CVE-2026-80623 (GCVE-0-2026-80623)

Vulnerability from cvelistv5 – Published: 2026-08-28 06:48 – Updated: 2026-08-28 06:48
VLAI
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 "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
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 35e1c9163e025855f23a68f2470c471509e5d779 , < 65d87f28daec31903fc39fee0744f7a0059c19f2 (git)
Affected: 35e1c9163e025855f23a68f2470c471509e5d779 , < 293dacd5b6a9f1275d92ca6c4fd874e54b2c8319 (git)
Affected: 35e1c9163e025855f23a68f2470c471509e5d779 , < 2ab4645fe4206c142a5f1491e191c906279686cf (git)
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Linux Linux Affected: 5.13
Unaffected: 0 , < 5.13 (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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          "product": "Linux",
          "programFiles": [
            "drivers/hwtracing/coresight/coresight-etm4x-core.c"
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              "negate": false,
              "operator": "OR"
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        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncoresight: ete: Always save state on power down\n\nSystem register ETMs and ETE are unlikely to be preserved on CPU power\ndown. The ETE DT binding also never documented\n\"arm,coresight-loses-context-with-cpu\" so nobody would have legitimately\nbeen able to use that binding to fix it and ACPI has no such binding at\nall.\n\nFix it by hard coding the setting for sysreg ETMs (ETE is always sysreg)\nor ACPI boots. Use a local variable when setting up save_state so that\nit\u0027s immune to concurrent probing when devices have different\nconfigurations which is an issue with modifying the global.\n\nThis fixes the following error when using Coresight with ACPI on the FVP\nwhich supports CPU PM:\n\n  coresight ete0: External agent took claim tag\n  WARNING: drivers/hwtracing/coresight/coresight-core.c:248 at coresight_disclaim_device_unlocked+0xe0/0xe8, CPU#0: perf/117"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-28T06:48:42.371Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/65d87f28daec31903fc39fee0744f7a0059c19f2"
        },
        {
          "url": "https://git.kernel.org/stable/c/293dacd5b6a9f1275d92ca6c4fd874e54b2c8319"
        },
        {
          "url": "https://git.kernel.org/stable/c/2ab4645fe4206c142a5f1491e191c906279686cf"
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      ],
      "title": "coresight: ete: Always save state on power down",
      "x_generator": {
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80623",
    "datePublished": "2026-08-28T06:48:42.371Z",
    "dateReserved": "2026-08-26T14:34:25.775Z",
    "dateUpdated": "2026-08-28T06:48:42.371Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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      "date": "2026-09-01",
      "epss": "0.00166",
      "percentile": "0.06092"
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-31T16:11:35+00:00",
      "cve": "CVE-2026-80623",
      "id": "CVE-2026-80623",
      "initial_release_date": "2026-08-28T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: coresight: ete: Always save state on power down",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80623.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.