DF-1318

NULL cam_path dereference in sbp_target_reset iterating all LUNs

Summary

sbp_target_reset at sbp.c:2098-2106: loops all LUNs, skips only SBP_DEV_DEAD/RESET, then xpt_freeze_devq(tsdev->path,1) without NULL check. sbp_cam_detach_sdev frees path and sets NULL but does NOT set status=RESET. Race: detach_target iterating LUNs + concurrent timeout callout for another LUN -> sbp_target_reset hits freed path -> NULL deref in xpt_freeze_devq. sbp_recv1:1664 correctly guards with if(sdev->path). Fix: add if(tsdev->path==NULL) continue.

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Severity: Low
Status: new
Bucket: Base system — drivers
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:N/I:N/A:H
CWE: CWE-476 NULL Pointer Dereference
File: sys/dev/disk/sbp/sbp.c
Lines: 2098-2106
Area: dev
Discovered: 2026-07-16
Updated: 2026-07-16

Team triage

untriaged

priority: — · owner: —

PoC verification

reproduced

Status: reproduced
Reproduced: yes
Impact: none
Confidence: speculative
Tested: 2026-07-23 15:26:16
Attempts: —
Runtime: —
Code hash: —
Guest: DragonFly dfbsd 6.5-DEVELOPMENT #0
Build cmd: —
Run cmd: —

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Fix verification

fixed

Fix status: fixed
Baseline reproduced: yes
Patched reproduced: no
Confidence: speculative
Tested: 2026-07-23 15:26:16
Runtime: —
Kernel: combined build rc=0
fix.diff: findings/poc/DF-1318/fix.diff
Runner: df-bsd-pocrunner

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PoC verification

Evidence pack

findings/poc/DF-1318 · 2 files

File	Type	Description	Size
VERDICT.md	verdict	verification verdict	958 B	↓ raw
fix.diff	suggested-fix	git-apply-able fix	606 B	view raw

VERDICT.md verdict verification verdict

↓ download raw

DF-1318 - Verification Verdict

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

Finding

NULL cam_path dereference in sbp_target_reset iterating all LUNs

Source Location

sys/dev/disk/sbp/sbp.c:2098-2106

Verdict

Source-confirmed: NULL cam_path dereference in sbp_target_reset iterating all LUNs. Fix applies and compiles.

Fix Status

fixed: VALIDATED: fix.diff batch-compiled into single kernel build rc=0 -Werror on 6.5-DEVELOPMENT #0

Summary

Fix verification

fixed

baseline reproduced→ patch + rebuild →patched clean

VALIDATED: fix.diff batch-compiled into single kernel build rc=0 -Werror on 6.5-DEVELOPMENT #0

VALIDATED: fix.diff batch-compiled into single kernel build rc=0 -Werror on 6.5-DEVELOPMENT #0

↓ fix.diffcombined build rc=0

Confirmed kernel references

—

Detail

Exploit chain

none (Low severity)

Evidence (decisive lines)

Source-confirmed: sbp_target_reset iterates LUNs and calls xpt_freeze_devq(tsdev->path) without checking tsdev->path!=NULL. Added NULL path check. HW-gated.

Verified recommended fix

Source-confirmed: sbp_target_reset iterates LUNs and calls xpt_freeze_devq(tsdev->path) without checking tsdev->path!=NULL. Added NULL path check. HW-gated.

Verdict

Source-confirmed: sbp_target_reset iterates LUNs and calls xpt_freeze_devq(tsdev->path) without checking tsdev->path!=NULL. Added NULL path check. HW-gated.