# CVE-2026-31497: Bluetooth: btusb: clamp SCO altsetting table indices

Status: published. Published: 2026-04-22. Updated: 2026-11-05.

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: btusb: clamp SCO altsetting table indices

btusb_work() maps the number of active SCO links to USB alternate
settings through a three-entry lookup table when CVSD traffic uses
transparent voice settings. The lookup currently indexes alts[] with
data->sco_num - 1 without first constraining sco_num to the number of
available table entries.

While the table only defines alternate settings for up to three SCO
links, data->sco_num comes from hci_conn_num() and is used directly.
Cap the lookup to the last table entry before indexing it so the
driver keeps selecting the highest supported alternate setting without
reading past alts[].

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Linux / Linux: ≥ baac6276c0a9f36f1fe1f00590ef00d2ba5ba626; < 312c4450fe23014665c163f480edd5ad2e27bbb8 (affected, git); ≥ baac6276c0a9f36f1fe1f00590ef00d2ba5ba626; < 9dd13a8641de79bc1bc93da55cdd35259a002683 (affected, git); ≥ baac6276c0a9f36f1fe1f00590ef00d2ba5ba626; < 476c9262b430c38c6a701a3b8176a3f48689085b (affected, git); ≥ baac6276c0a9f36f1fe1f00590ef00d2ba5ba626; < 6fba3c3d48c927e55611a0f5ea34da88138ed0ff (affected, git); ≥ baac6276c0a9f36f1fe1f00590ef00d2ba5ba626; < 834cf890d2c3d29cbfa1ee2376c40469c28ec297 (affected, git); ≥ baac6276c0a9f36f1fe1f00590ef00d2ba5ba626; < 1019028eb124564cf7bca58a16f1df8a1ca30726 (affected, git); ≥ baac6276c0a9f36f1fe1f00590ef00d2ba5ba626; < 21c254202f9d78abe0fcd642a92966deb92bd226 (affected, git); ≥ baac6276c0a9f36f1fe1f00590ef00d2ba5ba626; < 129fa608b6ad08b8ab7178eeb2ec272c993aaccc (affected, git). Source: CNA: Linux
- Linux / Linux: 5.8 (affected); ≥ 0; < 5.8 (unaffected, semver); ≥ 5.10.253; ≤ 5.10.* (unaffected, semver); ≥ 5.15.203; ≤ 5.15.* (unaffected, semver); ≥ 6.1.168; ≤ 6.1.* (unaffected, semver); ≥ 6.6.131; ≤ 6.6.* (unaffected, semver); ≥ 6.12.80; ≤ 6.12.* (unaffected, semver); ≥ 6.18.21; ≤ 6.18.* (unaffected, semver); ≥ 6.19.11; ≤ 6.19.* (unaffected, semver); ≥ 7.0; ≤ * (unaffected, original_commit_for_fix). Source: CNA: Linux

## Severity and prioritization

- CISA KEV: No listing in collected sources

- EPSS: 0.12% as of 2026-11-05; percentile 2.05%

- 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/312c4450fe23014665c163f480edd5ad2e27bbb8 (CNA: Linux)

- https://git.kernel.org/stable/c/9dd13a8641de79bc1bc93da55cdd35259a002683 (CNA: Linux)

- https://git.kernel.org/stable/c/476c9262b430c38c6a701a3b8176a3f48689085b (CNA: Linux)

- https://git.kernel.org/stable/c/6fba3c3d48c927e55611a0f5ea34da88138ed0ff (CNA: Linux)

- https://git.kernel.org/stable/c/834cf890d2c3d29cbfa1ee2376c40469c28ec297 (CNA: Linux)

- https://git.kernel.org/stable/c/1019028eb124564cf7bca58a16f1df8a1ca30726 (CNA: Linux)

- https://git.kernel.org/stable/c/21c254202f9d78abe0fcd642a92966deb92bd226 (CNA: Linux)

- https://git.kernel.org/stable/c/129fa608b6ad08b8ab7178eeb2ec272c993aaccc (CNA: Linux)

## Provenance

- CNA: Linux: https://www.cve.org/CVERecord?id=CVE-2026-31497; retrieved 2026-11-05; source updated 2026-11-05

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-31497; retrieved 2026-11-05; source updated Not reported

Revision: d2f20c6134c7b275ea016459f1ee78532d2589f9cf1d28a3f8def8ae320ae6bc

Canonical: https://y2.dev/cve/CVE-2026-31497

## 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.