CVE-2026-74278ALSA: seq: Fix kernel heap address leak in bounce_error_event()

Official description

In the Linux kernel, the following vulnerability has been resolved: ALSA: seq: Fix kernel heap address leak in bounce_error_event() The comment above bounce_error_event() documents that user clients should receive SNDRV_SEQ_EVENT_BOUNCE with the original event embedded as variable-length data, while kernel clients should receive SNDRV_SEQ_EVENT_KERNEL_ERROR with a quoted kernel pointer. However, the implementation unconditionally uses SNDRV_SEQ_EVENT_KERNEL_ERROR with data.quote.event set to the raw struct snd_seq_event pointer for all clients. When a bounce error event is delivered to a USER_CLIENT via snd_seq_read(), the kernel heap address in data.quote.event is exposed to userspace through copy_to_user() in the fixed-length branch. This is a distinct leak path from the one addressed by commit 705dd6dcbc0e ("ALSA: seq: Clear variable event pointer on read"), which sanitizes data.ext.ptr in the variable-length branch of snd_seq_read(). The bounce_error_event() leak uses fixed-length events that take the else branch where no sanitization occurs. Differentiate the bounce event by client type. For USER_CLIENT, send SNDRV_SEQ_EVENT_BOUNCE with SNDRV_SEQ_EVENT_LENGTH_VARIABLE and data.ext pointing to the original event. The variable-length path in snd_seq_event_dup() copies the event data into chained cells, and snd_seq_expand_var_event() copies only the content -- never the pointer -- to userspace. For KERNEL_CLIENT, keep the existing SNDRV_SEQ_EVENT_KERNEL_ERROR behavior with the quoted pointer.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/05e2358fec8812c37516ccea63bc4b9956d864ba
• https://git.kernel.org/stable/c/eae296065ede41a24040e6a7c909ec970f78b4eb
• https://git.kernel.org/stable/c/93d260ce43a81df579c98bee92b91316df9c1c57
• https://git.kernel.org/stable/c/dae23c545eb5a2be3b27a82fd0f611894fb8ab69
• https://git.kernel.org/stable/c/0527a56cb327021cb73167cfddf0e49efa043500
• https://git.kernel.org/stable/c/efc86691e4d8083d9e380ea95042c2cf679f65fd