ALSA: usb-audio: caiaq: validate EP1 reply lengths (CVE-2026-93808) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-93808

ALSA: usb-audio: caiaq: validate EP1 reply lengths

Answer in brief

CVE-2026-93808 records a Unknown severity vulnerability in ALSA: usb-audio: caiaq: validate EP1 reply lengths. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 24, 2026Updated Sep 24, 2026Source checked Sep 25, 2026First seen by HOL Sep 25, 2026Material review Sep 24, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <af8a172c4f71ac30d625f2966d2389a7fa872819 \|\| >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <74f3c639f64fa5da4e1613149798b5089bce2807 \|\| >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <aba30af07d4fe499b50209801eba9da8a815522f \|\| >=0 <6.12.111 \|\| >=0 <6.18.53	af8a172c4f71ac30d625f2966d2389a7fa872819, 74f3c639f64fa5da4e1613149798b5089bce2807, aba30af07d4fe499b50209801eba9da8a815522f, 6.12.111, 6.18.53

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux.
Review the reported fix. Update Linux/Linux to af8a172c4f71ac30d625f2966d2389a7fa872819 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 24, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 24, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 25, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: caiaq: validate EP1 reply lengths usb_ep1_command_reply_dispatch() uses buf[0] as a command byte and then reads command-specific fixed items from the same URB buffer. Several paths use buf + 1, buf[1], buf[2], or buf + 3 without first proving that urb->actual_length contains those bytes. Add per-command length checks, use a payload length derived from the bytes after the command byte for the control-state copy, and reject short analog input payloads before the input helper reads fixed offsets from the EP1 reply.

Quoted source text, attributed separately from HOL analysis.