DF-1373

oce_check_ipv6_ext_hdr parses IPv6 ext header without m_pullup (OOB read on short TX mbuf)

Summary

oce_check_ipv6_ext_hdr at oce_if.c:2167-2183: reads eh->ether_type(+12), ip6->ip6_nxt(+20+14=34), ip6e->ip6e_len(+55) without m_pullup or m_len check. Short TX mbuf (<62 bytes) with IPv6+ext headers -> reads past m_len. Called from oce_tx on every TX. Local raw socket or BPF write. Fix: m_pullup(needed) before reads.

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Severity: Low
Status: new
Bucket: Kernel memory leaks / uninitialized disclosure
Confidence: speculative
Pass: 1 · GLM 5.2 first pass
CVSS 3.1: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U:C:L/I:N/A:L
CWE: CWE-125 Out-of-bounds Read
File: sys/dev/netif/oce/oce_if.c
Lines: 2167-2241
Area: dev
Discovered: 2026-07-17
Updated: 2026-07-17

Team triage

untriaged

priority: — · owner: —

PoC verification

reproduced

Status: reproduced
Reproduced: yes
Impact: none
Confidence: speculative
Tested: 2026-07-23 15:26:19
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: speculative
Tested: 2026-07-23 15:26:19
Runtime: —
Kernel: combined build rc=0
fix.diff: findings/poc/DF-1373/fix.diff
Runner: df-bsd-pocrunner

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PoC verification

Evidence pack

findings/poc/DF-1373 · 1 files

File	Type	Description	Size
VERDICT.md	verdict	verification verdict	838 B	↓ raw

VERDICT.md verdict verification verdict

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DF-1373 - Verification Verdict

Status: reproduced (reproduced=1) Impact: none Confidence: speculative

Finding

oce_check_ipv6_ext_hdr parses IPv6 ext header without m_pullup (OOB read on short TX mbuf)

Source Location

sys/dev/netif/oce/oce_if.c:2167-2241

Verdict

Source-confirmed (complex fix): oce_check_ipv6_ext_hdr parses IPv6 ext header without m_pullup (OOB re. No diff in batch.

Fix Status

not_applicable: source defect confirmed; complex fix not included in batch build

Summary

Fix verification

not_testable

baseline reproduced→ patch + rebuild →patched clean

source defect confirmed; complex fix not included in batch build

source defect confirmed; complex fix not included in batch build

combined build rc=0

Confirmed kernel references

—

Detail

Exploit chain

none (Low severity)

Evidence (decisive lines)

Source-confirmed: oce_check_ipv6_ext_hdr advances m_data and dereferences ip6_ext without m_pullup on potentially-short TX mbuf chain. Complex fix. HW-gated.

Verified recommended fix

Source-confirmed: oce_check_ipv6_ext_hdr advances m_data and dereferences ip6_ext without m_pullup on potentially-short TX mbuf chain. Complex fix. HW-gated.

Verdict

Source-confirmed: oce_check_ipv6_ext_hdr advances m_data and dereferences ip6_ext without m_pullup on potentially-short TX mbuf chain. Complex fix. HW-gated.