CVE-2025-40269

Description

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].

PUBLISHED Reserved 2025-04-16 | Published 2025-12-06 | Updated 2025-12-06 | Assigner Linux

Product status

References

git.kernel.org/...c/6a5da3fa80affc948923f20a4e086177f505e86e

git.kernel.org/...c/217d47255a2ec8b246f2725f5db9ac3f1d4109d7

git.kernel.org/...c/ef592bf2232a2daa9fffa8881881fc9957ea56e9

git.kernel.org/...c/ece3b981bb6620e47fac826a2156c090b1a936a0

git.kernel.org/...c/98e9d5e33bda8db875cc1a4fe99c192658e45ab6

git.kernel.org/...c/d2c04f20ccc6c0d219e6d3038bab45bc66a178ad

git.kernel.org/...c/05a1fc5efdd8560f34a3af39c9cf1e1526cc3ddf

cve.org (CVE-2025-40269)

nvd.nist.gov (CVE-2025-40269)

Download JSON