ALSA: usbusx2y: validate URB actual_length in interrupt callback (CVE-2026-97929) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-97929

ALSA: usbusx2y: validate URB actual_length in interrupt callback

Answer in brief

CVE-2026-97929 records a Unknown severity vulnerability in ALSA: usbusx2y: validate URB actual_length in interrupt callback. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), 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 25, 2026Updated Sep 25, 2026Source checked Sep 25, 2026First seen by HOL Sep 25, 2026Material review Sep 25, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
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), 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 <c156584999bf15118f523ef6c6fedc5b21f46bd9 \|\| >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b0c30fe6c0d5902bd8a7d1d5720bead5bbe46f7d \|\| >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2770321b358658e0a39fe39ccf6a91ee97a81931 \|\| >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8f5ef203abda9dd36b2af473c7b737d544f807bd	c156584999bf15118f523ef6c6fedc5b21f46bd9, b0c30fe6c0d5902bd8a7d1d5720bead5bbe46f7d, 2770321b358658e0a39fe39ccf6a91ee97a81931, 8f5ef203abda9dd36b2af473c7b737d544f807bd
Linux/Linuxgeneric	2.6.12	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to c156584999bf15118f523ef6c6fedc5b21f46bd9 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 25, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 25, 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: usbusx2y: validate URB actual_length in interrupt callback i_usx2y_in04_int() processes the interrupt URB data without checking urb->actual_length. A short transfer from a malfunctioning device would cause the handler to process uninitialized heap data from the kmalloc-allocated in04_buf, which is then copied to the mmap-accessible ctl_snapshot[] array. Fix by using kzalloc() for in04_buf to zero-initialize the buffer, and adding an actual_length check to skip processing on short transfers while still resubmitting the URB.

Quoted source text, attributed separately from HOL analysis.