---
id: CVE-2026-74708
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  xsk: validate launch-time metadata size

  Launch-time metadata extends beyond the first 16 bytes of struct
  xsk_tx_metadata
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  xsk: validate launch-time metadata size

  Launch-time metadata extends beyond the first 16 bytes of struct
  xsk_tx_metadata. Reject the request when the registered metada…
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
affected:
  - >-
    Linux >= ca4419f15abd19ba8be1e109661b60f9f5b6c9f0 <
    af511afa1d2977f384044df78d6fbf9fba653f7a
  - >-
    Linux >= ca4419f15abd19ba8be1e109661b60f9f5b6c9f0 <
    bc63d47611c07b0d5d655fe1a590861931527920
  - >-
    Linux >= ca4419f15abd19ba8be1e109661b60f9f5b6c9f0 <
    439ce2dddf3d22129b9113a7881637256a35e936
  - Linux d9d736c416c9a85f84e15435ba82a177262e745b
  - Linux >= 6.14.2 < 6.15
  - Linux 6.15
published: '2026-08-22'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T20:17:53.607'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-74708'
references:
  - url: 'https://git.kernel.org/stable/c/439ce2dddf3d22129b9113a7881637256a35e936'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/af511afa1d2977f384044df78d6fbf9fba653f7a'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/bc63d47611c07b0d5d655fe1a590861931527920'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
epss: 0.00173
epssPercentile: 0.06731
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-16T19:15:12.386738Z'
ingestedAt: '2026-10-14T13:30:58.544Z'
---

## Overview

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

xsk: validate launch-time metadata size

Launch-time metadata extends beyond the first 16 bytes of struct
xsk_tx_metadata. Reject the request when the registered metadata area does
not contain the complete field.

Snapshot the validated flags for the generic transmit path and use that
snapshot for request and completion processing, avoiding inconsistent
decisions if user space changes the flags concurrently.

Note that only xsk_skb_metadata is properly using the flags,
__xsk_buff_get_metadata ignores them. Next commits address that.

## Remediation

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