CVE-2026-23208

Summary

In the Linux kernel, the following vulnerability has been resolved:

ALSA: usb-audio: Prevent excessive number of frames

In this case, the user constructed the parameters with maxpacksize 40 for rate 22050 / pps 1000, and packsize[0] 22 packsize[1] 23. The buffer size for each data URB is maxpacksize * packets, which in this example is 40 * 6 = 240; When the user performs a write operation to send audio data into the ALSA PCM playback stream, the calculated number of frames is packsize[0] * packets = 264, which exceeds the allocated URB buffer size, triggering the out-of-bounds (OOB) issue reported by syzbot [1].

Added a check for the number of single data URB frames when calculating the number of frames to prevent [1].

[1] BUG: KASAN: slab-out-of-bounds in copy_to_urb+0x261/0x460 sound/usb/pcm.c:1487 Write of size 264 at addr ffff88804337e800 by task syz.0.17/5506 Call Trace: copy_to_urb+0x261/0x460 sound/usb/pcm.c:1487 prepare_playback_urb+0x953/0x13d0 sound/usb/pcm.c:1611 prepare_outbound_urb+0x377/0xc50 sound/usb/endpoint.c:333

Affected Software

VendorProductVersion RangeStatus
LinuxLinux02c56650f3c118d3752122996d96173d26bb13aa < 480a1490c595a242f27493a4544b3efb21b29f6aaffected
LinuxLinux5ef30e443e6d3654cccecec99cf481a69a0a6d3b < ab0b5e92fc36ee82c1bd01fe896d0f775ed5de41affected
LinuxLinux99703c921864a318e3e8aae74fde071b1ff35bea < 282aba56713bbc58155716b55ca7222b2d9cf3c8affected
LinuxLinux2d50acd7dbd0682a56968ad9551341d7fc5b6eaf < c4dc012b027c9eb101583011089dea14d744e314affected
LinuxLinuxaba41867dd66939d336fdf604e4d73b805d8039f < e0ed5a36fb3ab9e7b9ee45cd17f09f6d5f594360affected
LinuxLinuxd288dc74f8cf95cb7ae0aaf245b7128627a49bf3 < d67dde02049e632ba58d3c44a164a74b6a737154affected
LinuxLinuxf0bd62b64016508938df9babe47f65c2c727d25c < 62932d9ed639a9fa71b4ac1a56766a4b43abb7e4affected
LinuxLinuxf0bd62b64016508938df9babe47f65c2c727d25c < ef5749ef8b307bf8717945701b1b79d036af0a15affected
LinuxLinux4.4.229 < 4.4.230affected
LinuxLinux4.9.229 < 4.9.230affected
LinuxLinux4.14.186 < 4.14.188affected
LinuxLinux4.19.130 < 4.19.132affected
LinuxLinux5.4.49 < 5.4.51affected
LinuxLinux5.7.6 < 5.7.8affected
LinuxLinux5.8affected
LinuxLinux0 < 5.8unaffected
LinuxLinux4.4.230 <= 4.4.*unaffected
LinuxLinux4.9.230 <= 4.9.*unaffected
LinuxLinux4.14.188 <= 4.14.*unaffected
LinuxLinux4.19.132 <= 4.19.*unaffected
LinuxLinux5.4.51 <= 5.4.*unaffected
LinuxLinux5.7.8 <= 5.7.*unaffected
LinuxLinux6.18.10 <= 6.18.*unaffected
LinuxLinux6.19 <= *unaffected

Weaknesses

References