Summary

ath_rate_update L220-248 indexes rt->info[sc_rixmap[rate]] at three sites (series 0/1/2) without checking against rt->rateCount. sc_rixmap initialized 0xff for unmappable rates if_ath.c:6200 memset; rt->info[64] ah.h:681; index 0xff reads ~3056 bytes past end of HAL_RATE_TABLE into adjacent kernel static data. Identical pattern as DF-1931 amrr.c; sample.c:649-656 guards explicitly rix<0||rix>=rt->rateCount but onoe.c omits guard. Three trigger paths: IBSS orphaned node rate not in PHY mode; infrastructure channel/mode switch on live association stale ni_rates; attacker AP advertises alien dot11Rate surviving ieee80211_fix_rate. Impact: OOB read kernel static data rateCode observable in radiotap TX rate 1-byte info channel KASLR bypass; page-fault panic if crosses unmapped page. Fix: rix>=rt->rateCount clamp to 0 mirroring sample.c.

PoC verification

Evidence pack

findings/poc/DF-1948 · 4 files

File	Type	Description	Size
fix.diff	suggested-fix	git-apply-able fix for the cited bug	501 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-1948 VERDICT

Verdict: REPRODUCED (source-confirmed)

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

Mechanism: ath_rate_update L220-248 indexes rt->info[sc_rixmap[rate]] at three sites (series 0/1/2) without checking against rt->rateCount. sc_rixmap initialized 0xff for unmappable rates if_ath.c:6200 memset; r

Citation: sys/dev/netif/ath/ath_rate/onoe/onoe.c:220-248

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: rt->info[0xff] OOB read via sc_rixmap sentinel (onoe.c:220-248)

Verified recommended fix

Source-confirmed: rt->info[0xff] OOB read via sc_rixmap sentinel (onoe.c:220-248)

Verdict