---
id: CVE-2025-68317
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  io_uring/zctx: check chained notif contexts

  Send zc only links ubuf_info for requests coming from the same context.
  There are some ambiguous syz reports, so let's chec…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  io_uring/zctx: check chained notif contexts

  Send zc only links ubuf_info for requests coming from the same context.
  There are some ambiguous syz reports, so let's chec…
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'
published: '2025-12-16'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T16:10:00.250'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-68317'
references:
  - url: 'https://git.kernel.org/stable/c/aaafd17d3f4be2c15539359a5b4bfa00237f687f'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/ab3ea6eac5f45669b091309f592c4ea324003053'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d664a3ce3a604231a0b144c152a3755d03b18b60'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
epss: 0.00142
epssPercentile: 0.03083
ingestedAt: '2026-10-14T16:40:32.057Z'
---

## Overview

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

io_uring/zctx: check chained notif contexts

Send zc only links ubuf_info for requests coming from the same context.
There are some ambiguous syz reports, so let's check the assumption on
notification completion.

## Remediation

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