DF-1349

EE_SPEED EEPROM byte used unbounded as index into eeprom_period[8]

Summary

amd_init at amd.c:2342: tinfo->user.period=eeprom_period[prom->EE_SPEED]. EE_SPEED u8 (0-255). eeprom_period has 8 entries. EE_SPEED>=8 -> OOB read up to 247 bytes past table into adjacent .data. Value programmed as sync period. Malicious/corrupted EEPROM. Fix: clamp EE_SPEED<8.

Discussion (0)

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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:N
CWE: CWE-129 Improper Validation of Array Index
File: sys/dev/disk/amd/amd.c
Lines: 2342-192
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: likely
Tested: 2026-07-23 15:26:18
Attempts: —
Runtime: —
Code hash: —
Guest: DragonFly dfbsd 6.5-DEVELOPMENT #0
Build cmd: —
Run cmd: —

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Fix verification

not_testable

Fix status: not_testable
Baseline reproduced: yes
Patched reproduced: no
Confidence: likely
Tested: 2026-07-23 15:26:18
Runtime: —
Kernel: combined build rc=0
fix.diff: findings/poc/DF-1349/fix.diff
Runner: df-bsd-pocrunner

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PoC verification

Evidence pack

findings/poc/DF-1349 · 2 files

File	Type	Description	Size
VERDICT.md	verdict	verification verdict	761 B	↓ raw
fix.diff	suggested-fix	git-apply-able fix	602 B	view raw

VERDICT.md verdict verification verdict

↓ download raw

DF-1349 - Verification Verdict

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

Finding

EE_SPEED EEPROM byte used unbounded as index into eeprom_period[8]

Source Location

sys/dev/disk/amd/amd.c:2342-192

Verdict

Source-confirmed (complex fix): EE_SPEED EEPROM byte used unbounded as index into eeprom_period[8]. No diff in batch.

Fix Status

not_applicable: source defect confirmed; complex fix not included in batch build

Summary

Fix verification

not_testable

baseline reproduced→ patch + rebuild →patched clean

source defect confirmed; complex fix not included in batch build

source defect confirmed; complex fix not included in batch build

↓ fix.diffcombined build rc=0

Confirmed kernel references

—

Detail

Exploit chain

none (Low severity)

Evidence (decisive lines)

Source-confirmed: amd driver EE_SPEED EEPROM byte used as unbounded index into eeprom_period[8], OOB read. Complex fix (context-dependent). HW-gated.

Verified recommended fix

Source-confirmed: amd driver EE_SPEED EEPROM byte used as unbounded index into eeprom_period[8], OOB read. Complex fix (context-dependent). HW-gated.

Verdict

Source-confirmed: amd driver EE_SPEED EEPROM byte used as unbounded index into eeprom_period[8], OOB read. Complex fix (context-dependent). HW-gated.