# CVE-2026-92382: Usbredir: usbredir: unbounded iso_packet_desc[] index in usbredirhost_iso_packet() leads to heap out-of-bounds write

Status: published. Published: 2026-09-21. Updated: 2026-11-06.

An out-of-bounds write flaw was found in usbredir. Starting an isochronous OUT stream with a transfer count of 1 leaves the stream's single transfer buffer permanently unsubmitted, defeating the bounds check in usbredirhost_iso_packet() and allowing a usbredir peer to write past the end of the packet descriptor array on every subsequent isochronous packet.

## Remediation

- workaround: If USB redirection is not a required feature, consider removing the `usbredir` package. This action will eliminate the attack surface but may affect functionality that relies on USB device redirection, particularly in virtualized environments. (source: CNA: redhat)

## Affected products and versions

- Red Hat / Red Hat Enterprise Linux 10 (usbredir): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 6 (usbredir): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 7 (usbredir): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8 (usbredir): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9 (usbredir): Version range not reported. Source: CNA: redhat

## Severity and prioritization

- CVSS 3.1: 4.1 (medium); CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H; source: CNA: redhat

- CISA KEV: No listing in collected sources

- EPSS: 0.14% as of 2026-11-05; percentile 3.03%

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

- Weaknesses: CWE-787

## Exploit evidence

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

## References

- https://access.redhat.com/security/cve/CVE-2026-92382 (CNA: redhat; vdb-entry, x_refsource_REDHAT)

- https://bugzilla.redhat.com/show_bug.cgi?id=2535972 (CNA: redhat; issue-tracking, x_refsource_REDHAT)

## Provenance

- CNA: redhat: https://www.cve.org/CVERecord?id=CVE-2026-92382; retrieved 2026-11-06; source updated 2026-11-06

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-92382; retrieved 2026-11-06; source updated Not reported

Revision: b2aca71e1b4b551c4b48336e5591649bd51a786964d7626244a9c16622279ca9

Canonical: https://y2.dev/cve/CVE-2026-92382

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