# CVE-2026-68365: USB: serial: io_edgeport: cap received transmit credits

Status: published. Published: 2026-08-10. Updated: 2026-11-06.

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

USB: serial: io_edgeport: cap received transmit credits

The interrupt-status packet reports transmit credits returned by the
device. edge_interrupt_callback() adds the 16-bit value to txCredits
without checking maxTxCredits.

edge_write() uses txCredits minus the software FIFO count as the amount
of data that fits. Since the FIFO is allocated with maxTxCredits bytes,
txCredits exceeding maxTxCredits can cause OOB write in ring buffer.

Cap accumulated credits at maxTxCredits. Conforming devices should never
hit the cap.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Linux / Linux: ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2; < d9dd87bc1d7e8476d29d68883542ec6198d385c6 (affected, git); ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2; < 5b39d3da15344b87ef54a0a04f65b52622747e99 (affected, git); ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2; < 63c4e55d0741cfaf00515e807cad9293445cd348 (affected, git); ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2; < ee57992c053a6d395e98ced2d4c9cc3b42d8c27a (affected, git); ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2; < 64b687f9694777754285d489abbefa3784bc78da (affected, git); ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2; < cbe00048b69d67c8a78293cb7681b4c9963b26c7 (affected, git); ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2; < 1e47d8228b8767c8ac722aedb388f70adeeda43d (affected, git); ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2; < faaddd811c5099f11a5f52e68a6b31a5898cda4f (affected, git). Source: CNA: Linux
- Linux / Linux: 2.6.12 (affected); ≥ 0; < 2.6.12 (unaffected, semver); ≥ 5.10.265; ≤ 5.10.* (unaffected, semver); ≥ 5.15.216; ≤ 5.15.* (unaffected, semver); ≥ 6.1.183; ≤ 6.1.* (unaffected, semver); ≥ 6.6.148; ≤ 6.6.* (unaffected, semver); ≥ 6.12.101; ≤ 6.12.* (unaffected, semver); ≥ 6.18.42; ≤ 6.18.* (unaffected, semver); ≥ 7.1.6; ≤ 7.1.* (unaffected, semver); ≥ 7.2; ≤ * (unaffected, original_commit_for_fix). Source: CNA: Linux

## Severity and prioritization

- CISA KEV: No listing in collected sources

- EPSS: 0.18% as of 2026-11-06; percentile 8.11%

- 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/d9dd87bc1d7e8476d29d68883542ec6198d385c6 (CNA: Linux)

- https://git.kernel.org/stable/c/5b39d3da15344b87ef54a0a04f65b52622747e99 (CNA: Linux)

- https://git.kernel.org/stable/c/63c4e55d0741cfaf00515e807cad9293445cd348 (CNA: Linux)

- https://git.kernel.org/stable/c/ee57992c053a6d395e98ced2d4c9cc3b42d8c27a (CNA: Linux)

- https://git.kernel.org/stable/c/64b687f9694777754285d489abbefa3784bc78da (CNA: Linux)

- https://git.kernel.org/stable/c/cbe00048b69d67c8a78293cb7681b4c9963b26c7 (CNA: Linux)

- https://git.kernel.org/stable/c/1e47d8228b8767c8ac722aedb388f70adeeda43d (CNA: Linux)

- https://git.kernel.org/stable/c/faaddd811c5099f11a5f52e68a6b31a5898cda4f (CNA: Linux)

- https://git.kernel.org/stable/c/1e47d8228b8767c8ac722aedb388f70adeeda43d (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/5b39d3da15344b87ef54a0a04f65b52622747e99 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/63c4e55d0741cfaf00515e807cad9293445cd348 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/64b687f9694777754285d489abbefa3784bc78da (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/cbe00048b69d67c8a78293cb7681b4c9963b26c7 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/d9dd87bc1d7e8476d29d68883542ec6198d385c6 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/ee57992c053a6d395e98ced2d4c9cc3b42d8c27a (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/faaddd811c5099f11a5f52e68a6b31a5898cda4f (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

## Provenance

- CNA: Linux: https://www.cve.org/CVERecord?id=CVE-2026-68365; retrieved 2026-11-06; source updated 2026-11-06

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-68365; retrieved 2026-11-06; source updated 2026-11-06

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-68365; retrieved 2026-11-06; source updated Not reported

Revision: b4f3a9761de58b631f4041d48e1c2c37027c3e33dae0c28ef34ca805571e96c6

Canonical: https://y2.dev/cve/CVE-2026-68365

## 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.