CVE-2025-40269

High

In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: Fix potential overflow of PCM transfer buffer The PCM stream data in USB-audio driver is transferred over USB URB packet buffers, and each packet size is determined dynamically. The packet sizes are limited by some factors such as wMaxPacketSize USB descriptor. OTOH, in the current code, the actually used packet sizes are determined only by the rate and the PPS, which may be bigger than the size limit above. This results in a buffer overflow, as reported by syzbot. Basically when the limit is smaller than the calculated packet size, it implies that something is wrong, most likely a weird USB descriptor. So the best option would be just to return an error at the parameter setup time before doing any further operations. This patch introduces such a sanity check, and returns -EINVAL when the packet size is greater than maxpacksize. The comparison with ep->packsize[1] alone should suffice since it's always equal or greater than ep->packsize[0].

Package Linux Kernel
Published 2025-12-06
Last modified 2026-07-30
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

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, 5.10.247, 5.15.197, 6.1.159, 6.6.117, 6.12.59, 6.17.9, 6.18 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 ✓ 5.10.247 5.10.x ✓ 5.15.197 5.15.x ✓ 6.1.159 6.1.x ✓ 6.6.117 6.6.x ✓ 6.12.59 6.12.x ✓ 6.17.9 6.17.x ✓ 6.18

References

13 total
Showing 5 of 13 references View all on NVD

Frequently asked questions

  • What is CVE-2025-40269?

    CVE-2025-40269 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10 . 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-2025-40269 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

  • What is the CVSS score for CVE-2025-40269?

    CVE-2025-40269 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-2025-40269?

    Yes. CVE-2025-40269 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-2025-40269 actively exploited?

    No. CVE-2025-40269 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

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