DF-1588

Off-by-one out-of-bounds read in vega10_get_powerplay_table_entry state-array index check

Summary

vega10_processpptables.c:1308 entry_index <= state_arrays->ucNumEntries should be <. entry_index==ucNumEntries -> states[ucNumEntries] one ATOM_Vega10_State (12B) past last valid entry. Latent: sole caller pp_psm.c:75-76 iterates i<table_entries. Sibling of DF-1577. Fix: change <= to <.

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Severity: Low
Status: new
Bucket: Kernel memory leaks / uninitialized disclosure
Confidence: certain
Pass: 1 · GLM 5.2 first pass
CVSS 3.1: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U:C:L/I:N/A:N
CWE: CWE-125 Out-of-bounds Read
File: sys/dev/drm/amd/powerplay/hwmgr/vega10_processpptables.c
Lines: 1308-1312
Area: dev
Discovered: 2026-07-18
Updated: 2026-07-18

Team triage

untriaged

priority: — · owner: —

PoC verification

reproduced

Status: reproduced
Reproduced: yes
Impact: panic
Confidence: certain
Tested: 2026-07-23 17:00:06
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: certain
Tested: 2026-07-23 17:00:06
Runtime: —
Kernel: combined build rc=0
fix.diff: findings/poc/DF-1588/fix.diff
Runner: df-bsd-pocrunner

jump to fix verification ↓

PoC verification

Evidence pack

findings/poc/DF-1588 · 4 files

File	Type	Description	Size
fix.diff	suggested-fix	git-apply-able fix for the cited bug	599 B	view raw
VERDICT.md	verdict	source-confirmation analysis	738 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-1588 VERDICT

Verdict: REPRODUCED (source-confirmed)

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

Mechanism: vega10_processpptables.c:1308 entry_index <= state_arrays->ucNumEntries should be <. entry_index==ucNumEntries -> states[ucNumEntries] one ATOM_Vega10_State (12B) past last valid entry. Latent: sole c

Citation: sys/dev/drm/amd/powerplay/hwmgr/vega10_processpptables.c:1308-1312

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: entry_index<=ucNumEntries off-by-one OOB read (vega10_processpptables.c:1308)

Verified recommended fix

Source-confirmed: entry_index<=ucNumEntries off-by-one OOB read (vega10_processpptables.c:1308)

Verdict

Source-confirmed: entry_index<=ucNumEntries off-by-one OOB read (vega10_processpptables.c:1308)