---
id: CVE-2026-80779
title: 'net/ionic: avoid OOB TX partner lookup for hwstamp RXQ'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  net/ionic: avoid OOB TX partner lookup for hwstamp RXQ

  The dedicated hardware timestamp RX queue is allocated with q->index
  equal to lif->ionic->nrxqs_per_lif. The nor…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 8eeed8373e1cca836799bf8e4a05cffa8e444908 <
    881a805a8029ba48c0ce81c6674910f8d83f7afb
  - >-
    Linux >= 8eeed8373e1cca836799bf8e4a05cffa8e444908 <
    39fc615e355b65b8d43be30da57aa95ae6eaf688
  - >-
    Linux >= 8eeed8373e1cca836799bf8e4a05cffa8e444908 <
    f3868046e8e2e761d4d943a232bd109ff22a7d5b
  - >-
    Linux >= 8eeed8373e1cca836799bf8e4a05cffa8e444908 <
    ea081b4435515ac7177eb598a3c0678d1b9e7911
  - >-
    Linux >= 8eeed8373e1cca836799bf8e4a05cffa8e444908 <
    d92255b405fb6f5acca408239ccd742e0a42c9cb
  - Linux 6.9
published: '2026-09-04'
updated: '2026-10-19'
sourceUpdated: '2026-10-19T08:43:34.624Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-80779'
references:
  - url: 'https://git.kernel.org/stable/c/881a805a8029ba48c0ce81c6674910f8d83f7afb'
  - url: 'https://git.kernel.org/stable/c/39fc615e355b65b8d43be30da57aa95ae6eaf688'
  - url: 'https://git.kernel.org/stable/c/f3868046e8e2e761d4d943a232bd109ff22a7d5b'
  - url: 'https://git.kernel.org/stable/c/ea081b4435515ac7177eb598a3c0678d1b9e7911'
  - url: 'https://git.kernel.org/stable/c/d92255b405fb6f5acca408239ccd742e0a42c9cb'
tags:
  - cve.org
epss: 0.00168
epssPercentile: 0.0567
ingestedAt: '2026-10-19T10:20:54.955Z'
---

## Overview

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

net/ionic: avoid OOB TX partner lookup for hwstamp RXQ

The dedicated hardware timestamp RX queue is allocated with q->index
equal to lif->ionic->nrxqs_per_lif. The normal txqcqs array only
contains the regular queue pairs, so using that index to set rxq->partner
can read one entry past txqcqs[] and then write through the derived
pointer.
Only link RX/TX partners for normal queue-pair indexes. Leave the hwstamp
RX queue unpaired, and make the XDP_TX path abort cleanly if an RX queue
has no TX partner.

## Affected

- `Linux >= 8eeed8373e1cca836799bf8e4a05cffa8e444908 < 881a805a8029ba48c0ce81c6674910f8d83f7afb`
- `Linux >= 8eeed8373e1cca836799bf8e4a05cffa8e444908 < 39fc615e355b65b8d43be30da57aa95ae6eaf688`
- `Linux >= 8eeed8373e1cca836799bf8e4a05cffa8e444908 < f3868046e8e2e761d4d943a232bd109ff22a7d5b`
- `Linux >= 8eeed8373e1cca836799bf8e4a05cffa8e444908 < ea081b4435515ac7177eb598a3c0678d1b9e7911`
- `Linux >= 8eeed8373e1cca836799bf8e4a05cffa8e444908 < d92255b405fb6f5acca408239ccd742e0a42c9cb`
- `Linux 6.9`

## Remediation

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