---
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'
cwe:
  - CWE-1288
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 6fe4220912d19152a26ce19713ab232f4263018d <
    aaafd17d3f4be2c15539359a5b4bfa00237f687f
  - >-
    Linux >= 6fe4220912d19152a26ce19713ab232f4263018d <
    d664a3ce3a604231a0b144c152a3755d03b18b60
  - >-
    Linux >= 6fe4220912d19152a26ce19713ab232f4263018d <
    ab3ea6eac5f45669b091309f592c4ea324003053
  - Linux 6.10
published: '2025-12-16'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T22:19:12.023'
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
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-68317.json
  - url: 'https://access.redhat.com/security/cve/CVE-2025-68317'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2422805'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2025-68317'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2025-68317'
  - url: >-
      https://lore.kernel.org/linux-cve-announce/2025121656-CVE-2025-68317-28c8@gregkh/T
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
  - score-dispute
epss: 0.00142
epssPercentile: 0.03491
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-15T22:00:54.118508Z'
scores:
  nvd: 7.8
  vendor: 5.5
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.

## Vendor advisories

- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9 · updated 2026-10-16 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-68317.json)