---
id: CVE-2026-80992
title: 'net: ravb: avoid dereferencing an invalid PTP clock'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  net: ravb: avoid dereferencing an invalid PTP clock

  The PTP clock is unavailable before the first open, so querying its
  index can dereference a NULL pointer. Registrat…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-476
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= a0d2f20650e81407d8e51ad2cbdc492861c74e9c <
    29ffd972531f8e6e0edf4ea3496190acff9fc9c2
  - >-
    Linux >= a0d2f20650e81407d8e51ad2cbdc492861c74e9c <
    bf3308416a2be85dcc9965b614a745b40beeff14
  - >-
    Linux >= a0d2f20650e81407d8e51ad2cbdc492861c74e9c <
    fc710f89a644e030a7ca15343176ca862fd61b9d
  - >-
    Linux >= a0d2f20650e81407d8e51ad2cbdc492861c74e9c <
    8d4d06d6e2b501cb8e30ed3b1924c470358e8052
  - >-
    Linux >= a0d2f20650e81407d8e51ad2cbdc492861c74e9c <
    0aaa53936419cf0c19c670387fc6d431e042a1b6
  - >-
    Linux >= a0d2f20650e81407d8e51ad2cbdc492861c74e9c <
    1f77af0aaf277413ff32f6ff8c2c4282bd64c897
  - Linux 4.2
published: '2026-09-11'
updated: '2026-10-19'
sourceUpdated: '2026-10-19T08:46:16.688Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-80992'
references:
  - url: 'https://git.kernel.org/stable/c/29ffd972531f8e6e0edf4ea3496190acff9fc9c2'
  - url: 'https://git.kernel.org/stable/c/bf3308416a2be85dcc9965b614a745b40beeff14'
  - url: 'https://git.kernel.org/stable/c/fc710f89a644e030a7ca15343176ca862fd61b9d'
  - url: 'https://git.kernel.org/stable/c/8d4d06d6e2b501cb8e30ed3b1924c470358e8052'
  - url: 'https://git.kernel.org/stable/c/0aaa53936419cf0c19c670387fc6d431e042a1b6'
  - url: 'https://git.kernel.org/stable/c/1f77af0aaf277413ff32f6ff8c2c4282bd64c897'
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80992.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-80992'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532047'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-80992'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-80992'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-80992.mbox
tags:
  - cve.org
  - csaf
  - vex
  - red-hat
  - score-dispute
epss: 0.00169
epssPercentile: 0.06191
scores:
  cna: 7.8
  vendor: 5.5
ingestedAt: '2026-09-14T15:23:07.454Z'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

net: ravb: avoid dereferencing an invalid PTP clock

The PTP clock is unavailable before the first open, so querying its
index can dereference a NULL pointer. Registration failures can also
leave an error pointer in priv->ptp.clock.

Cache the PHC index separately and report -1 while no clock is
registered. Normalize registration errors to NULL and preserve the
static timestamping capabilities.

## Affected

- `Linux >= a0d2f20650e81407d8e51ad2cbdc492861c74e9c < 29ffd972531f8e6e0edf4ea3496190acff9fc9c2`
- `Linux >= a0d2f20650e81407d8e51ad2cbdc492861c74e9c < bf3308416a2be85dcc9965b614a745b40beeff14`
- `Linux >= a0d2f20650e81407d8e51ad2cbdc492861c74e9c < fc710f89a644e030a7ca15343176ca862fd61b9d`
- `Linux >= a0d2f20650e81407d8e51ad2cbdc492861c74e9c < 8d4d06d6e2b501cb8e30ed3b1924c470358e8052`
- `Linux >= a0d2f20650e81407d8e51ad2cbdc492861c74e9c < 0aaa53936419cf0c19c670387fc6d431e042a1b6`
- `Linux >= a0d2f20650e81407d8e51ad2cbdc492861c74e9c < 1f77af0aaf277413ff32f6ff8c2c4282bd64c897`
- `Linux 4.2`

## Remediation

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

## Vendor advisories

- **Red Hat VEX** · Moderate · updated 2026-09-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80992.json)