---
id: CVE-2026-74559
title: 'xsk: drain continuation descs after overflow in xsk_build_skb()'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  xsk: drain continuation descs after overflow in xsk_build_skb()

  Fix generic xmit path multi-buffer logic when packets are either too big
  (count of descriptors exceed M…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= cf24f5a5feeaae34c1a34d1e04f8ac697290427a <
    ecd0d1cde0478c232a867f14ec99cf97aff5eb30
  - >-
    Linux >= cf24f5a5feeaae34c1a34d1e04f8ac697290427a <
    ceb00cb87a22c42d20c39336213db2b843ca9e34
  - >-
    Linux >= cf24f5a5feeaae34c1a34d1e04f8ac697290427a <
    5e94d74e4f3baebaa083288f33b4be7ce0a34982
  - >-
    Linux >= cf24f5a5feeaae34c1a34d1e04f8ac697290427a <
    bd44a6dcd4248883de90f5dad53ae80066e27096
  - Linux 6.6
published: '2026-08-15'
updated: '2026-10-21'
sourceUpdated: '2026-10-21T12:45:57.288Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-74559'
references:
  - url: 'https://git.kernel.org/stable/c/ecd0d1cde0478c232a867f14ec99cf97aff5eb30'
  - url: 'https://git.kernel.org/stable/c/ceb00cb87a22c42d20c39336213db2b843ca9e34'
  - url: 'https://git.kernel.org/stable/c/5e94d74e4f3baebaa083288f33b4be7ce0a34982'
  - url: 'https://git.kernel.org/stable/c/bd44a6dcd4248883de90f5dad53ae80066e27096'
tags:
  - cve.org
epss: 0.00206
epssPercentile: 0.10136
ingestedAt: '2026-10-21T12:48:53.578Z'
---

## Overview

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

xsk: drain continuation descs after overflow in xsk_build_skb()

Fix generic xmit path multi-buffer logic when packets are either too big
(count of descriptors exceed MAX_SKB_FRAGS) or an invalid descriptor is
included in fragmented packet. Introduce xdp_sock::drain_cont and act
upon this flag - when it is set, keep on consuming descriptors from
AF_XDP Tx ring and put them directly onto Cq. Previously these
descriptors were silently lost and could never be reached again.

## Affected

- `Linux >= cf24f5a5feeaae34c1a34d1e04f8ac697290427a < ecd0d1cde0478c232a867f14ec99cf97aff5eb30`
- `Linux >= cf24f5a5feeaae34c1a34d1e04f8ac697290427a < ceb00cb87a22c42d20c39336213db2b843ca9e34`
- `Linux >= cf24f5a5feeaae34c1a34d1e04f8ac697290427a < 5e94d74e4f3baebaa083288f33b4be7ce0a34982`
- `Linux >= cf24f5a5feeaae34c1a34d1e04f8ac697290427a < bd44a6dcd4248883de90f5dad53ae80066e27096`
- `Linux 6.6`

## Remediation

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