ALSA: core: Fix NULL module pointer assignment at card init

{
  "id": "8a9bf222a6ae49ff79654fe6174b5217b2dc26c6de19f30f1db6f5d43bab1858",
  "url": "https://osv.dev/vulnerability/CVE-2024-38605",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "ALSA: core: Fix NULL module pointer assignment at card init",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: ALSA: core: Fix NULL module pointer assignment at card init The commit 81033c6b584b (\"ALSA: core: Warn on empty module\") introduced a WARN_ON() for a NULL module pointer passed at snd_card object creation, and it also wraps the code around it with '#ifdef MODULE'. This works in most cases, but the devils are always in details. \"MODULE\" is defined when the target code (i.e. the sound core) is built as a module; but this doesn't mean that the caller is also built-in or not. Namely, when only the sound core is built-in (CONFIG_SND=y) while the driver is a module (CONFIG_SND_USB_AUDIO=m), the passed module pointer is ignored even if it's non-NULL, and card->module remains as NULL. This would result in the missing module reference up/down at the device open/close, leading to a race with the code execution after the module removal. For addressing the bug, move the assignment of card->module again out of ifdef. The WARN_ON() is still wrapped with ifdef because the module can be really NULL when all sound drivers are built-in. Note that we keep 'ifdef MODULE' for WARN_ON(), otherwise it would lead to a false-positive NULL module check. Admittedly it won't catch perfectly, i.e. no check is performed when CONFIG_SND=y. But, it's no real problem as it's only for debugging, and the condition is pretty rare.",
    "evidence": "osv:CVE-2024-38605",
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    "severity": "high",
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      "aliases": [
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      "modified": "2026-10-28T02:30:36.831187226Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/39381fe7394e5eafac76e7e9367e7351138a29c1",
        "https://git.kernel.org/stable/c/6b8374ee2cabcf034faa34e69a855dc496a9ec12",
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        "https://git.kernel.org/stable/c/d7ff29a429b56f04783152ad7bbd7233b740e434",
        "https://git.kernel.org/stable/c/e007476725730c1a68387b54b7629486d8a8301e",
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        "https://git.kernel.org/stable/c/e7e0ca200772bdb2fdc6d43d32d341e87a36f811",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/38xxx/CVE-2024-38605.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2024-38605",
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    "severity_evidence": "/severity/0/score"
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  "source_id": "core-osv",
  "document_id": 504042,
  "published_at": "2024-06-19T13:48:15.769+00:00"
}