ALSA: usb-audio: Fix out-of-bounds read in snd_usb_get_audioformat_uac3()
In snd_usb_get_audioformat_uac3(), the length value returned from
snd_usb_ctl_msg() is used directly for memory allocation without
validation. This length is controlled by the USB device.
The allocated buffer is cast to a uac3_cluster_header_descriptor
and its fields are accessed without verifying that the buffer
is large enough. If the device returns a smaller than expected
length, this leads to an out-of-bounds read.
Add a length check to ensure the buffer is large enough for
uac3_cluster_header_descriptor.
Metrics
Affected Vendors & Products
| Source | ID | Title |
|---|---|---|
Debian DLA |
DLA-4327-1 | linux security update |
Debian DLA |
DLA-4328-1 | linux-6.1 security update |
Debian DSA |
DSA-5973-1 | linux security update |
EUVD |
EUVD-2025-20812 | In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: Fix out-of-bounds read in snd_usb_get_audioformat_uac3() In snd_usb_get_audioformat_uac3(), the length value returned from snd_usb_ctl_msg() is used directly for memory allocation without validation. This length is controlled by the USB device. The allocated buffer is cast to a uac3_cluster_header_descriptor and its fields are accessed without verifying that the buffer is large enough. If the device returns a smaller than expected length, this leads to an out-of-bounds read. Add a length check to ensure the buffer is large enough for uac3_cluster_header_descriptor. |
Ubuntu USN |
USN-7774-1 | Linux kernel vulnerabilities |
Ubuntu USN |
USN-7774-2 | Linux kernel (FIPS) vulnerabilities |
Ubuntu USN |
USN-7774-3 | Linux kernel (Real-time) vulnerabilities |
Ubuntu USN |
USN-7775-1 | Linux kernel (Azure FIPS) vulnerabilities |
Ubuntu USN |
USN-7775-2 | Linux kernel (Azure) vulnerabilities |
Ubuntu USN |
USN-7776-1 | Linux kernel (Oracle) vulnerabilities |
Ubuntu USN |
USN-7775-3 | Linux kernel (Azure) vulnerabilities |
Ubuntu USN |
USN-7774-4 | Linux kernel (KVM) vulnerabilities |
Ubuntu USN |
USN-7774-5 | Linux kernel (NVIDIA Tegra IGX) vulnerabilities |
Ubuntu USN |
USN-7833-1 | Linux kernel vulnerabilities |
Ubuntu USN |
USN-7834-1 | Linux kernel (Azure) vulnerabilities |
Ubuntu USN |
USN-7833-2 | Linux kernel (Real-time) vulnerabilities |
Ubuntu USN |
USN-7833-3 | Linux kernel (AWS) vulnerabilities |
Ubuntu USN |
USN-7833-4 | Linux kernel (GCP) vulnerabilities |
Solution
No solution given by the vendor.
Workaround
No workaround given by the vendor.
Mon, 03 Nov 2025 18:30:00 +0000
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Thu, 17 Jul 2025 17:15:00 +0000
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Tue, 15 Jul 2025 13:45:00 +0000
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| Metrics |
epss
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epss
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Fri, 11 Jul 2025 13:45:00 +0000
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| Metrics |
epss
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epss
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Thu, 10 Jul 2025 14:30:00 +0000
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| References |
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Thu, 10 Jul 2025 00:45:00 +0000
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| Metrics |
threat_severity
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cvssV3_1
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Wed, 09 Jul 2025 10:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: Fix out-of-bounds read in snd_usb_get_audioformat_uac3() In snd_usb_get_audioformat_uac3(), the length value returned from snd_usb_ctl_msg() is used directly for memory allocation without validation. This length is controlled by the USB device. The allocated buffer is cast to a uac3_cluster_header_descriptor and its fields are accessed without verifying that the buffer is large enough. If the device returns a smaller than expected length, this leads to an out-of-bounds read. Add a length check to ensure the buffer is large enough for uac3_cluster_header_descriptor. | |
| Title | ALSA: usb-audio: Fix out-of-bounds read in snd_usb_get_audioformat_uac3() | |
| References |
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Status: PUBLISHED
Assigner: Linux
Published:
Updated: 2025-11-03T17:35:57.073Z
Reserved: 2025-04-16T04:51:23.997Z
Link: CVE-2025-38249
No data.
Status : Awaiting Analysis
Published: 2025-07-09T11:15:27.077
Modified: 2025-11-03T18:16:10.943
Link: CVE-2025-38249
OpenCVE Enrichment
Updated: 2025-07-13T21:08:06Z
Debian DLA
Debian DSA
EUVD
Ubuntu USN