CVE-2026-46088 (GCVE-0-2026-46088)
Vulnerability from cvelistv5
Published
2026-05-27 12:58
Modified
2026-06-14 17:53
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: ALSA: control: Validate buf_len before strnlen() in snd_ctl_elem_init_enum_names() snd_ctl_elem_init_enum_names() advances pointer p through the names buffer while decrementing buf_len. If buf_len reaches zero but items remain, the next iteration calls strnlen(p, 0). While strnlen(p, 0) returns 0 and would hit the existing name_len == 0 error path, CONFIG_FORTIFY_SOURCE's fortified strnlen() first checks maxlen against __builtin_dynamic_object_size(). When Clang loses track of p's object size inside the loop, this triggers a BRK exception panic before the return value is examined. Add a buf_len == 0 guard at the loop entry to prevent calling fortified strnlen() on an exhausted buffer. Found by kernel fuzz testing through Xiaomi Smartphone.
Impacted products
Vendor Product Version
Linux Linux Version: 8d448162bda5ae3b5ecb26fe50c8fbbeae99faa4
Version: 8d448162bda5ae3b5ecb26fe50c8fbbeae99faa4
Version: 8d448162bda5ae3b5ecb26fe50c8fbbeae99faa4
Version: 8d448162bda5ae3b5ecb26fe50c8fbbeae99faa4
Version: 8d448162bda5ae3b5ecb26fe50c8fbbeae99faa4
Version: 8d448162bda5ae3b5ecb26fe50c8fbbeae99faa4
Version: 8d448162bda5ae3b5ecb26fe50c8fbbeae99faa4
Version: 8d448162bda5ae3b5ecb26fe50c8fbbeae99faa4
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{
  "containers": {
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          "programFiles": [
            "sound/core/control.c"
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              "version": "0",
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              "status": "unaffected",
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              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
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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\nALSA: control: Validate buf_len before strnlen() in snd_ctl_elem_init_enum_names()\n\nsnd_ctl_elem_init_enum_names() advances pointer p through the names\nbuffer while decrementing buf_len. If buf_len reaches zero but items\nremain, the next iteration calls strnlen(p, 0).\n\nWhile strnlen(p, 0) returns 0 and would hit the existing name_len == 0\nerror path, CONFIG_FORTIFY_SOURCE\u0027s fortified strnlen() first checks\nmaxlen against __builtin_dynamic_object_size(). When Clang loses track\nof p\u0027s object size inside the loop, this triggers a BRK exception panic\nbefore the return value is examined.\n\nAdd a buf_len == 0 guard at the loop entry to prevent calling fortified\nstrnlen() on an exhausted buffer.\n\nFound by kernel fuzz testing through Xiaomi Smartphone."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-14T17:53:28.015Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/708f6ec9bcdf58bfd561409110baaf4fd3be4ea3"
        },
        {
          "url": "https://git.kernel.org/stable/c/bfcbb4994da9e979c4bcfcf24aaaac69e457e48e"
        },
        {
          "url": "https://git.kernel.org/stable/c/a470f7cabc4df72d9bd132f5719a8717292bb440"
        },
        {
          "url": "https://git.kernel.org/stable/c/1fbe46d2b72754d8bd580e13e59ccb5d3d0e8cb0"
        },
        {
          "url": "https://git.kernel.org/stable/c/8ba0214c3dd32b8ec652947e3f2bc5b8f6e6be9e"
        },
        {
          "url": "https://git.kernel.org/stable/c/654c818a69c21d2bea4e8fd9eae7da865df9a5c8"
        },
        {
          "url": "https://git.kernel.org/stable/c/82012fd3e78a14360fbc2f1a7491589896704f97"
        },
        {
          "url": "https://git.kernel.org/stable/c/e0da8a8cac74f4b9f577979d131f0d2b88a84487"
        }
      ],
      "title": "ALSA: control: Validate buf_len before strnlen() in snd_ctl_elem_init_enum_names()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-46088",
    "datePublished": "2026-05-27T12:58:31.895Z",
    "dateReserved": "2026-05-13T15:03:33.096Z",
    "dateUpdated": "2026-06-14T17:53:28.015Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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