---
id: "CVE-2026-98886"
kind: "vulnerability"
aliases: ["CVE-2026-98886"]
title: "Linux kernel: gma500 HDMI I2C reads can hang and ignore errors"
severity: "unknown"
cvss: null
epss: 0.00215
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["gma500", "infrastructure", "intel-hardware", "linux-kernel", "oaktrail"]
not_affected_if: ["driver-not-loaded", "no-gma500-hardware"]
published_at: "2026-10-23T12:18:22+00:00"
first_seen_at: "2026-10-23T21:57:33+00:00"
updated_at: "2026-10-25T12:38:51+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98886", "first_seen_at": "2026-10-23T21:57:33+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-98886", "first_seen_at": "2026-10-25T12:38:51+00:00"}]
---

# Linux kernel: gma500 HDMI I2C reads can hang and ignore errors

In the Linux gma500 display driver for Oaktrail HDMI, I2C reads ignored timeouts and signal interrupts, so a missing interrupt could leave the read waiting forever. The fix makes the driver return the errors instead, so an attacker mainly gains a possible hang of the display path.

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

## How to check

- unknown

## Fix

- Update to a Linux kernel release that includes the upstream commit 'drm/gma500: return errors from Oaktrail HDMI I2C reads' (the sources do not name a version).

## Timeline

- 2026-10-23T21:57:33+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-98886
- 2026-10-25T12:38:51+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2026-98886

## From the sources

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

drm/gma500: return errors from Oaktrail HDMI I2C reads

xfer_read() waits for the HDMI I2C transaction to reach
I2C_TRANSACTION_DONE, but it ignores both timeout and signal returns from
wait_for_completion_interruptible_timeout().  If the interrupt never
advances the transaction state, the loop can wait forever.

Return -ETIMEDOUT when the completion wait expires, propagate interrupted
waits, and make the I2C master_xfer callback return the first transfer
error instead of reporting a successful message count.

---

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