---
id: CVE-2026-43093
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  xsk: tighten UMEM headroom validation to account for tailroom and min frame

  The current headroom validation in xdp_umem_reg() could leave us with
  insufficient space de…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  xsk: tighten UMEM headroom validation to account for tailroom and min frame

  The current headroom validation in xdp_umem_reg() could leave us with
  insufficient space de…
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'
vendor: linux
product: linux_kernel
affected:
  - 'linux_kernel >= 4.19.118, < 4.20'
  - 'linux_kernel >= 5.4.35, < 5.5'
  - 'linux_kernel >= 5.6.7, < 5.7'
  - 'linux_kernel >= 5.7.1, < 6.6.136'
  - 'linux_kernel >= 6.7, < 6.12.83'
  - 'linux_kernel >= 6.13, < 6.18.24'
  - 'linux_kernel >= 6.19, < 6.19.14'
  - linux_kernel = 5.7
  - linux_kernel = 7.0
patched:
  - linux_kernel 6.19.14
published: '2026-05-06'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T02:19:30.533'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-43093'
references:
  - url: 'https://git.kernel.org/stable/c/0ec4d3f6e6934deb843b561ae048cd17218e5ad1'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/1a6051cd7e3e4c54ff3854a43b638b9292af5e67'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/5f123bc278bf4e3283d8606321bebbfd299f4384'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/6523bc1b40e69301f24c14338b762af4739d6d39'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/8769708add9eadeea8041a9761771bb715a87104'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/9ea6ba4f3195dcba6e8b3e7b2e748593b7cafb12'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/a03975beb9f6af0d8ac051e30b2abeabe618414f'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/a315e022a72d95ef5f1d4e58e903cb492b0ad931'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-784472.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
tags:
  - nvd
  - cve.org
epss: 0.00176
epssPercentile: 0.06633
ingestedAt: '2026-10-15T03:30:12.871Z'
---

## Overview

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

xsk: tighten UMEM headroom validation to account for tailroom and min frame

The current headroom validation in xdp_umem_reg() could leave us with
insufficient space dedicated to even receive minimum-sized ethernet
frame. Furthermore if multi-buffer would come to play then
skb_shared_info stored at the end of XSK frame would be corrupted.

HW typically works with 128-aligned sizes so let us provide this value
as bare minimum.

Multi-buffer setting is known later in the configuration process so
besides accounting for 128 bytes, let us also take care of tailroom space
upfront.

## Affected

- `linux_kernel >= 4.19.118, < 4.20`
- `linux_kernel >= 5.4.35, < 5.5`
- `linux_kernel >= 5.6.7, < 5.7`
- `linux_kernel >= 5.7.1, < 6.6.136`
- `linux_kernel >= 6.7, < 6.12.83`
- `linux_kernel >= 6.13, < 6.18.24`
- `linux_kernel >= 6.19, < 6.19.14`
- `linux_kernel = 5.7`
- `linux_kernel = 7.0`

## Remediation

Upgrade past the affected range:

- `linux_kernel 6.19.14`