# CVE-2026-43428: USB: core: Limit the length of unkillable synchronous timeouts

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

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

USB: core: Limit the length of unkillable synchronous timeouts

The usb_control_msg(), usb_bulk_msg(), and usb_interrupt_msg() APIs in
usbcore allow unlimited timeout durations.  And since they use
uninterruptible waits, this leaves open the possibility of hanging a
task for an indefinitely long time, with no way to kill it short of
unplugging the target device.

To prevent this sort of problem, enforce a maximum limit on the length
of these unkillable timeouts.  The limit chosen here, somewhat
arbitrarily, is 60 seconds.  On many systems (although not all) this
is short enough to avoid triggering the kernel's hung-task detector.

In addition, clear up the ambiguity of negative timeout values by
treating them the same as 0, i.e., using the maximum allowed timeout.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Linux / Linux: ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2; < 4e86f5b79e62ded7e3c3ebd688cf5775e618148a (affected, git); ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2; < 06d2bbc4c66c6b0e8a43728c4949026026a5be67 (affected, git); ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2; < 6c62935670acdbb7687ced20494923b66fbb0367 (affected, git); ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2; < 659c0c7d50a4b0f6aa197c4c098cfd91daf63862 (affected, git); ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2; < 24b31a227f679a942d820840a4dea7f0c09a387f (affected, git); ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2; < 64f3d75633aedc12bdff220e9a4337177430bd9d (affected, git); ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2; < 2d34cb4d1d6283b4be9c78f4a83ed6956d3069ec (affected, git); ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2; < 1015c27a5e1a63efae2b18a9901494474b4d1dc3 (affected, git). Source: CNA: Linux
- Linux / Linux: 2.6.12 (affected); ≥ 0; < 2.6.12 (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/4e86f5b79e62ded7e3c3ebd688cf5775e618148a (CNA: Linux)

- https://git.kernel.org/stable/c/06d2bbc4c66c6b0e8a43728c4949026026a5be67 (CNA: Linux)

- https://git.kernel.org/stable/c/6c62935670acdbb7687ced20494923b66fbb0367 (CNA: Linux)

- https://git.kernel.org/stable/c/659c0c7d50a4b0f6aa197c4c098cfd91daf63862 (CNA: Linux)

- https://git.kernel.org/stable/c/24b31a227f679a942d820840a4dea7f0c09a387f (CNA: Linux)

- https://git.kernel.org/stable/c/64f3d75633aedc12bdff220e9a4337177430bd9d (CNA: Linux)

- https://git.kernel.org/stable/c/2d34cb4d1d6283b4be9c78f4a83ed6956d3069ec (CNA: Linux)

- https://git.kernel.org/stable/c/1015c27a5e1a63efae2b18a9901494474b4d1dc3 (CNA: Linux)

## Provenance

- CNA: Linux: https://www.cve.org/CVERecord?id=CVE-2026-43428; retrieved 2026-11-06; source updated 2026-11-06

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-43428; retrieved 2026-11-06; source updated Not reported

Revision: 3af3e46754ec2add6039b7b6f672f92857b7e4a0d0764f035d96fbc68dcc8be1

Canonical: https://y2.dev/cve/CVE-2026-43428

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