ASoC: soc-core: flush delayed work before removing DAIs and widgets

{
  "id": "982dca5a4a64d6b04594cb3c73404460653e8d8dbbec612293cd186032441518",
  "url": "https://osv.dev/vulnerability/CVE-2026-43459",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "ASoC: soc-core: flush delayed work before removing DAIs and widgets",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: ASoC: soc-core: flush delayed work before removing DAIs and widgets When a sound card is unbound while a PCM stream is open, a use-after-free can occur in snd_soc_dapm_stream_event(), called from the close_delayed_work workqueue handler. During unbind, snd_soc_unbind_card() flushes delayed work and then calls soc_cleanup_card_resources(). Inside cleanup, snd_card_disconnect_sync() releases all PCM file descriptors, and the resulting PCM close path can call snd_soc_dapm_stream_stop() which schedules new delayed work with a pmdown_time timer delay. Since this happens after the flush in snd_soc_unbind_card(), the new work is not caught. soc_remove_link_components() then frees DAPM widgets before this work fires, leading to the use-after-free. The existing flush in soc_free_pcm_runtime() also cannot help as it runs after soc_remove_link_components() has already freed the widgets. Add a flush in soc_cleanup_card_resources() after snd_card_disconnect_sync() (after which no new PCM closes can schedule further delayed work) and before soc_remove_link_dais() and soc_remove_link_components() (which tear down the structures the delayed work accesses).",
    "evidence": "osv:CVE-2026-43459",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
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            "evidence": "/affected/1/ranges"
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            "evidence": "/affected/1/ranges"
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            "evidence": "/affected/1/ranges"
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          {
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            "evidence": "/affected/1/ranges"
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        "affected_versions": []
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    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-43459",
      "aliases": [
        "CVE-2026-43459"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H"
        }
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            "ecosystem": "Linux"
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      ],
      "modified": "2026-10-28T02:30:50.486122992Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/231568afbc0cd25b8fb2a94ebf9738eabe1cf007",
        "https://git.kernel.org/stable/c/317a9298c54bb00319da73e5a7179f00e67fcbdf",
        "https://git.kernel.org/stable/c/3887e514978d28216246360b46a9cb534969eb5a",
        "https://git.kernel.org/stable/c/7d33e6140945482a07f8089ee86e13e02553ffdb",
        "https://git.kernel.org/stable/c/95bc5c225513fc3c4ce169563fb5e3929fbb938b",
        "https://git.kernel.org/stable/c/bf80a89da97285d9b877e0c6995e870d46b8025c",
        "https://git.kernel.org/stable/c/c054f0607c8bb1b1aa529bc109e4149298a1cccd",
        "https://git.kernel.org/stable/c/eab71e11ce2447c1e01809cbc11eab4234cf8dc8",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43459.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-43459",
        "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/2026/43xxx/CVE-2026-43459.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-43459",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 519049,
  "published_at": "2026-05-08T14:22:22.651+00:00"
}