---
id: CVE-2026-68365
title: 'USB: serial: io_edgeport: cap received transmit credits'
summary: |-
  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…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    d9dd87bc1d7e8476d29d68883542ec6198d385c6
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    5b39d3da15344b87ef54a0a04f65b52622747e99
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    63c4e55d0741cfaf00515e807cad9293445cd348
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    ee57992c053a6d395e98ced2d4c9cc3b42d8c27a
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    64b687f9694777754285d489abbefa3784bc78da
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    cbe00048b69d67c8a78293cb7681b4c9963b26c7
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    1e47d8228b8767c8ac722aedb388f70adeeda43d
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    faaddd811c5099f11a5f52e68a6b31a5898cda4f
  - Linux 2.6.12
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-06T16:48:12.644775Z'
published: '2026-08-10'
updated: '2026-11-06'
sourceUpdated: '2026-11-06T16:55:14.547Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-68365'
references:
  - url: 'https://git.kernel.org/stable/c/d9dd87bc1d7e8476d29d68883542ec6198d385c6'
  - url: 'https://git.kernel.org/stable/c/5b39d3da15344b87ef54a0a04f65b52622747e99'
  - url: 'https://git.kernel.org/stable/c/63c4e55d0741cfaf00515e807cad9293445cd348'
  - url: 'https://git.kernel.org/stable/c/ee57992c053a6d395e98ced2d4c9cc3b42d8c27a'
  - url: 'https://git.kernel.org/stable/c/64b687f9694777754285d489abbefa3784bc78da'
  - url: 'https://git.kernel.org/stable/c/cbe00048b69d67c8a78293cb7681b4c9963b26c7'
  - url: 'https://git.kernel.org/stable/c/1e47d8228b8767c8ac722aedb388f70adeeda43d'
  - url: 'https://git.kernel.org/stable/c/faaddd811c5099f11a5f52e68a6b31a5898cda4f'
tags:
  - cve.org
epss: 0.00184
epssPercentile: 0.08081
ingestedAt: '2026-11-06T18:00:12.607Z'
---

## Overview

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.

## Affected

- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < d9dd87bc1d7e8476d29d68883542ec6198d385c6`
- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 5b39d3da15344b87ef54a0a04f65b52622747e99`
- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 63c4e55d0741cfaf00515e807cad9293445cd348`
- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < ee57992c053a6d395e98ced2d4c9cc3b42d8c27a`
- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 64b687f9694777754285d489abbefa3784bc78da`
- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < cbe00048b69d67c8a78293cb7681b4c9963b26c7`
- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 1e47d8228b8767c8ac722aedb388f70adeeda43d`
- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < faaddd811c5099f11a5f52e68a6b31a5898cda4f`
- `Linux 2.6.12`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.