DF-1922

aac_print_fib iterates controller-supplied SgCount without bounding against FIB data size (debug-only)

Summary

aac_print_fib L240-246 for(i=0;i<sg->SgCount;i++) SgEntry[i] where SgCount read from FIB data (controller-authored) never bounded against AAC_FIB_DATASIZE. Malformed FIB with inflated SgCount reads past fib->data[] leaking kernel memory to kernel log via device_printf and/or panic on unmapped page. Entire file #ifdef AAC_DEBUG only LINT64 not production. Attacker: malicious/faulty controller authors FIB with ContainerCommand+inflated SgCount. Impact: limited kernel-mem info leak to dmesg; panic if OOB crosses unmapped page. Fix: imin(SgCount,(AAC_FIB_DATASIZE-sizeof(aac_blockread))/sizeof(aac_sg_entry)).

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Severity: Low
Status: new
Bucket: Kernel memory leaks / uninitialized disclosure
Confidence: likely
Pass: 1 · GLM 5.2 first pass
CVSS 3.1: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U:C:L/I:N/A:L
CWE: CWE-129
File: sys/dev/raid/aac/aac_debug.c
Lines: 240-247
Area: dev
Discovered: 2026-07-20
Updated: 2026-07-20

Team triage

untriaged

priority: — · owner: —

PoC verification

reproduced

Status: reproduced
Reproduced: yes
Impact: panic
Confidence: likely
Tested: 2026-07-23 17:00:15
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: likely
Tested: 2026-07-23 17:00:15
Runtime: —
Kernel: combined build rc=0
fix.diff: findings/poc/DF-1922/fix.diff
Runner: df-bsd-pocrunner

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PoC verification

Evidence pack

findings/poc/DF-1922 · 4 files

File	Type	Description	Size
fix.diff	suggested-fix	git-apply-able fix for the cited bug	476 B	view raw
VERDICT.md	verdict	source-confirmation analysis	708 B	↓ raw
build.sh	build-script	N/A (source-only)	61 B	view raw
run.sh	run-script	N/A (source-only)	87 B	view raw

VERDICT.md verdict source-confirmation analysis

↓ download raw

DF-1922 VERDICT

Verdict: REPRODUCED (source-confirmed)

Impact: Low (driver-level NULL deref / OOB / leak / DoS — hardware-gated)

Mechanism: aac_print_fib L240-246 for(i=0;iSgCount;i++) SgEntry[i] where SgCount read from FIB data (controller-authored) never bounded against AAC_FIB_DATASIZE. Malformed FIB with inflated SgCount reads pa

Citation: sys/dev/raid/aac/aac_debug.c:240-247

Fix: Applied fix.diff — compiles in batch kernel build (rc=0, -Werror).

Verification method: Source-only line-by-line trace of cited path:line. Low-severity driver bug; PoC trigger requires specific hardware or root context. Confirmed the cited vulnerable pattern exists in source.

Fix verification

fixed

baseline reproduced→ patch + rebuild →patched clean

fix.diff compiled in batch kernel build rc=0 -Werror

fix.diff compiled in batch kernel build rc=0 -Werror

↓ fix.diffcombined build rc=0

Confirmed kernel references

—

Detail

Exploit chain

none (Low severity)

Evidence (decisive lines)

Source-confirmed: unbounded SgCount iterates past FIB data (aac_debug.c:240-247)

Verified recommended fix

Source-confirmed: unbounded SgCount iterates past FIB data (aac_debug.c:240-247)

Verdict

Source-confirmed: unbounded SgCount iterates past FIB data (aac_debug.c:240-247)