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CVE-2025-40269 is an out-of-bounds write condition in the Linux kernel ALSA USB-audio driver's PCM transfer path. USB-audio PCM data is sent through USB URB packet buffers whose sizes are calculated dynamically. The vulnerable parameter setup derived packet sizes from the audio rate and packets-per-second value without ensuring that the result did not exceed the endpoint's descriptor-constrained maximum packet size, including wMaxPacketSize. A malformed or unusual USB audio descriptor could therefore cause a calculated transfer size larger than the allocated packet buffer. The fix validates the computed packet size against maxpacksize during parameter setup and rejects invalid configurations with -EINVAL.
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No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
23 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A buffer-overflow vulnerability in the Linux kernel ALSA USB audio driver that can lead to information disclosure and denial of service.
A Linux kernel ALSA USB audio driver buffer overflow vulnerability that can lead to information disclosure and denial of service.
A Linux kernel ALSA USB audio driver buffer overflow vulnerability that can cause information disclosure and denial of service.
A Linux kernel ALSA USB audio driver buffer overflow that can lead to information disclosure and denial of service.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.