CVE-2026-23208

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> ALSA: usb-audio: Prevent excessive number of frames<br /> <br /> In this case, the user constructed the parameters with maxpacksize 40<br /> for rate 22050 / pps 1000, and packsize[0] 22 packsize[1] 23. The buffer<br /> size for each data URB is maxpacksize * packets, which in this example<br /> is 40 * 6 = 240; When the user performs a write operation to send audio<br /> data into the ALSA PCM playback stream, the calculated number of frames<br /> is packsize[0] * packets = 264, which exceeds the allocated URB buffer<br /> size, triggering the out-of-bounds (OOB) issue reported by syzbot [1].<br /> <br /> Added a check for the number of single data URB frames when calculating<br /> the number of frames to prevent [1].<br /> <br /> [1]<br /> BUG: KASAN: slab-out-of-bounds in copy_to_urb+0x261/0x460 sound/usb/pcm.c:1487<br /> Write of size 264 at addr ffff88804337e800 by task syz.0.17/5506<br /> Call Trace:<br /> copy_to_urb+0x261/0x460 sound/usb/pcm.c:1487<br /> prepare_playback_urb+0x953/0x13d0 sound/usb/pcm.c:1611<br /> prepare_outbound_urb+0x377/0xc50 sound/usb/endpoint.c:333