# CVE-2025-38249: ALSA: usb-audio: Fix out-of-bounds read in snd_usb_get_audioformat_uac3()

Status: published. Published: 2025-07-09. Updated: 2026-11-05.

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.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Linux / Linux: ≥ 9a2fe9b801f585baccf8352d82839dcd54b300cf; < 24ff7d465c4284529bbfa207757bffb6f44b6403 (affected, git); ≥ 9a2fe9b801f585baccf8352d82839dcd54b300cf; < 2dc1c3edf67abd30c757f8054a5da61927cdda21 (affected, git); ≥ 9a2fe9b801f585baccf8352d82839dcd54b300cf; < c3fb926abe90d86f5e3055e0035f04d9892a118b (affected, git); ≥ 9a2fe9b801f585baccf8352d82839dcd54b300cf; < 6eb211788e1370af52a245d4d7da35c374c7b401 (affected, git); ≥ 9a2fe9b801f585baccf8352d82839dcd54b300cf; < 74fcb3852a2f579151ce80b9ed96cd916ba0d5d8 (affected, git); ≥ 9a2fe9b801f585baccf8352d82839dcd54b300cf; < 0ee87c2814deb5e42921281116ac3abcb326880b (affected, git); ≥ 9a2fe9b801f585baccf8352d82839dcd54b300cf; < 11e740dc1a2c8590eb7074b5c4ab921bb6224c36 (affected, git); ≥ 9a2fe9b801f585baccf8352d82839dcd54b300cf; < fb4e2a6e8f28a3c0ad382e363aeb9cd822007b8a (affected, git). Source: CNA: Linux
- Linux / Linux: 4.17 (affected); ≥ 0; < 4.17 (unaffected, semver); ≥ 5.4.296; ≤ 5.4.* (unaffected, semver); ≥ 5.10.240; ≤ 5.10.* (unaffected, semver); ≥ 5.15.187; ≤ 5.15.* (unaffected, semver); ≥ 6.1.143; ≤ 6.1.* (unaffected, semver); ≥ 6.6.96; ≤ 6.6.* (unaffected, semver); ≥ 6.12.36; ≤ 6.12.* (unaffected, semver); ≥ 6.15.5; ≤ 6.15.* (unaffected, semver); ≥ 6.16; ≤ * (unaffected, original_commit_for_fix). Source: CNA: Linux

## Severity and prioritization

- CISA KEV: No listing in collected sources

- EPSS: 0.19% as of 2026-11-05; percentile 8.26%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: Not reported

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://git.kernel.org/stable/c/24ff7d465c4284529bbfa207757bffb6f44b6403 (CNA: Linux)

- https://git.kernel.org/stable/c/2dc1c3edf67abd30c757f8054a5da61927cdda21 (CNA: Linux)

- https://git.kernel.org/stable/c/c3fb926abe90d86f5e3055e0035f04d9892a118b (CNA: Linux)

- https://git.kernel.org/stable/c/6eb211788e1370af52a245d4d7da35c374c7b401 (CNA: Linux)

- https://git.kernel.org/stable/c/74fcb3852a2f579151ce80b9ed96cd916ba0d5d8 (CNA: Linux)

- https://git.kernel.org/stable/c/0ee87c2814deb5e42921281116ac3abcb326880b (CNA: Linux)

- https://git.kernel.org/stable/c/11e740dc1a2c8590eb7074b5c4ab921bb6224c36 (CNA: Linux)

- https://git.kernel.org/stable/c/fb4e2a6e8f28a3c0ad382e363aeb9cd822007b8a (CNA: Linux)

- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html (ADP: CVE)

- https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html (ADP: CVE)

## Provenance

- CNA: Linux: https://www.cve.org/CVERecord?id=CVE-2025-38249; retrieved 2026-11-05; source updated 2026-11-05

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2025-38249; retrieved 2026-11-05; source updated Not reported

Revision: aa1362ee1bf96620b9a1f7b3fe2dd75f2d46f9850b6c60d0a26664164975c7ae

Canonical: https://y2.dev/cve/CVE-2025-38249

## Agent and API access

Public CVE pages, Markdown, and JSON are free to read without an account or API key.

- Public catalog: https://y2.dev/cve/index.json. Follow nextCursor with the same search, filters, sort, and limit (1–100). A null cursor marks the end.

- WebMCP: search_cve_disclosures, get_cve_disclosure, get_cve_page_markdown, get_y2_cve_access. Available in compatible browsers.

- Cyber API: https://api.y2.dev/api/v2/cyber/cves and https://api.y2.dev/api/v2/cyber/cves/{cveId}.

- Y2 Pro or Elite: create a workspace API key with the intel:cyber scope and send Authorization: Bearer <Y2_API_KEY>. Setup: https://y2.dev/docs/api/create-key.

- x402: Pay per request without an account or API key. Omit Authorization, read the HTTP 402 PAYMENT-REQUIRED challenge, validate its current requirements, and retry with PAYMENT-SIGNATURE through an authorized payment client. These browser tools never make payments. Guide: https://y2.dev/docs/api/x402.

- OpenAPI: https://y2.dev/api/openapi.yaml. Agent access metadata: https://y2.dev/cve/agent.json.

Collected public records only. Check source status for coverage and freshness.