CVE-2025-40269

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Source
https://cve.org/CVERecord?id=CVE-2025-40269
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-40269.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2025-40269
Downstream
Related
Published
2025-12-06T21:50:50.229Z
Modified
2026-03-28T17:44:14.708804252Z
Summary
ALSA: usb-audio: Fix potential overflow of PCM transfer buffer
Details

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].

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/40xxx/CVE-2025-40269.json",
    "cna_assigner": "Linux"
}
References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
02c56650f3c118d3752122996d96173d26bb13aa
Fixed
480a1490c595a242f27493a4544b3efb21b29f6a
Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
5ef30e443e6d3654cccecec99cf481a69a0a6d3b
Fixed
ab0b5e92fc36ee82c1bd01fe896d0f775ed5de41
Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
99703c921864a318e3e8aae74fde071b1ff35bea
Fixed
282aba56713bbc58155716b55ca7222b2d9cf3c8
Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
2d50acd7dbd0682a56968ad9551341d7fc5b6eaf
Fixed
c4dc012b027c9eb101583011089dea14d744e314
Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
aba41867dd66939d336fdf604e4d73b805d8039f
Fixed
e0ed5a36fb3ab9e7b9ee45cd17f09f6d5f594360
Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
d288dc74f8cf95cb7ae0aaf245b7128627a49bf3
Fixed
d67dde02049e632ba58d3c44a164a74b6a737154
Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
f0bd62b64016508938df9babe47f65c2c727d25c
Fixed
6a5da3fa80affc948923f20a4e086177f505e86e
Fixed
217d47255a2ec8b246f2725f5db9ac3f1d4109d7
Fixed
ef592bf2232a2daa9fffa8881881fc9957ea56e9
Fixed
ece3b981bb6620e47fac826a2156c090b1a936a0
Fixed
98e9d5e33bda8db875cc1a4fe99c192658e45ab6
Fixed
d2c04f20ccc6c0d219e6d3038bab45bc66a178ad
Fixed
05a1fc5efdd8560f34a3af39c9cf1e1526cc3ddf

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-40269.json"

Linux / Kernel

Package

Name
Kernel

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
4.4.230
Type
ECOSYSTEM
Events
Introduced
4.5.0
Fixed
4.9.230
Type
ECOSYSTEM
Events
Introduced
4.10.0
Fixed
4.14.188
Type
ECOSYSTEM
Events
Introduced
4.15.0
Fixed
4.19.132
Type
ECOSYSTEM
Events
Introduced
4.20.0
Fixed
5.4.51
Type
ECOSYSTEM
Events
Introduced
5.5.0
Fixed
5.7.8
Type
ECOSYSTEM
Events
Introduced
5.8.0
Fixed
5.10.247
Fixed
5.15.197
Type
ECOSYSTEM
Events
Introduced
5.11.0
Fixed
6.1.159
Type
ECOSYSTEM
Events
Introduced
5.16.0
Fixed
6.6.117
Type
ECOSYSTEM
Events
Introduced
6.2.0
Fixed
6.12.59
Type
ECOSYSTEM
Events
Introduced
6.7.0
Fixed
6.17.9

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-40269.json"