High 7.8Published Feb 14, 2026

CVE-2026-23208ALSA: usb-audio: Prevent excessive number of frames

Updated under an hour ago (Oct 27, 2026, 1:50 PM ET)

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Exploited in the last 30 days

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

CVSS: 7.8 HIGH (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 21, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 02c56650f3c118d3752122996d96173d26bb13aa before 480a1490c595a242f27493a4544b3efb21b29f6a; from 5ef30e443e6d3654cccecec99cf481a69a0a6d3b before ab0b5e92fc36ee82c1bd01fe896d0f775ed5de41; 99703c921864a318e3e8aae74fde071b1ff35bea builds before 282aba56713bbc58155716b55ca7222b2d9cf3c8; from 2d50acd7dbd0682a56968ad9551341d7fc5b6eaf before c4dc012b027c9eb101583011089dea14d744e314; from aba41867dd66939d336fdf604e4d73b805d8039f before e0ed5a36fb3ab9e7b9ee45cd17f09f6d5f594360; from d288dc74f8cf95cb7ae0aaf245b7128627a49bf3 before d67dde02049e632ba58d3c44a164a74b6a737154; from f0bd62b64016508938df9babe47f65c2c727d25c before 152fc4f7b4a8af1c0418d2722f3b2729799cc837; from f0bd62b64016508938df9babe47f65c2c727d25c before 81e4b0009f2acc841d77a24fd796528b0bf62c4e; and 8 more ranges	CNA record
linux linux_kernel linux:linux_kernel	from 4.14.186 before 4.14.188; from 4.19.130 before 4.19.132; from 5.4.49 before 5.4.51; from 5.7.6 before 5.7.8; from 5.8 before 6.18.10; 4.4.229; 4.9.229; 6.19; and 4 more ranges	NVD

References

References

https://git.kernel.org/stable/c/480a1490c595a242f27493a4544b3efb21b29f6a	patch
https://git.kernel.org/stable/c/ab0b5e92fc36ee82c1bd01fe896d0f775ed5de41	patch
https://git.kernel.org/stable/c/282aba56713bbc58155716b55ca7222b2d9cf3c8	patch
https://git.kernel.org/stable/c/c4dc012b027c9eb101583011089dea14d744e314	patch
https://git.kernel.org/stable/c/e0ed5a36fb3ab9e7b9ee45cd17f09f6d5f594360	patch
https://git.kernel.org/stable/c/d67dde02049e632ba58d3c44a164a74b6a737154	patch
https://git.kernel.org/stable/c/152fc4f7b4a8af1c0418d2722f3b2729799cc837
https://git.kernel.org/stable/c/81e4b0009f2acc841d77a24fd796528b0bf62c4e
https://git.kernel.org/stable/c/62932d9ed639a9fa71b4ac1a56766a4b43abb7e4	patch
https://git.kernel.org/stable/c/ef5749ef8b307bf8717945701b1b79d036af0a15	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.