CVE-2026-92515 (GCVE-0-2026-92515)
Vulnerability from cvelistv5
Published
2026-09-17 16:10
Modified
2026-10-19 09:04
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Preserve unique-field state across nested structs btf_find_struct_field() initializes a fresh seen mask for every recursive descent. Unique special fields in different levels of the same aggregate therefore do not see one another. The duplicate fields can reach btf_parse_fields(), where they trigger an invariant WARN_ON_ONCE(). A crafted user BTF can consequently trigger the warning before map creation checks capabilities. Initialize the seen mask once in btf_find_field() and pass the same pointer through struct, datasec, and nested-struct walks. This gives the entire field traversal one shared uniqueness state.
References
Impacted products
Vendor Product Version
Linux Linux Version: 64e8ee814819f21beeeda00d4119221443d77992
Version: 64e8ee814819f21beeeda00d4119221443d77992
Version: 64e8ee814819f21beeeda00d4119221443d77992
Version: 64e8ee814819f21beeeda00d4119221443d77992
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/bpf/btf.c"
          ],
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          "vendor": "Linux",
          "versions": [
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "6.11"
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              "version": "0",
              "versionType": "semver"
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              "versionType": "semver"
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              "versionType": "semver"
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                  "vulnerable": true
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              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Preserve unique-field state across nested structs\n\nbtf_find_struct_field() initializes a fresh seen mask for every recursive\ndescent. Unique special fields in different levels of the same aggregate\ntherefore do not see one another. The duplicate fields can reach\nbtf_parse_fields(), where they trigger an invariant WARN_ON_ONCE(). A\ncrafted user BTF can consequently trigger the warning before map creation\nchecks capabilities.\n\nInitialize the seen mask once in btf_find_field() and pass the same pointer\nthrough struct, datasec, and nested-struct walks. This gives the entire field\ntraversal one shared uniqueness state."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:04:21.819Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/cec97102d4147e18568c93946014c4c8ebf86fcf"
        },
        {
          "url": "https://git.kernel.org/stable/c/28d5f20ed022ade0fb0bfbf50b78fec782083175"
        },
        {
          "url": "https://git.kernel.org/stable/c/373a1e9366e711b89bc5e45bd6edf33ef62402cd"
        },
        {
          "url": "https://git.kernel.org/stable/c/f08619f060468076e4acbdc10e0713af20d60e65"
        }
      ],
      "title": "bpf: Preserve unique-field state across nested structs",
      "x_generator": {
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      }
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-92515",
    "datePublished": "2026-09-17T16:10:24.159Z",
    "dateReserved": "2026-09-16T12:21:13.873Z",
    "dateUpdated": "2026-10-19T09:04:21.819Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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