SB20260815191 - Information disclosure in Linux kernel core seq

Description

This security bulletin contains information about 1 vulnerability.

1) Information disclosure (CVE-ID: CVE-2026-74278)

CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor

CVSSv4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a local user to disclose sensitive information.

The vulnerability exists due to improper exposure of sensitive information in bounce_error_event() when delivering bounce error events to a user client via snd_seq_read(). A local user can trigger delivery of a bounce error event and read the returned fixed-length event to disclose sensitive information.

The issue exposes a raw kernel heap pointer from struct snd_seq_event to userspace through copy_to_user() in the fixed-length event handling path.

Remediation

Install update from vendor's website.

References

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