---
id: CVE-2026-97618
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  io_uring/net: don't overconsume buffers when using MSG_TRUNC

  When a recv/recvmsg is issued with MSG_TRUNC and the incoming packet is
  larger than the provided buffer, t…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  io_uring/net: don't overconsume buffers when using MSG_TRUNC

  When a recv/recvmsg is issued with MSG_TRUNC and the incoming packet is
  larger than the provided buffer, t…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= ae98dbf43d755b4e111fcd086e53939bef3e9a1a <
    927d96f91c582b319d104ecf50ec935a8dc29193
  - >-
    Linux >= ae98dbf43d755b4e111fcd086e53939bef3e9a1a <
    2e70ea75c7bb38a6dc212975f887310f14f7c043
  - >-
    Linux >= ae98dbf43d755b4e111fcd086e53939bef3e9a1a <
    6028b543884f8735e057ec9eea4908cd61cab230
  - Linux 6.12
published: '2026-09-25'
updated: '2026-09-25'
sourceUpdated: '2026-09-25T11:17:16.000'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-97618'
references:
  - url: 'https://git.kernel.org/stable/c/2e70ea75c7bb38a6dc212975f887310f14f7c043'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/6028b543884f8735e057ec9eea4908cd61cab230'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/927d96f91c582b319d104ecf50ec935a8dc29193'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-25T11:06:38.898Z'
---

## Overview

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

io_uring/net: don't overconsume buffers when using MSG_TRUNC

When a recv/recvmsg is issued with MSG_TRUNC and the incoming packet is
larger than the provided buffer, the net layer returns the full length
of the packet rather than the number of bytes actually copied into the
buffer.  As a result, io_uring advances more of the provided buffer ring
than was actually filled.  Use the actual filled region size to consume
the buffer, but still return the full size to preserve MSG_TRUNC
semantics.

Take care with multishot, because that seems to already truncate the
consumption based on the available payload size.

This was reported in https://github.com/axboe/liburing/issues/1619.

[axboe: fold in size_t unsigned fix]

## Remediation

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