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)).

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	1.0 KB	↓ raw
build.sh	build-script	N/A (source-only)	65 B	view raw
run.sh	run-script	N/A (source-only)	89 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 status (batch validation)

Applied with the 36 sibling fix.diffs of this batch in findings/poc/_batch41/all_fixes.patch; single in-guest make -j6 nativekernel KERNCONF=X86_64_GENERIC completed RC=0 with zero errors under -Werror (full log: findings/poc/_batch41/fix_build8.log). Behavior A/B intentionally skipped for this Info-tier item.

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