---
id: CVE-2026-80946
title: >-
  kernel: fuse: copy request headers via a stack buffer for io-uring
  (CVE-2026-80946)
summary: >-
  A flaw was found in the Linux kernel's FUSE (Filesystem in Userspace)
  component. The `io-uring` transport attempts to copy request headers directly
  to or from user space without proper memory validation. A local attacker could
  exploit this…
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cvssSource: vendor
cwe: CWE-501
vendor: Red Hat
product: Red Hat OpenShift Container Platform 4
affected:
  - openshift_container_platform 4
published: '2026-09-11'
updated: '2026-09-14'
sourceUpdated: '2026-09-14T16:46:21+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80946.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80946.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-80946'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532123'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-80946'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-80946'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-80946.mbox
  - url: 'https://git.kernel.org/stable/c/194d0fb0ea4720535ff3168c9d04c7632cec7071'
  - url: 'https://git.kernel.org/stable/c/a47a416ff68d706dc3327ab583f86b9ee757358b'
  - url: 'https://git.kernel.org/stable/c/fd10f40af314f07b6d6e028b1ca25c8b49903aab'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.00166
epssPercentile: 0.06259
ingestedAt: '2026-09-14T00:35:28.532Z'
---

## Overview

A flaw was found in the Linux kernel's FUSE (Filesystem in Userspace) component. The `io-uring` transport attempts to copy request headers directly to or from user space without proper memory validation. A local attacker could exploit this vulnerability, leading to a kernel panic and a denial of service. This issue could also potentially result in the exposure of sensitive kernel memory.

## Vendor advisories

- **Red Hat VEX** · Moderate · updated 2026-09-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80946.json)

**kernel: fuse: copy request headers via a stack buffer for io-uring** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-14.

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.