---
id: CVE-2026-98585
title: 'kernel: eth: fbnic: Avoid rounding zero ring sizes (CVE-2026-98585)'
summary: >-
  A flaw was found in the Linux kernel's fbnic network driver. A local user with
  administrative privileges could trigger a denial of service (DoS) and crash
  the system by configuring a network ring buffer size of zero. Because the
  driver fai…
severity: medium
cvss: 4.4
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H'
cvssSource: vendor
cwe: CWE-1284
vendor: Red Hat
product: Linux
affected:
  - >-
    Linux >= 6cbf18a05c06090d867ef417a2a30b214d42d171 <
    92c9f2ea634d92adff5403d231ebeda683c5685a
  - >-
    Linux >= 6cbf18a05c06090d867ef417a2a30b214d42d171 <
    491aa3167ae02f219cb2d2de6f4196d28dca03be
  - >-
    Linux >= 6cbf18a05c06090d867ef417a2a30b214d42d171 <
    0160953d8eec75c3c55562158c46442ff1fd410b
  - Linux 6.15
published: '2026-10-18'
updated: '2026-10-20'
sourceUpdated: '2026-10-20T04:08:55+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98585.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98585.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-98585'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2554997'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-98585'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-98585'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98585.mbox
  - url: 'https://git.kernel.org/stable/c/92c9f2ea634d92adff5403d231ebeda683c5685a'
  - url: 'https://git.kernel.org/stable/c/491aa3167ae02f219cb2d2de6f4196d28dca03be'
  - url: 'https://git.kernel.org/stable/c/0160953d8eec75c3c55562158c46442ff1fd410b'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.00166
epssPercentile: 0.058
ingestedAt: '2026-10-18T15:45:12.251Z'
---

## Overview

A flaw was found in the Linux kernel's fbnic network driver. A local user with administrative privileges could trigger a denial of service (DoS) and crash the system by configuring a network ring buffer size of zero. Because the driver fails to validate the input before executing a rounding calculation, processing a zero value causes an undefined operation.

## Vendor advisories

- **Red Hat VEX** · Moderate · updated 2026-10-20 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98585.json)

**kernel: eth: fbnic: Avoid rounding zero ring sizes** — rated Moderate by Red Hat. Released 2026-10-18, updated 2026-10-20.

Not affected:

- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4

## Remediation

Refer to the advisory for fix availability.