---
id: CVE-2026-23122
title: 'igc: Reduce TSN TX packet buffer from 7KB to 5KB per queue'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  igc: Reduce TSN TX packet buffer from 7KB to 5KB per queue

  The previous 7 KB per queue caused TX unit hangs under heavy
  timestamping load. Reducing to 5 KB avoids thes…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 0d58cdc902dace2298406b3972def04f55e3d775 <
    88037973c8ef6032bf84e9955595f8b20bc14c21
  - >-
    Linux >= 0d58cdc902dace2298406b3972def04f55e3d775 <
    8ad1b6c1e63d25f5465b7a8aa403bdcee84b86f9
  - Linux 6.16
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-05T21:19:59.639985Z'
published: '2026-02-14'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T21:23:18.093Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-23122'
references:
  - url: 'https://git.kernel.org/stable/c/88037973c8ef6032bf84e9955595f8b20bc14c21'
  - url: 'https://git.kernel.org/stable/c/8ad1b6c1e63d25f5465b7a8aa403bdcee84b86f9'
tags:
  - cve.org
epss: 0.00117
epssPercentile: 0.01683
ingestedAt: '2026-11-05T22:38:32.075Z'
---

## Overview

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

igc: Reduce TSN TX packet buffer from 7KB to 5KB per queue

The previous 7 KB per queue caused TX unit hangs under heavy
timestamping load. Reducing to 5 KB avoids these hangs and matches
the TSN recommendation in I225/I226 SW User Manual Section 7.5.4.

The 8 KB "freed" by this change is currently unused. This reduction
is not expected to impact throughput, as the i226 is PCIe-limited
for small TSN packets rather than TX-buffer-limited.

## Affected

- `Linux >= 0d58cdc902dace2298406b3972def04f55e3d775 < 88037973c8ef6032bf84e9955595f8b20bc14c21`
- `Linux >= 0d58cdc902dace2298406b3972def04f55e3d775 < 8ad1b6c1e63d25f5465b7a8aa403bdcee84b86f9`
- `Linux 6.16`

## Remediation

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