HighFix available
ALSA: usb-audio: Fix potential overflow of PCM transfer buffer
Type: advisorySources: OSV
In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: Fix potential overflow of PCM transfer buffer The PCM stream data in USB-audio driver is transferred over USB URB packet buffers, and each packet size is determined dynamically. The packet sizes are limited by some factors such as wMaxPacketSize USB descriptor. OTOH, in the current code, the actually used packet sizes are determined only by the rate and the PPS, which may be bigger than the size limit above. This results in a buffer overflow, as reported by syzbot. Basically when the limit is smaller than the calculated packet size, it implies that something is wrong, most likely a weird USB descriptor. So the best option would be just to return an error at the parameter setup time before doing any further operations. This patch introduces such a sanity check, and returns -EINVAL when the packet size is greater than maxpacksize. The comparison with ep->packsize[1] alone should suffice since it's always equal or greater than ep->packsize[0].
- Products
- Kernel
- Affected versions
- Not specified
- Fixed versions
- 4.14.188, 4.19.132, 4.4.230, 4.9.230, 5.10.247, 5.15.197, 5.4.51, 5.7.8, 6.1.159, 6.12.59, 6.17.9, 6.6.117
- CVEs
- CVE-2025-40269
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 4 Nov 2026, 08:42 UTC · Revision 1
Source evidence
ALSA: usb-audio: Fix potential overflow of PCM transfer buffer
core-osv · Original sourcePublished 6 Dec 2025, 21:50 UTC
In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: Fix potential overflow of PCM transfer buffer The PCM stream data in USB-audio driver is transferred over USB URB packet buffers, and each packet size is determined dynamically. The packet sizes are limited by some factors such as wMaxPacketSize USB descriptor. OTOH, in the current code, the actually used packet sizes are determined only by the rate and the PPS, which may be bigger than the size limit above. This results in a buffer overflow, as reported by syzbot. Basically when the limit is smaller than the calculated packet size, it implies that something is wrong, most likely a weird USB descriptor. So the best option would be just to return an error at the parameter setup time before doing any further operations. This patch introduces such a sanity check, and returns -EINVAL when the packet size is greater than maxpacksize. The comparison with ep->packsize[1] alone should suffice since it's always equal or greater than ep->packsize[0].
osv:CVE-2025-40269
Kernel
Fixed versions: 4.4.230, 4.9.230, 4.14.188, 4.19.132, 5.4.51, 5.7.8, 5.10.247, 5.15.197, 6.1.159, 6.6.117, 6.12.59, 6.17.9
Complete source record
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