{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-74278",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-74278"
  ],
  "published": "2026-08-15T06:04:33Z",
  "summary": "ALSA: seq: Fix kernel heap address leak in bounce_error_event()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: seq: Fix kernel heap address leak in bounce_error_event()\n\nThe comment above bounce_error_event() documents that user clients\nshould receive SNDRV_SEQ_EVENT_BOUNCE with the original event embedded\nas variable-length data, while kernel clients should receive\nSNDRV_SEQ_EVENT_KERNEL_ERROR with a quoted kernel pointer.\n\nHowever, the implementation unconditionally uses\nSNDRV_SEQ_EVENT_KERNEL_ERROR with data.quote.event set to the raw\nstruct snd_seq_event pointer for all clients.  When a bounce error\nevent is delivered to a USER_CLIENT via snd_seq_read(), the kernel\nheap address in data.quote.event is exposed to userspace through\ncopy_to_user() in the fixed-length branch.\n\nThis is a distinct leak path from the one addressed by commit\n705dd6dcbc0e (\"ALSA: seq: Clear variable event pointer on read\"),\nwhich sanitizes data.ext.ptr in the variable-length branch of\nsnd_seq_read().  The bounce_error_event() leak uses fixed-length\nevents that take the else branch where no sanitization occurs.\n\nDifferentiate the bounce event by client type.  For USER_CLIENT,\nsend SNDRV_SEQ_EVENT_BOUNCE with SNDRV_SEQ_EVENT_LENGTH_VARIABLE\nand data.ext pointing to the original event.  The variable-length\npath in snd_seq_event_dup() copies the event data into chained\ncells, and snd_seq_expand_var_event() copies only the content --\nnever the pointer -- to userspace.  For KERNEL_CLIENT, keep the\nexisting SNDRV_SEQ_EVENT_KERNEL_ERROR behavior with the quoted\npointer.",
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    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-74278"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/93d260ce43a81df579c98bee92b91316df9c1c57"
    },
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      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/dae23c545eb5a2be3b27a82fd0f611894fb8ab69"
    },
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      "url": "https://git.kernel.org/stable/c/0527a56cb327021cb73167cfddf0e49efa043500"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/efc86691e4d8083d9e380ea95042c2cf679f65fd"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-17T05:24:08Z"
  }
}