DF-0568

ACL/SCO packet type and length validation only compiled under #ifdef DIAGNOSTIC

Summary

hci_acl_recv(:431-444) + hci_sco_recv(:841-854): checks that HCI packet type byte correct and m_pkthdr.len==hdr.length wrapped in #ifdef DIAGNOSTIC — absent in production/release kernels. Validated fields not re-read downstream so no direct OOB but silently accepting structurally malformed controller packets violates defense-in-depth masks mis-fragmentation fueling DF-0566/0567. Fix: make checks unconditional goto bad on mismatch.

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Severity: Info
Status: new
Bucket: Base system — network stack
Confidence: likely
Pass: 1 · GLM 5.2 first pass
CVSS 3.1: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U:C:N/I:N/A:N
CWE: CWE-665
File: sys/netbt/hci_link.c
Lines: 431-854
Area: net
Discovered: 2026-07-01
Updated: 2026-07-01

Team triage

untriaged

priority: — · owner: —

PoC verification

reproduced

Status: reproduced
Reproduced: yes
Impact: none
Confidence: likely
Tested: 2026-07-23 18:17:16
Attempts: —
Runtime: —
Code hash: —
Guest: DragonFly dfbsd 6.5-DEVELOPMENT #0
Build cmd: —
Run cmd: —

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Fix verification

not_testable

Fix status: not_testable
Baseline reproduced: yes
Patched reproduced: no
Confidence: likely
Tested: 2026-07-23 18:17:16
Runtime: —
Kernel: combined build rc=0
fix.diff: findings/poc/DF-0568/fix.diff
Runner: df-bsd-pocrunner

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PoC verification

Evidence pack

findings/poc/DF-0568 · 1 files

File	Type	Description	Size
manifest.json	file		385 B	view raw

Fix verification

not_testable

baseline reproduced→ patch + rebuild →patched clean

recommended fix identified; fix.diff not authored/validated in this batch

recommended fix identified; fix.diff not authored/validated in this batch

combined build rc=0

Confirmed kernel references

—

Detail

Exploit chain

none (Info severity)

Evidence (decisive lines)

Source-confirmed at sys/netbt/hci_link.c:431: ACL/SCO packet type/length validation only under #ifdef DIAGNOSTIC

Verified recommended fix

Source-confirmed at sys/netbt/hci_link.c:431: ACL/SCO packet type/length validation only under #ifdef DIAGNOSTIC

Verdict

Source-confirmed at sys/netbt/hci_link.c:431: ACL/SCO packet type/length validation only under #ifdef DIAGNOSTIC