Detections
Analytics
CVE-2025-40269
medium
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].
References
https://git.kernel.org/stable/c/ef592bf2232a2daa9fffa8881881fc9957ea56e9
https://git.kernel.org/stable/c/ece3b981bb6620e47fac826a2156c090b1a936a0
https://git.kernel.org/stable/c/e0ed5a36fb3ab9e7b9ee45cd17f09f6d5f594360
https://git.kernel.org/stable/c/d67dde02049e632ba58d3c44a164a74b6a737154
https://git.kernel.org/stable/c/d2c04f20ccc6c0d219e6d3038bab45bc66a178ad
https://git.kernel.org/stable/c/c4dc012b027c9eb101583011089dea14d744e314
https://git.kernel.org/stable/c/ab0b5e92fc36ee82c1bd01fe896d0f775ed5de41
https://git.kernel.org/stable/c/98e9d5e33bda8db875cc1a4fe99c192658e45ab6
https://git.kernel.org/stable/c/6a5da3fa80affc948923f20a4e086177f505e86e
https://git.kernel.org/stable/c/480a1490c595a242f27493a4544b3efb21b29f6a
https://git.kernel.org/stable/c/282aba56713bbc58155716b55ca7222b2d9cf3c8
https://git.kernel.org/stable/c/217d47255a2ec8b246f2725f5db9ac3f1d4109d7
https://git.kernel.org/stable/c/05a1fc5efdd8560f34a3af39c9cf1e1526cc3ddf