# CVE-2026-43429: USB: usbtmc: Use usb_bulk_msg_killable() with user-specified timeouts

Status: published. Published: 2026-05-08. Updated: 2026-11-06.

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

USB: usbtmc: Use usb_bulk_msg_killable() with user-specified timeouts

The usbtmc driver accepts timeout values specified by the user in an
ioctl command, and uses these timeouts for some usb_bulk_msg() calls.
Since the user can specify arbitrarily long timeouts and
usb_bulk_msg() uses unkillable waits, call usb_bulk_msg_killable()
instead to avoid the possibility of the user hanging a kernel thread
indefinitely.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Linux / Linux: ≥ 048c6d88a0214757926f264823829e79154fcd4f; < e14a0dcdf468c3ad616bb06696c7c64c36e736d8 (affected, git); ≥ 048c6d88a0214757926f264823829e79154fcd4f; < 7fa72c369c23c27d1f64883c1e276af950557fb1 (affected, git); ≥ 048c6d88a0214757926f264823829e79154fcd4f; < 72c0a063489be183cfb99e7050aaef503bdb6449 (affected, git); ≥ 048c6d88a0214757926f264823829e79154fcd4f; < 39bd4097292fd8564cf2cfba9356f8ab11e38d12 (affected, git); ≥ 048c6d88a0214757926f264823829e79154fcd4f; < 0535f84cb94c9d8bcba0a2a5b3fac81b7d97235d (affected, git); ≥ 048c6d88a0214757926f264823829e79154fcd4f; < 6cb7dc91f057dd8ce44f6caa2995d8e22784ed0a (affected, git); ≥ 048c6d88a0214757926f264823829e79154fcd4f; < d4f1c45bdff3f393f9ab7e76795901c442b9eb76 (affected, git); ≥ 048c6d88a0214757926f264823829e79154fcd4f; < 7784caa413a89487dd14dd5c41db8753483b2acb (affected, git). Source: CNA: Linux
- Linux / Linux: 4.19 (affected); ≥ 0; < 4.19 (unaffected, semver); ≥ 5.10.253; ≤ 5.10.* (unaffected, semver); ≥ 5.15.203; ≤ 5.15.* (unaffected, semver); ≥ 6.1.167; ≤ 6.1.* (unaffected, semver); ≥ 6.6.130; ≤ 6.6.* (unaffected, semver); ≥ 6.12.78; ≤ 6.12.* (unaffected, semver); ≥ 6.18.19; ≤ 6.18.* (unaffected, semver); ≥ 6.19.9; ≤ 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 2026-11-06; percentile 2.04%

- 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/e14a0dcdf468c3ad616bb06696c7c64c36e736d8 (CNA: Linux)

- https://git.kernel.org/stable/c/7fa72c369c23c27d1f64883c1e276af950557fb1 (CNA: Linux)

- https://git.kernel.org/stable/c/72c0a063489be183cfb99e7050aaef503bdb6449 (CNA: Linux)

- https://git.kernel.org/stable/c/39bd4097292fd8564cf2cfba9356f8ab11e38d12 (CNA: Linux)

- https://git.kernel.org/stable/c/0535f84cb94c9d8bcba0a2a5b3fac81b7d97235d (CNA: Linux)

- https://git.kernel.org/stable/c/6cb7dc91f057dd8ce44f6caa2995d8e22784ed0a (CNA: Linux)

- https://git.kernel.org/stable/c/d4f1c45bdff3f393f9ab7e76795901c442b9eb76 (CNA: Linux)

- https://git.kernel.org/stable/c/7784caa413a89487dd14dd5c41db8753483b2acb (CNA: Linux)

## Provenance

- CNA: Linux: https://www.cve.org/CVERecord?id=CVE-2026-43429; retrieved 2026-11-06; source updated 2026-11-06

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-43429; retrieved 2026-11-06; source updated Not reported

Revision: 0bce4808a7ba09f4327388c7c4bb7201914ecef819ad66da4083c76ff79ecaf0

Canonical: https://y2.dev/cve/CVE-2026-43429

## Agent and API access

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- 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.