---
id: CVE-2022-50295
title: 'io_uring/msg_ring: Fix NULL pointer dereference in io_msg_send_fd()'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  io_uring/msg_ring: Fix NULL pointer dereference in io_msg_send_fd()

  Syzkaller produced the below call trace:

   BUG: KASAN: null-ptr-deref in io_msg_ring+0x3cb/0x9f0
   W…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= e6130eba8a848a7a6ba6c534bd8f6d60749ae1a9 <
    0163e04ea64cc3dfaa12390286e5f2f481c3b2e3
  - >-
    Linux >= e6130eba8a848a7a6ba6c534bd8f6d60749ae1a9 <
    16bbdfe5fb0e78e0acb13e45fc127e9a296913f2
  - Linux 6.0
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-05T20:09:08.461946Z'
published: '2025-09-15'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T20:10:33.477Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2022-50295'
references:
  - url: 'https://git.kernel.org/stable/c/0163e04ea64cc3dfaa12390286e5f2f481c3b2e3'
  - url: 'https://git.kernel.org/stable/c/16bbdfe5fb0e78e0acb13e45fc127e9a296913f2'
tags:
  - cve.org
epss: 0.0014
epssPercentile: 0.03367
ingestedAt: '2026-11-05T22:38:31.721Z'
---

## Overview

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

io_uring/msg_ring: Fix NULL pointer dereference in io_msg_send_fd()

Syzkaller produced the below call trace:

 BUG: KASAN: null-ptr-deref in io_msg_ring+0x3cb/0x9f0
 Write of size 8 at addr 0000000000000070 by task repro/16399

 CPU: 0 PID: 16399 Comm: repro Not tainted 6.1.0-rc1 #28
 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.11.0-2.el7
 Call Trace:
  <TASK>
  dump_stack_lvl+0xcd/0x134
  ? io_msg_ring+0x3cb/0x9f0
  kasan_report+0xbc/0xf0
  ? io_msg_ring+0x3cb/0x9f0
  kasan_check_range+0x140/0x190
  io_msg_ring+0x3cb/0x9f0
  ? io_msg_ring_prep+0x300/0x300
  io_issue_sqe+0x698/0xca0
  io_submit_sqes+0x92f/0x1c30
  __do_sys_io_uring_enter+0xae4/0x24b0
....
 RIP: 0033:0x7f2eaf8f8289
 RSP: 002b:00007fff40939718 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa
 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f2eaf8f8289
 RDX: 0000000000000000 RSI: 0000000000006f71 RDI: 0000000000000004
 RBP: 00007fff409397a0 R08: 0000000000000000 R09: 0000000000000039
 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004006d0
 R13: 00007fff40939880 R14: 0000000000000000 R15: 0000000000000000
  </TASK>
 Kernel panic - not syncing: panic_on_warn set ...

We don't have a NULL check on file_ptr in io_msg_send_fd() function,
so when file_ptr is NUL src_file is also NULL and get_file()
dereferences a NULL pointer and leads to above crash.

Add a NULL check to fix this issue.

## Affected

- `Linux >= e6130eba8a848a7a6ba6c534bd8f6d60749ae1a9 < 0163e04ea64cc3dfaa12390286e5f2f481c3b2e3`
- `Linux >= e6130eba8a848a7a6ba6c534bd8f6d60749ae1a9 < 16bbdfe5fb0e78e0acb13e45fc127e9a296913f2`
- `Linux 6.0`

## Remediation

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