ALSA: pcm: Don't setup bogus iov_iter for silencing

{
  "id": "00b493169cdd554da26185613e46facec8dcd9c96a159c1beecffd408a98ff90",
  "url": "https://osv.dev/vulnerability/CVE-2026-64134",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "ALSA: pcm: Don't setup bogus iov_iter for silencing",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: ALSA: pcm: Don't setup bogus iov_iter for silencing At transition to the iov_iter for PCM data transfer, we blindly applied the iov_iter setup also for silencing (i.e. data = NULL), and it leads to a calculation of bogus iov_iter. Fortunately this didn't cause troubles on most of architectures but it goes wrong on RISC-V now, causing a NULL dereference. Handle the NULL data case to treat the silencing in interleaved_copy() for addressing the bug above. noninterleaved_copy() has already the NULL data handling, so it doesn't need changes.",
    "evidence": "osv:CVE-2026-64134",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.6.142",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.92",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.34",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.0.11",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-64134",
      "aliases": [
        "CVE-2026-64134"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
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              "type": "GIT",
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        {
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              "type": "ECOSYSTEM",
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                  "introduced": "6.6.0"
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            {
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          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64134.json"
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      ],
      "modified": "2026-10-28T02:30:38.547268228Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/41a766c647294842c9b17672449f8e011048cba9",
        "https://git.kernel.org/stable/c/c9f6768515818d71bdfc20119a81f3332c53b9c6",
        "https://git.kernel.org/stable/c/ce836587e594af39ff048d9b29dee0f5f10692c9",
        "https://git.kernel.org/stable/c/e4d3386b74fba8e01280484b67ee481ece00201e",
        "https://git.kernel.org/stable/c/feff0251386aa6bb180a0a1cf7c1f91ba868113d",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64134.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-64134",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64134.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-64134",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 506235,
  "published_at": "2026-07-19T15:40:28.974+00:00"
}