CVE-2026-23208

High

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

Package Linux Kernel
Published 2026-02-14
Last modified 2026-03-18
CVSS version 3.1
Patch available
Yes

CVSS 3.1 score

7.8

out of 10
High
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness type

CWE-787

CVE-2026-23208 is a Out-of-bounds Write vulnerability

What is Out-of-bounds Write?

The product writes data past the end or before the beginning of the intended buffer. Learn more on MITRE CWE

Affected versions

Linux kernel versions 4.4.229, 4.9.229, 4.14.186, 4.19.130, 5.4.49, 5.7.6, 5.8 and later are affected. Fixed in 4.4.230, 4.9.230, 4.14.188, 4.19.132, 5.4.51, 5.7.8, 6.18.10, 6.19 and their respective stable series.

Affected from
≥ 4.4.229 ≥ 4.9.229 ≥ 4.14.186 ≥ 4.19.130 ≥ 5.4.49 ≥ 5.7.6 ≥ 5.8
Fixed in
✓ 4.4.230 4.4.x ✓ 4.9.230 4.9.x ✓ 4.14.188 4.14.x ✓ 4.19.132 4.19.x ✓ 5.4.51 5.4.x ✓ 5.7.8 5.7.x ✓ 6.18.10 6.18.x ✓ 6.19

References

The following references provide additional information about CVE-2026-23208 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

8 patch commits total View all on NVD

Frequently asked questions

  • What is CVE-2026-23208?

    CVE-2026-23208 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10 , classified as an Out-of-bounds Write flaw (CWE-787) . It affects Linux kernel versions from 4.4.229 onward and has been patched in 4.4.230, 4.9.230, 4.14.188 and others. CVE-2026-23208 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

  • What is the CVSS score for CVE-2026-23208?

    CVE-2026-23208 has a CVSS score of 7.8 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H .

  • Is there a patch available for CVE-2026-23208?

    Yes — CVE-2026-23208 has been patched. Fixed versions include 4.4.230, 4.9.230, 4.14.188 and others. If you are running Linux kernel 4.4.229 or later up to the fix versions, apply the relevant patch for your kernel branch.

  • Is CVE-2026-23208 actively exploited?

    No — CVE-2026-23208 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

  • What is Out-of-bounds Write (CWE-787)?

    The product writes data past the end or before the beginning of the intended buffer. View CWE-787 on MITRE CWE →

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