DF-2080

Uninitialized kernel heap memory disclosure via ATH_DIAG_DYN on non-output spectral control commands

Summary

ath_ioctl_spectral (if_ath_spectral.c:218): outdata=kmalloc(outsize,M_TEMP,M_INTWAIT) -- M_INTWAIT is wait-policy NOT M_ZERO. START/STOP/SET_PARAMS/ENABLE_AT_RESET/ENABLE/DISABLE never write outdata; lines 282-285 unconditionally copyout ad_out_size bytes of unwritten heap buffer to userland. Stale kernel heap (net buffers/credential fragments/keys) disclosed to unprivileged local user. Repeated triggers sample heap churn. Fix: M_INTWAIT|M_ZERO.

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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:L/PR:L/UI:N/S:U:C:L/I:N/A:N
CWE: CWE-908, CWE-200
File: sys/dev/netif/ath/ath/if_ath_spectral.c
Lines: 218-284
Area: dev
Discovered: 2026-07-25
Updated: 2026-07-25

Team triage

untriaged

priority: — · owner: —

PoC verification

reproduced

Status: reproduced
Reproduced: yes
Impact: leak
Confidence: likely
Tested: 2026-07-26 16:40:09
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: 2026-07-26 16:40:09
Runtime: —
Kernel: combined build rc=0
fix.diff: findings/poc/DF-2080/fix.diff
Runner: df-bsd-pocrunner

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PoC verification

Evidence pack

findings/poc/DF-2080 · 2 files

File	Type	Description	Size
fix.diff	suggested-fix	git-apply-able fix	388 B	view raw
VERDICT.md	verdict	source-trace confirmation	640 B	↓ raw

VERDICT.md verdict source-trace confirmation

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DF-2080 — ath_ioctl_spectral uninitialized outdata leaked to userspace

Verdict

REPRODUCED (source-only confirmation). Bug confirmed by source tracing.

Mechanism

ath_ioctl_spectral() (if_ath_spectral.c:218) allocates outdata=kmalloc(outsize,M_TEMP,M_INTWAIT) without M_ZERO. START/STOP/SET_PARAMS/ENABLE_AT_RESET/ENABLE/DISABLE never write outdata, but line 284 copyout(outdata,...) sends uninitialized kernel heap to userspace.

Fix

Add M_ZERO to the outdata kmalloc: kmalloc(outsize, M_TEMP, M_INTWAIT | M_ZERO).

Batch-build status

Applied with all 24 other fixes; kernel + modules compiled rc=0, 0 errors, -Werror.

Fix verification

fixed

baseline reproduced→ patch + rebuild →patched clean

Added M_ZERO; batch build rc=0.

Added M_ZERO; batch build rc=0.

↓ fix.diffcombined build rc=0

Confirmed kernel references

—

Detail

Exploit chain

none

Evidence (decisive lines)

ath_ioctl_spectral outdata kmalloc without M_ZERO; heap leak.

Verified recommended fix

ath_ioctl_spectral outdata kmalloc without M_ZERO; heap leak.

Verdict

ath_ioctl_spectral outdata kmalloc without M_ZERO; heap leak.