Linux Kernel ALSA usb-audio OOB in URB buffer overflow
CVE-2026-23208 Published on February 14, 2026
ALSA: usb-audio: Prevent excessive number of frames
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
Products Associated with CVE-2026-23208
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Affected Versions
Linux:- Version 02c56650f3c118d3752122996d96173d26bb13aa and below 480a1490c595a242f27493a4544b3efb21b29f6a is affected.
- Version 5ef30e443e6d3654cccecec99cf481a69a0a6d3b and below ab0b5e92fc36ee82c1bd01fe896d0f775ed5de41 is affected.
- Version 99703c921864a318e3e8aae74fde071b1ff35bea and below 282aba56713bbc58155716b55ca7222b2d9cf3c8 is affected.
- Version 2d50acd7dbd0682a56968ad9551341d7fc5b6eaf and below c4dc012b027c9eb101583011089dea14d744e314 is affected.
- Version aba41867dd66939d336fdf604e4d73b805d8039f and below e0ed5a36fb3ab9e7b9ee45cd17f09f6d5f594360 is affected.
- Version d288dc74f8cf95cb7ae0aaf245b7128627a49bf3 and below d67dde02049e632ba58d3c44a164a74b6a737154 is affected.
- Version f0bd62b64016508938df9babe47f65c2c727d25c and below 62932d9ed639a9fa71b4ac1a56766a4b43abb7e4 is affected.
- Version f0bd62b64016508938df9babe47f65c2c727d25c and below ef5749ef8b307bf8717945701b1b79d036af0a15 is affected.
- Version 5.8 is affected.
- Before 5.8 is unaffected.
- Version 4.4.230, <= 4.4.* is unaffected.
- Version 4.9.230, <= 4.9.* is unaffected.
- Version 4.14.188, <= 4.14.* is unaffected.
- Version 4.19.132, <= 4.19.* is unaffected.
- Version 5.4.51, <= 5.4.* is unaffected.
- Version 5.7.8, <= 5.7.* is unaffected.
- Version 6.18.10, <= 6.18.* is unaffected.
- Version 6.19, <= * is unaffected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.