Vulnerability-Lookup

GHSA-88HH-78XV-CJQW

Vulnerability from github – Published: 2026-08-28 09:31 – Updated: 2026-08-28 09:31

Details

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]

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{
  "affected": [],
  "aliases": [
    "CVE-2026-80640"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-28T08:16:48Z",
    "severity": null
  },
  "details": "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]",
  "id": "GHSA-88hh-78xv-cjqw",
  "modified": "2026-08-28T09:31:47Z",
  "published": "2026-08-28T09:31:47Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80640"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/18c67ecc5dafe14055edcea53f36f4e31df1816b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6c9d2e87df40d606f1c85143e9acb1ecff463d5e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b8d15e85596ad8993d42e0703a9741961a2f03eb"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

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

Vulnerability from cvelistv5 – Published: 2026-08-28 06:48 – Updated: 2026-08-28 06:48

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

Linux mitre root

References

3 references

URL	Tags
https://git.kernel.org/stable/c/b8d15e85596ad8993…
https://git.kernel.org/stable/c/18c67ecc5dafe1405…
https://git.kernel.org/stable/c/6c9d2e87df40d606f…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 4d1c09cef2c244bd19467c016a3e56ba28ecc59d , < b8d15e85596ad8993d42e0703a9741961a2f03eb (git) Affected: 4d1c09cef2c244bd19467c016a3e56ba28ecc59d , < 18c67ecc5dafe14055edcea53f36f4e31df1816b (git) Affected: 4d1c09cef2c244bd19467c016a3e56ba28ecc59d , < 6c9d2e87df40d606f1c85143e9acb1ecff463d5e (git)
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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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/cxl/core/features.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "b8d15e85596ad8993d42e0703a9741961a2f03eb",
              "status": "affected",
              "version": "4d1c09cef2c244bd19467c016a3e56ba28ecc59d",
              "versionType": "git"
            },
            {
              "lessThan": "18c67ecc5dafe14055edcea53f36f4e31df1816b",
              "status": "affected",
              "version": "4d1c09cef2c244bd19467c016a3e56ba28ecc59d",
              "versionType": "git"
            },
            {
              "lessThan": "6c9d2e87df40d606f1c85143e9acb1ecff463d5e",
              "status": "affected",
              "version": "4d1c09cef2c244bd19467c016a3e56ba28ecc59d",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/cxl/core/features.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.15"
            },
            {
              "lessThan": "6.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.40",
                  "versionStartIncluding": "6.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.5",
                  "versionStartIncluding": "6.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "6.15",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "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]"
        }
      ],
      "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"
        }
      ],
      "title": "cxl/fwctl: Fix __fortify_panic",
      "x_generator": {
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80640",
    "datePublished": "2026-08-28T06:48:52.650Z",
    "dateReserved": "2026-08-26T14:34:25.778Z",
    "dateUpdated": "2026-08-28T06:48:52.650Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

GHSA-88HH-78XV-CJQW

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

Tags

Sightings

Nomenclature