CVE-2026-80640 (GCVE-0-2026-80640)

Vulnerability from cvelistv5 – Published: 2026-08-28 06:48 – Updated: 2026-08-28 06:48
VLAI
Title
cxl/fwctl: Fix __fortify_panic
Summary
In the Linux kernel, the following vulnerability has been resolved: cxl/fwctl: Fix __fortify_panic Fix a runtime assertion in cxlctl_get_supported_features(). Fortify complains that it is potentially overflowing the entries array per __counted_by_le(num_entries). Quiet the false positive by initializing @num_entries earlier. memcpy: detected buffer overflow: 48 byte write of buffer size 0 WARNING: lib/string_helpers.c:1036 at __fortify_report+0x4d/0xa0, CPU#7: fwctl/1398 RIP: 0010:__fortify_report+0x50/0xa0 Call Trace: __fortify_panic+0xd/0xf cxlctl_get_supported_features.cold+0x23/0x35 [cxl_core]
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 4d1c09cef2c244bd19467c016a3e56ba28ecc59d , < b8d15e85596ad8993d42e0703a9741961a2f03eb (git)
Affected: 4d1c09cef2c244bd19467c016a3e56ba28ecc59d , < 18c67ecc5dafe14055edcea53f36f4e31df1816b (git)
Affected: 4d1c09cef2c244bd19467c016a3e56ba28ecc59d , < 6c9d2e87df40d606f1c85143e9acb1ecff463d5e (git)
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Linux Linux Affected: 6.15
Unaffected: 0 , < 6.15 (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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{
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      "descriptions": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncxl/fwctl: Fix __fortify_panic\n\nFix a runtime assertion in cxlctl_get_supported_features(). Fortify\ncomplains that it is potentially overflowing the entries array per\n__counted_by_le(num_entries). Quiet the false positive by initializing\n@num_entries earlier.\n\n memcpy: detected buffer overflow: 48 byte write of buffer size 0\n WARNING: lib/string_helpers.c:1036 at __fortify_report+0x4d/0xa0, CPU#7: fwctl/1398\n RIP: 0010:__fortify_report+0x50/0xa0\n Call Trace:\n  __fortify_panic+0xd/0xf\n  cxlctl_get_supported_features.cold+0x23/0x35 [cxl_core]"
        }
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      "providerMetadata": {
        "dateUpdated": "2026-08-28T06:48:52.650Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/6c9d2e87df40d606f1c85143e9acb1ecff463d5e"
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    "dateReserved": "2026-08-26T14:34:25.778Z",
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    "state": "PUBLISHED"
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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-08-31T15:08:23+00:00",
      "cve": "CVE-2026-80640",
      "id": "CVE-2026-80640",
      "initial_release_date": "2026-08-28T00:00:00+00:00",
      "product_status:known_affected": "76",
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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: cxl/fwctl: Fix __fortify_panic",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80640.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

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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.


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