CVE-2026-23208

ALSA: usb-audio: Prevent excessive number of frames

State: Published
Severity: Not scored
Published: Feb 14, 2026
Updated: Oct 30, 2026
Reserved: Jan 13, 2026

Description

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

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	02c56650f3c118d3752122996d96173d26bb13aa to before 480a1490c595a242f27493a4544b3efb21b29f6aAffected 5ef30e443e6d3654cccecec99cf481a69a0a6d3b to before ab0b5e92fc36ee82c1bd01fe896d0f775ed5de41Affected 99703c921864a318e3e8aae74fde071b1ff35bea to before 282aba56713bbc58155716b55ca7222b2d9cf3c8Affected 2d50acd7dbd0682a56968ad9551341d7fc5b6eaf to before c4dc012b027c9eb101583011089dea14d744e314Affected aba41867dd66939d336fdf604e4d73b805d8039f to before e0ed5a36fb3ab9e7b9ee45cd17f09f6d5f594360Affected d288dc74f8cf95cb7ae0aaf245b7128627a49bf3 to before d67dde02049e632ba58d3c44a164a74b6a737154Affected f0bd62b64016508938df9babe47f65c2c727d25c to before 581821f4b2ecbf411027b0af82b561ee208f4ba4Affected f0bd62b64016508938df9babe47f65c2c727d25c to before 152fc4f7b4a8af1c0418d2722f3b2729799cc837Affected f0bd62b64016508938df9babe47f65c2c727d25c to before 81e4b0009f2acc841d77a24fd796528b0bf62c4eAffected f0bd62b64016508938df9babe47f65c2c727d25c to before 62932d9ed639a9fa71b4ac1a56766a4b43abb7e4Affected f0bd62b64016508938df9babe47f65c2c727d25c to before ef5749ef8b307bf8717945701b1b79d036af0a15Affected 4.4.229 to before 4.4.230Affected 4.9.229 to before 4.9.230Affected 4.14.186 to before 4.14.188Affected 4.19.130 to before 4.19.132Affected 5.4.49 to before 5.4.51Affected 5.7.6 to before 5.7.8Affected
LinuxLinux	5.8Affected before 5.8Not affected 4.4.230 through 4.4.Not affected 4.9.230 through 4.9.Not affected 4.14.188 through 4.14.Not affected 4.19.132 through 4.19.Not affected 5.4.51 through 5.4.Not affected 5.7.8 through 5.7.Not affected 6.1.191 through 6.1.Not affected 6.6.160 through 6.6.Not affected 6.12.114 through 6.12.Not affected 6.18.10 through 6.18.Not affected 6.19 and laterNot affected

Product

Versions

LinuxLinux

02c56650f3c118d3752122996d96173d26bb13aa to before 480a1490c595a242f27493a4544b3efb21b29f6aAffected
5ef30e443e6d3654cccecec99cf481a69a0a6d3b to before ab0b5e92fc36ee82c1bd01fe896d0f775ed5de41Affected
99703c921864a318e3e8aae74fde071b1ff35bea to before 282aba56713bbc58155716b55ca7222b2d9cf3c8Affected
2d50acd7dbd0682a56968ad9551341d7fc5b6eaf to before c4dc012b027c9eb101583011089dea14d744e314Affected
aba41867dd66939d336fdf604e4d73b805d8039f to before e0ed5a36fb3ab9e7b9ee45cd17f09f6d5f594360Affected
d288dc74f8cf95cb7ae0aaf245b7128627a49bf3 to before d67dde02049e632ba58d3c44a164a74b6a737154Affected
f0bd62b64016508938df9babe47f65c2c727d25c to before 581821f4b2ecbf411027b0af82b561ee208f4ba4Affected
f0bd62b64016508938df9babe47f65c2c727d25c to before 152fc4f7b4a8af1c0418d2722f3b2729799cc837Affected
f0bd62b64016508938df9babe47f65c2c727d25c to before 81e4b0009f2acc841d77a24fd796528b0bf62c4eAffected
f0bd62b64016508938df9babe47f65c2c727d25c to before 62932d9ed639a9fa71b4ac1a56766a4b43abb7e4Affected
f0bd62b64016508938df9babe47f65c2c727d25c to before ef5749ef8b307bf8717945701b1b79d036af0a15Affected
4.4.229 to before 4.4.230Affected
4.9.229 to before 4.9.230Affected
4.14.186 to before 4.14.188Affected
4.19.130 to before 4.19.132Affected
5.4.49 to before 5.4.51Affected
5.7.6 to before 5.7.8Affected

LinuxLinux

5.8Affected
before 5.8Not affected
4.4.230 through 4.4.*Not affected
4.9.230 through 4.9.*Not affected
4.14.188 through 4.14.*Not affected
4.19.132 through 4.19.*Not affected
5.4.51 through 5.4.*Not affected
5.7.8 through 5.7.*Not affected
6.1.191 through 6.1.*Not affected
6.6.160 through 6.6.*Not affected
6.12.114 through 6.12.*Not affected
6.18.10 through 6.18.*Not affected
6.19 and laterNot affected

References

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