CVE-2026-23318
Out-of-Bounds Read in Linux ALSA USB-Audio UAC3 Validation
Publication date: 2026-03-25
Last updated on: 2026-04-23
Assigner: kernel.org
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| linux | linux_kernel | 5.4 |
| linux | linux_kernel | From 4.19.84 (inc) to 4.20 (exc) |
| linux | linux_kernel | From 5.3.11 (inc) to 5.4 (exc) |
| linux | linux_kernel | From 6.19 (inc) to 6.19.7 (exc) |
| linux | linux_kernel | 7.0 |
| linux | linux_kernel | 7.0 |
| linux | linux_kernel | 7.0 |
| linux | linux_kernel | 7.0 |
| linux | linux_kernel | 7.0 |
| linux | linux_kernel | 7.0 |
| linux | linux_kernel | 7.0 |
| linux | linux_kernel | From 6.13 (inc) to 6.18.17 (exc) |
| linux | linux_kernel | From 6.2 (inc) to 6.6.130 (exc) |
| linux | linux_kernel | From 6.7 (inc) to 6.12.77 (exc) |
| linux | linux_kernel | From 5.11 (inc) to 5.15.203 (exc) |
| linux | linux_kernel | From 5.16 (inc) to 6.1.167 (exc) |
| linux | linux_kernel | From 5.4.1 (inc) to 5.10.253 (exc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-125 | The product reads data past the end, or before the beginning, of the intended buffer. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability exists in the Linux kernel's ALSA usb-audio driver related to the validation of USB Audio Class 3 (UAC3) header descriptors.
The validators table entry for the UAC3 Audio Control (AC) header descriptor incorrectly uses the protocol version UAC_VERSION_2 instead of UAC_VERSION_3.
As a result, the validator never matches actual UAC3 devices, causing their header descriptors to bypass validation entirely.
A malicious USB device presenting a truncated UAC3 header could exploit this flaw to cause out-of-bounds reads when the driver accesses unvalidated descriptor fields.
This bug was introduced due to a copy-paste error when the UAC3 section was created from the UAC2 section.
How can this vulnerability impact me? :
This vulnerability can allow a malicious USB device to cause out-of-bounds memory reads in the Linux kernel's usb-audio driver.
Such out-of-bounds reads can potentially lead to system instability, crashes, or information disclosure depending on how the kernel handles the invalid memory access.
If an attacker has physical access to connect a malicious USB device, they could exploit this vulnerability to affect the security and reliability of the affected system.