---
id: "CVE-2026-99034"
kind: "vulnerability"
aliases: ["CVE-2026-99034"]
title: "Linux kernel: SD host driver leaves runtime PM enabled on removal"
severity: "unknown"
cvss: null
epss: 0.00209
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["embedded", "infrastructure", "linux-kernel", "unisoc-hardware"]
not_affected_if: ["no-driver-unbind", "no-unisoc-hardware"]
published_at: "2026-10-23T13:17:26+00:00"
first_seen_at: "2026-10-23T21:57:33+00:00"
updated_at: "2026-10-25T12:38:50+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-99034", "first_seen_at": "2026-10-23T21:57:33+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-99034", "first_seen_at": "2026-10-25T12:38:50+00:00"}]
---

# Linux kernel: SD host driver leaves runtime PM enabled on removal

The sdhci-sprd MMC driver in the Linux kernel does not undo its runtime power management setup when removed, so clocks can be disabled twice if the device is suspended. The sources describe a kernel fault found by code inspection, with no stated way for an attacker to trigger it.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- unknown

## Fix

- unknown

## Timeline

- 2026-10-23T21:57:33+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-99034
- 2026-10-25T12:38:50+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2026-99034

## From the sources

In the Linux kernel, the following vulnerability has been resolved:

mmc: sdhci-sprd: disable runtime PM on remove

sdhci_sprd_probe() enables runtime PM, while sdhci_sprd_remove() does
not perform the corresponding runtime PM cleanup.

The probe failure path disables runtime PM before disabling the clocks,
but the normal remove path directly disables clocks that are also
managed by the runtime PM callbacks. If the device is runtime
suspended, those clocks may already be disabled.

Resume the device before removal, disable runtime PM and drop the
temporary runtime PM reference before disabling the clocks.

This issue was found by manual code inspection.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_