CVE-2025-68753
Description
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().
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
A bounds check was added to the DSP event put_user loop in the ALSA firewire-motu driver to prevent buffer overrun due to unaligned buffer size.
Vulnerability
The ALSA firewire-motu driver's DSP event handling code contained a missing bounds check in a put_user() loop. When the user-provided buffer size was not aligned to 4 bytes, the loop could write beyond the allocated buffer, leading to a buffer overrun [1].
Exploitation
A local user with access to a supported firewire-motu device can trigger this vulnerability by submitting an event buffer with an unaligned size. The driver then copies excessive data, causing memory corruption.
Impact
Successful exploitation could corrupt kernel memory, potentially allowing an attacker to escalate privileges or cause a denial of service.
Mitigation
The issue is fixed in the Linux kernel by adding a bounds check before each put_user() call. Users should apply stable kernel updates containing commits [1] and [2].
AI Insight generated on May 19, 2026. Synthesized from this CVE's description and the cited reference URLs; citations are validated against the source bundle.
Affected products
1Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
6- git.kernel.org/stable/c/0d71b3c2ed742f1ccb3b0b7a61afb90c0251093fnvd
- git.kernel.org/stable/c/298e753880b6ea99ac30df34959a7a03b0878eednvd
- git.kernel.org/stable/c/6d4f17782ce4facf3197e79707df411ee3d7b30anvd
- git.kernel.org/stable/c/8f9e51cf2a2a43d0cd72d3dc0b5ccea3f639c187nvd
- git.kernel.org/stable/c/df692cf2b601a54b34edfdb9e683d67483aa8ce1nvd
- git.kernel.org/stable/c/ea2c921d9de6e32ca50cb817b9d57bb881be70denvd
News mentions
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