---
id: CVE-2026-90063
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  virtio-net: Ensure that TCP packets don't overflow gso_segs

  The user can specify any gso_size in a packet crafted with an AF_PACKET
  PACKET_VNET_HDR socket, even smalle…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  virtio-net: Ensure that TCP packets don't overflow gso_segs

  The user can specify any gso_size in a packet crafted with an AF_PACKET
  PACKET_VNET_HDR socket, even smalle…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 7c6d2ecbda83150b2036a2b36b21381ad4667762 <
    d3d111fe809773edbb4ae121e36253b7d683509a
  - >-
    Linux >= 7c6d2ecbda83150b2036a2b36b21381ad4667762 <
    8f6667a081887c2b59c6f3dd86c1789ada563762
  - >-
    Linux >= 7c6d2ecbda83150b2036a2b36b21381ad4667762 <
    339f47ae04dcc6b5a730dd6bc70dddc8937c3260
  - >-
    Linux >= 7c6d2ecbda83150b2036a2b36b21381ad4667762 <
    29bd12c7c5f9d6cf855b87bace18f71e9607f9e8
  - >-
    Linux >= 7c6d2ecbda83150b2036a2b36b21381ad4667762 <
    0e5ed3b98d1d8d251acfdccfeaa607453ad12954
  - >-
    Linux >= 7c6d2ecbda83150b2036a2b36b21381ad4667762 <
    75c271c48f483af678e514734e10b2452410e08c
  - >-
    Linux >= 7c6d2ecbda83150b2036a2b36b21381ad4667762 <
    c27c449d455aafd9018a3cbab150f1c42c87923f
  - Linux bfbaf151efe491e30697e21c8b7ae1b615480873
  - Linux 6c83456601e65a6dd371ddf595510183d198e9b1
  - Linux b3ebd9830c6026c98f03f7047c9d608573773f13
  - Linux b96fb681ca789629b8ba3da99ca3b2e6fa807f0a
  - Linux >= 4.14.187 < 4.15
  - Linux >= 4.19.131 < 4.20
  - Linux >= 5.4.46 < 5.5
  - Linux >= 5.6.18 < 5.7
  - Linux 5.7
published: '2026-09-17'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T17:16:55.080'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-90063'
references:
  - url: 'https://git.kernel.org/stable/c/0e5ed3b98d1d8d251acfdccfeaa607453ad12954'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/29bd12c7c5f9d6cf855b87bace18f71e9607f9e8'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/339f47ae04dcc6b5a730dd6bc70dddc8937c3260'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/75c271c48f483af678e514734e10b2452410e08c'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/8f6667a081887c2b59c6f3dd86c1789ada563762'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/c27c449d455aafd9018a3cbab150f1c42c87923f'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d3d111fe809773edbb4ae121e36253b7d683509a'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-17T16:21:47.900Z'
epss: 0.00215
epssPercentile: 0.10472
---

## Overview

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

virtio-net: Ensure that TCP packets don't overflow gso_segs

The user can specify any gso_size in a packet crafted with an AF_PACKET
PACKET_VNET_HDR socket, even smaller than TCP_MIN_GSO_SIZE = 8. At the
same time, GSO_MAX_SIZE = 8 * GSO_MAX_SEGS = 8 * 65535. When the user
crafts a packet with gso_size < 8, there is a risk for partial GSO to
overflow the 16-bit gso_segs field when dividing the SKB length by
gso_size.

Adjust gso_size of TCP packets to be at least TCP_MIN_GSO_SIZE = 8. Keep
gso_size of UDP GSO packets, as gso_size=1 is valid and explicitly
tested at tools/testing/selftests/net/tun.c:649.

## Remediation

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