# CVE-2026-93808: Linux kernel ALSA USB audio caiaq buffer over-read

Source: https://junglewise.ai/threats/cve-2026-93808-in-the-linux-kernel-the-following-vulnerability-has-been-resolved  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-24. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-93808 · Severity: info · Published 2026-09-24

The Linux kernel's USB audio driver for Native Instruments Komplete Audio interfaces fails to validate the length of responses from the device before reading fixed-size fields, enabling a malicious or malfunctioning device to trigger out-of-bounds memory reads. An attacker with physical access to connect a malicious USB device could read sensitive kernel memory or cause a denial of service.

Technologies: [Unknown Linux kernel](https://junglewise.ai/threats/technologies/unknown-linux-kernel). Vendors: [Unknown](https://junglewise.ai/threats/vendors/unknown).

## Quick answers

**Is CVE-2026-93808 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-93808 being exploited in the wild.

**How severe is CVE-2026-93808?** Informational severity, published 24 September 2026.

**Which products and versions are affected?** Unknown Linux kernel all versions prior to fix commit aba30af07d4fe499b50209801eba9da8a815522f.

**Is there a fix for CVE-2026-93808?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-93808 attacked?** It is attacked from the adjacent network, in an operating system.

**Am I affected by CVE-2026-93808?** Check whether you run Unknown Linux kernel at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The usb_ep1_command_reply_dispatch() function in sound/usb/caiaq/device.c and snd_caiaq_input_read_analog() in sound/usb/caiaq/input.c access fixed offsets in USB URB buffers without first checking that urb->actual_length contains sufficient bytes. This allows reads of uninitialized kernel memory when a USB device returns truncated responses. The fix adds per-command payload length validation before accessing buffer fields.

## Affected products

- <UNKNOWN> Linux kernel all versions prior to fix commit aba30af07d4fe499b50209801eba9da8a815522f

## Timeline

- 2026-09-24: disclosed

## References

- [https://git.kernel.org/stable/c/74f3c639f64fa5da4e1613149798b5089bce2807](https://git.kernel.org/stable/c/74f3c639f64fa5da4e1613149798b5089bce2807)
- [https://git.kernel.org/stable/c/aba30af07d4fe499b50209801eba9da8a815522f](https://git.kernel.org/stable/c/aba30af07d4fe499b50209801eba9da8a815522f)

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