DF-1643

Missing caps_priv_check on destructive ATA ioctls (IOCATADETACH/ATTACH/REINIT/REQUEST)

Summary

ata-all.c:369 ata_ioctl handles IOCATAATTACH/DETACH/REINIT (392/400/384) NO caps_priv_check. 450 ata_device_ioctl handles IOCATAREQUEST (461) raw ATA/ATAPI passthrough NO priv check. Sibling atapi-cd.c:360 DOES gate CDIOCRESET with caps_priv_check(SYSCAP_RESTRICTEDROOT). /dev/ata mode 0600 root:operator -> operator group can IOCATADETACH (panic/corruption) or IOCATAREQUEST raw ATA_WRITE_DMA to any sector bypassing GEOM/FS perms. Fix: caps_priv_check SYSCAP_RESTRICTEDROOT on destructive + passthrough ioctls.

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Severity: Low
Status: new
Bucket: Privilege escalation (general use)
Confidence: likely
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:L/A:H
CWE: CWE-862 Missing Authorization
File: sys/dev/disk/nata/ata-all.c
Lines: 369-461
Area: dev
Discovered: 2026-07-18
Updated: 2026-07-18

Team triage

untriaged

priority: — · owner: —

PoC verification

reproduced

Status: reproduced
Reproduced: yes
Impact: none
Confidence: likely
Tested: 2026-07-23 17:00:09
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: 2026-07-23 17:00:09
Runtime: —
Kernel: combined build rc=0
fix.diff: findings/poc/DF-1643/fix.diff
Runner: df-bsd-pocrunner

jump to fix verification ↓

PoC verification

Evidence pack

findings/poc/DF-1643 · 4 files

File	Type	Description	Size
fix.diff	suggested-fix	git-apply-able fix for the cited bug	720 B	view raw
VERDICT.md	verdict	source-confirmation analysis	707 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-1643 VERDICT

Verdict: REPRODUCED (source-confirmed)

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

Mechanism: ata-all.c:369 ata_ioctl handles IOCATAATTACH/DETACH/REINIT (392/400/384) NO caps_priv_check. 450 ata_device_ioctl handles IOCATAREQUEST (461) raw ATA/ATAPI passthrough NO priv check. Sibling atapi-cd.

Citation: sys/dev/disk/nata/ata-all.c:369-461

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: missing caps_priv_check on destructive IOCATAATTACH/DETACH/REINIT (ata-all.c:369-461)

Verified recommended fix

Source-confirmed: missing caps_priv_check on destructive IOCATAATTACH/DETACH/REINIT (ata-all.c:369-461)

Verdict

Source-confirmed: missing caps_priv_check on destructive IOCATAATTACH/DETACH/REINIT (ata-all.c:369-461)