Bug 2427116 (CVE-2025-68753)

Summary: CVE-2025-68753 kernel: ALSA: firewire-motu: add bounds check in put_user loop for DSP events
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedKeywords: Security
Target Milestone: ---   
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: ---
Doc Text:
A buffer overwrite vulnerability was found in the Linux kernel's ALSA firewire-motu driver. When handling DSP events, the put_user() loop copies event data to userspace without properly checking if the user buffer size is aligned to 4 bytes. If the buffer is misaligned, the copy operation can write beyond the intended buffer boundary.
 Story Points: ---
Clone Of: Environment:
Last Closed: Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-01-05 10:02:17 UTC 
In the Linux kernel, the following vulnerability has been resolved:

ALSA: firewire-motu: add bounds check in put_user loop for DSP events

In the DSP event handling code, a put_user() loop copies event data.
When the user buffer size is not aligned to 4 bytes, it could overwrite
beyond the buffer boundary.

Fix by adding a bounds check before put_user().
Comment 1 Vipul Nair 2026-01-05 12:03:40 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026010548-CVE-2025-68753-1c6d@gregkh/T