DF-0332

Statistics counters read without lock: torn 64-bit reads

Summary

GET/CLR_LINK_STATS(:647-698) bcopy stats no lock. Writers under rmtx(recv) and xmtx(xmit) different mutexes. Torn 64-bit counter reads. Correctness only, dedicated stat structs no leak.

Discussion (0)

No comments yet.

Severity: Info
Status: new
Bucket: Base system — network stack
Confidence: certain
Pass: 1 · GLM 5.2 first pass
CVSS 3.1: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U:C:N/I:N/A:N
CWE: CWE-362
File: sys/netgraph7/ppp/ng_ppp.c
Lines: 647-698
Area: net
Discovered: 2026-06-30
Updated: 2026-06-30

Team triage

untriaged

priority: — · owner: —

PoC verification

reproduced

Status: reproduced
Reproduced: yes
Impact: none
Confidence: certain
Tested: 2026-07-23 18:17:10
Attempts: —
Runtime: —
Code hash: —
Guest: DragonFly dfbsd 6.5-DEVELOPMENT #0
Build cmd: —
Run cmd: —

jump to evidence pack ↓

Fix verification

not_testable

Fix status: not_testable
Baseline reproduced: yes
Patched reproduced: no
Confidence: certain
Tested: 2026-07-23 18:17:10
Runtime: —
Kernel: combined build rc=0
fix.diff: findings/poc/DF-0332/fix.diff
Runner: df-bsd-pocrunner

jump to fix verification ↓

PoC verification

Evidence pack

findings/poc/DF-0332 · 1 files

File	Type	Description	Size
manifest.json	file		392 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/netgraph7/ppp/ng_ppp.c:647: statistics counters read without lock (torn 64-bit reads)

Verified recommended fix

Source-confirmed at sys/netgraph7/ppp/ng_ppp.c:647: statistics counters read without lock (torn 64-bit reads)

Verdict

Source-confirmed at sys/netgraph7/ppp/ng_ppp.c:647: statistics counters read without lock (torn 64-bit reads)