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.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2026-74278)

Note that Nessus relies on the presence of the package as reported by the vendor.

An update of the linux package has been released.

ID	Name	Product	Family	Type	Severity
349185	SUSE SLES12: cluster-md-kmp-default / dlm-kmp-default / gfs2-kmp-default / etc (SUSE-SU-2026:4282-1)	Nessus	SuSE Local Security Checks	Local	high
343049	Oracle Linux 10 / 9 : Unbreakable Enterprise kernel (ELSA-2026-500248)	Nessus	Oracle Linux Local Security Checks	Local	high
335514	Linux Distros Unpatched Vulnerability : CVE-2026-74278	Nessus	Misc.	Local	medium
334784	Photon OS 5.0: Linux PHSA-2026-5.0-92-0952	Nessus	PhotonOS Local Security Checks	Local	high

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CVE-2026-74278

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