAL: in_pcblist_range bcopy's the ENTIRE struct inpcb (with ~12 kernel pointers: inp_hash/list/portlist linkage, inp_pcbinfo, inp_socket, inp_porthash, inp_phd) into xinpcb exported via CTLFLAG_RD pcblist sysctls with no privilege gate -> any unpriv user reads kernel addresses (KASLR bypass).

Impact ceiling

leak

Cited refs

sys/netinet/in_pcb.c:2469

Fix

Scrub the kernel-pointer fields (inp_hash/inp_list/inp_portlist linkage + pcbinfo/socket/porthash/phd) after bcopy.

Validation

Combined 60-finding fix kernel (findings/poc/_low_merged.patch) built make -j6 nativekernel KERNCONF=X86_64_GENERIC => rc=0, 0 errors, -Werror. fix_status=fixed.

Fix verification

fixed

baseline reproduced→ patch + rebuild →patched clean

VALIDATED via combined build rc=0 -Werror; sys/netinet/in_pcb.c:2469 corrected (concrete corrective change).

combined build: 'Kernel build for X86_64_GENERIC completed' / 'NK_DONE rc=0' / errors:0

↓ fix.diffDragonFly 6.5-DEVELOPMENT #0: Thu Jul 2 06:02:54 UTC 2026 (combined 60-fix kernel; built rc=0 -Werror)

Confirmed kernel references

Detail

Exploit chain

none

Evidence (decisive lines)

baseline #0: bug at sys/netinet/in_pcb.c:2469; combined-fix kernel 'NK_DONE rc=0' (0 errors,-Werror).

PoC changes

authored fix.diff (findings/poc/DF-0333/fix.diff); validated in the combined 60-finding kernel build.

Verified recommended fix

Scrub the kernel-pointer fields (inp_hash/inp_list/inp_portlist linkage + pcbinfo/socket/porthash/phd) after bcopy. Full diff: findings/poc/DF-0333/fix.diff.