---
id: CVE-2026-80991
title: 'kernel: net: ravb: serialize PTP clock teardown (CVE-2026-80991)'
summary: >-
  A flaw was found in the Linux kernel's `net: ravb` module. A race condition
  exists during the Precision Time Protocol (PTP) clock teardown. This allows
  the `ravb_ptp_interrupt()` function to attempt to use a PTP clock after it has
  been fre…
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-364
vendor: Red Hat
product: Red Hat OpenShift Container Platform 4
affected:
  - openshift_container_platform 4
published: '2026-09-11'
updated: '2026-09-14'
sourceUpdated: '2026-09-14T20:06:07+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80991.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80991.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-80991'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532440'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-80991'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-80991'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-80991.mbox
  - url: 'https://git.kernel.org/stable/c/1cb9663789c5b7a12fcd419fcca6d6254c398252'
  - url: 'https://git.kernel.org/stable/c/66b50c31419e7946e9aa325a468ad9b64c961a25'
  - url: 'https://git.kernel.org/stable/c/67a82e6f886beed0de8f8da08bb767e68fba952d'
  - url: 'https://git.kernel.org/stable/c/695acb5534a9e366efb47b40c7487fc56488b09b'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
  - score-dispute
epss: 0.0017
epssPercentile: 0.05615
scores:
  vendor: 4.4
  cna: 7.8
ingestedAt: '2026-09-14T15:23:07.476Z'
---

## Overview

A flaw was found in the Linux kernel's `net: ravb` module. A race condition exists during the Precision Time Protocol (PTP) clock teardown. This allows the `ravb_ptp_interrupt()` function to attempt to use a PTP clock after it has been freed by `ptp_clock_unregister()`, leading to a use-after-free vulnerability. This could result in system instability, denial of service, or potentially information disclosure.

## Vendor advisories

- **Red Hat VEX** · Moderate · updated 2026-09-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80991.json)

**kernel: net: ravb: serialize PTP clock teardown** — 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.