---
id: CVE-2026-80623
title: 'coresight: ete: Always save state on power down'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  coresight: ete: Always save state on power down

  System register ETMs and ETE are unlikely to be preserved on CPU power
  down. The ETE DT binding also never documented
  "…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 35e1c9163e025855f23a68f2470c471509e5d779 <
    31633ba13cc49017015f606d5c66eaf5052e99a8
  - >-
    Linux >= 35e1c9163e025855f23a68f2470c471509e5d779 <
    f58d17798882a3aa3323f9d80fe85e25a38f4b93
  - >-
    Linux >= 35e1c9163e025855f23a68f2470c471509e5d779 <
    65d87f28daec31903fc39fee0744f7a0059c19f2
  - >-
    Linux >= 35e1c9163e025855f23a68f2470c471509e5d779 <
    293dacd5b6a9f1275d92ca6c4fd874e54b2c8319
  - >-
    Linux >= 35e1c9163e025855f23a68f2470c471509e5d779 <
    2ab4645fe4206c142a5f1491e191c906279686cf
  - Linux 5.13
published: '2026-08-28'
updated: '2026-10-21'
sourceUpdated: '2026-10-21T12:46:37.127Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-80623'
references:
  - url: 'https://git.kernel.org/stable/c/31633ba13cc49017015f606d5c66eaf5052e99a8'
  - url: 'https://git.kernel.org/stable/c/f58d17798882a3aa3323f9d80fe85e25a38f4b93'
  - url: 'https://git.kernel.org/stable/c/65d87f28daec31903fc39fee0744f7a0059c19f2'
  - url: 'https://git.kernel.org/stable/c/293dacd5b6a9f1275d92ca6c4fd874e54b2c8319'
  - url: 'https://git.kernel.org/stable/c/2ab4645fe4206c142a5f1491e191c906279686cf'
tags:
  - cve.org
epss: 0.00206
epssPercentile: 0.10089
ingestedAt: '2026-10-21T13:57:01.192Z'
---

## Overview

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

coresight: ete: Always save state on power down

System register ETMs and ETE are unlikely to be preserved on CPU power
down. The ETE DT binding also never documented
"arm,coresight-loses-context-with-cpu" so nobody would have legitimately
been able to use that binding to fix it and ACPI has no such binding at
all.

Fix it by hard coding the setting for sysreg ETMs (ETE is always sysreg)
or ACPI boots. Use a local variable when setting up save_state so that
it's immune to concurrent probing when devices have different
configurations which is an issue with modifying the global.

This fixes the following error when using Coresight with ACPI on the FVP
which supports CPU PM:

  coresight ete0: External agent took claim tag
  WARNING: drivers/hwtracing/coresight/coresight-core.c:248 at coresight_disclaim_device_unlocked+0xe0/0xe8, CPU#0: perf/117

## Affected

- `Linux >= 35e1c9163e025855f23a68f2470c471509e5d779 < 31633ba13cc49017015f606d5c66eaf5052e99a8`
- `Linux >= 35e1c9163e025855f23a68f2470c471509e5d779 < f58d17798882a3aa3323f9d80fe85e25a38f4b93`
- `Linux >= 35e1c9163e025855f23a68f2470c471509e5d779 < 65d87f28daec31903fc39fee0744f7a0059c19f2`
- `Linux >= 35e1c9163e025855f23a68f2470c471509e5d779 < 293dacd5b6a9f1275d92ca6c4fd874e54b2c8319`
- `Linux >= 35e1c9163e025855f23a68f2470c471509e5d779 < 2ab4645fe4206c142a5f1491e191c906279686cf`
- `Linux 5.13`

## Remediation

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