---
id: CVE-2026-89487
title: >-
  kernel: openvswitch: only skb_tx_error() a packet we are about to drop
  (CVE-2026-89487)
summary: >-
  A flaw was found in openvswitch in the Linux kernel. This vulnerability occurs
  when the `queue_userspace_packet()` function incorrectly modifies a shared
  network packet buffer by stripping a critical flag. This action can lead to an
  unpriv…
severity: high
cvss: 7
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'
cvssSource: vendor
cwe: CWE-367
vendor: Red Hat
product: Red Hat Enterprise Linux 9
affected:
  - enterprise_linux 10
  - enterprise_linux 7
  - enterprise_linux 8
  - enterprise_linux 9
  - openshift_container_platform 4
  - enterprise_linux 6
published: '2026-09-11'
updated: '2026-09-15'
sourceUpdated: '2026-09-15T08:13:00+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89487.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89487.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89487'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532517'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89487'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89487'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89487.mbox
  - url: 'https://git.kernel.org/stable/c/5de5d554141a15b3f1f5c978fd9f7f4fd6d0600a'
  - url: 'https://git.kernel.org/stable/c/48db11e115d1b232edc5591604adc6eda95cd545'
  - url: 'https://git.kernel.org/stable/c/4477222e2916a18e273edc139c955ade6bbb7a69'
  - url: 'https://git.kernel.org/stable/c/4d5c460ef8754be1d43b16dbf02695b008b207d6'
  - url: 'https://git.kernel.org/stable/c/6767d70cf46f65807a6a4c4406a518e6c12e36ae'
  - url: 'https://git.kernel.org/stable/c/e41a59fc056f63a7a1f42788913c53cc48d744aa'
  - url: 'https://git.kernel.org/stable/c/5d85eef222cfd28e73deed7402c100229e8b9e6e'
  - url: 'https://git.kernel.org/stable/c/0dbc2398fca3bb33eda963849f865ddb1b3aa05e'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.00129
epssPercentile: 0.02914
scores:
  vendor: 7
  cna: 7.8
ingestedAt: '2026-09-14T15:23:07.452Z'
---

## Overview

A flaw was found in openvswitch in the Linux kernel. This vulnerability occurs when the `queue_userspace_packet()` function incorrectly modifies a shared network packet buffer by stripping a critical flag. This action can lead to an unprivileged page-cache write, allowing a local attacker to modify data in memory that they should not have access to. This could potentially result in information disclosure or privilege escalation.

## Vendor advisories

- **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4, Red Hat Enterprise Linux 6 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, … · updated 2026-09-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89487.json)

**kernel: openvswitch: only skb_tx_error() a packet we are about to drop** — rated Important by Red Hat. Released 2026-09-11, updated 2026-09-15.

Affected:

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

No fix planned:

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

## Remediation

Affected