---
id: CVE-2026-80704
title: 'drm/amd/display: use proper context for logging'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  drm/amd/display: use proper context for logging

  The same as the rest of the code, get_ss_info_from_atombios() uses
  calc_pll_cs->ctx->logger for logging. But calc_pll_c…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 1296423bf23c7a58133970e223b1f47ec6570308 <
    07b52a41765722ec971e0cd9739b140bf4933998
  - >-
    Linux >= 1296423bf23c7a58133970e223b1f47ec6570308 <
    a94e62b7c7018fcfe0251e53fa96af30f12d923a
  - >-
    Linux >= 1296423bf23c7a58133970e223b1f47ec6570308 <
    02647d98340738f918690ed227fdcf154db1b84a
  - >-
    Linux >= 1296423bf23c7a58133970e223b1f47ec6570308 <
    f556bc844cc4423e5ad41ae41a4c24f1cf75b978
  - >-
    Linux >= 1296423bf23c7a58133970e223b1f47ec6570308 <
    114b42507b6a23d9d24e24e4ef165233332c64d4
  - Linux 4.17
published: '2026-08-28'
updated: '2026-10-21'
sourceUpdated: '2026-10-21T12:46:58.375Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-80704'
references:
  - url: 'https://git.kernel.org/stable/c/07b52a41765722ec971e0cd9739b140bf4933998'
  - url: 'https://git.kernel.org/stable/c/a94e62b7c7018fcfe0251e53fa96af30f12d923a'
  - url: 'https://git.kernel.org/stable/c/02647d98340738f918690ed227fdcf154db1b84a'
  - url: 'https://git.kernel.org/stable/c/f556bc844cc4423e5ad41ae41a4c24f1cf75b978'
  - url: 'https://git.kernel.org/stable/c/114b42507b6a23d9d24e24e4ef165233332c64d4'
tags:
  - cve.org
epss: 0.0016
epssPercentile: 0.04725
ingestedAt: '2026-10-21T12:48:53.750Z'
---

## Overview

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

drm/amd/display: use proper context for logging

The same as the rest of the code, get_ss_info_from_atombios() uses
calc_pll_cs->ctx->logger for logging. But calc_pll_cs->ctx is
initialized only later in calc_pll_max_vco_construct(). Therefore, any
output using DC_LOG_SYNC() leads to a NULL pointer deference in
get_ss_info_from_atombios().

According to Sashiko, the very same problem exists in
dce112_get_pix_clk_dividers() and dcn3_get_pix_clk_dividers() too.

To avoid accessing the NULL context, use clk_src->base.ctx->logger
everywhere. That context in base is initialized earlier in
dce110_clk_src_construct() and dce112_clk_src_construct(). Before
get_ss_info_from_atombios() or Sashiko's get_pix_clk_dividers functions
above are actually called. This is done by redefining DC_LOGGER to
CTX->logger.

Before:
dce110_clk_src_construct() did:
 -> sets clk_src->base.ctx = ctx;
 -> ss_info_from_atombios_create()
   -> get_ss_info_from_atombios()   <- uses calc_pll_cs->ctx  # BOOM
 -> calc_pll_max_vco_construct()    <- sets calc_pll_cs->ctx

After:
dce110_clk_src_construct() does:
 -> sets clk_src->base.ctx = ctx;
 -> ss_info_from_atombios_create()
   -> get_ss_info_from_atombios()   <- uses clk_src->base.ctx

(cherry picked from commit 6f16fcbb0c46a87e3d9685407e906573d60104b0)

## Affected

- `Linux >= 1296423bf23c7a58133970e223b1f47ec6570308 < 07b52a41765722ec971e0cd9739b140bf4933998`
- `Linux >= 1296423bf23c7a58133970e223b1f47ec6570308 < a94e62b7c7018fcfe0251e53fa96af30f12d923a`
- `Linux >= 1296423bf23c7a58133970e223b1f47ec6570308 < 02647d98340738f918690ed227fdcf154db1b84a`
- `Linux >= 1296423bf23c7a58133970e223b1f47ec6570308 < f556bc844cc4423e5ad41ae41a4c24f1cf75b978`
- `Linux >= 1296423bf23c7a58133970e223b1f47ec6570308 < 114b42507b6a23d9d24e24e4ef165233332c64d4`
- `Linux 4.17`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.