---
id: CVE-2022-49788
title: 'misc/vmw_vmci: fix an infoleak in vmci_host_do_receive_datagram()'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  misc/vmw_vmci: fix an infoleak in vmci_host_do_receive_datagram()

  `struct vmci_event_qp` allocated by qp_notify_peer() contains padding,
  which may carry uninitialized …
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 06164d2b72aa752ce4633184b3e0d97601017135 <
    7ccf7229b96fadc3a185d1391f814a604c7ef609
  - >-
    Linux >= 06164d2b72aa752ce4633184b3e0d97601017135 <
    f04586c2315cfd03d72ad0395705435e7ed07b1a
  - >-
    Linux >= 06164d2b72aa752ce4633184b3e0d97601017135 <
    5a275528025ae4bc7e2232866856dfebf84b2fad
  - >-
    Linux >= 06164d2b72aa752ce4633184b3e0d97601017135 <
    e7061dd1fef2dfb6458cd521aef27aa66f510d31
  - >-
    Linux >= 06164d2b72aa752ce4633184b3e0d97601017135 <
    62634b43d3c4e1bf62fd540196f7081bf0885c0a
  - >-
    Linux >= 06164d2b72aa752ce4633184b3e0d97601017135 <
    8e2f33c598370bcf828bab4d667d1d38bcd3c57d
  - >-
    Linux >= 06164d2b72aa752ce4633184b3e0d97601017135 <
    76c50d77b928a33e5290aaa9fdc10e88254ff8c7
  - >-
    Linux >= 06164d2b72aa752ce4633184b3e0d97601017135 <
    e5b0d06d9b10f5f43101bd6598b076c347f9295f
  - Linux 3.9
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-05T19:48:00.593549Z'
published: '2025-05-01'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T19:49:48.761Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2022-49788'
references:
  - url: 'https://git.kernel.org/stable/c/7ccf7229b96fadc3a185d1391f814a604c7ef609'
  - url: 'https://git.kernel.org/stable/c/f04586c2315cfd03d72ad0395705435e7ed07b1a'
  - url: 'https://git.kernel.org/stable/c/5a275528025ae4bc7e2232866856dfebf84b2fad'
  - url: 'https://git.kernel.org/stable/c/e7061dd1fef2dfb6458cd521aef27aa66f510d31'
  - url: 'https://git.kernel.org/stable/c/62634b43d3c4e1bf62fd540196f7081bf0885c0a'
  - url: 'https://git.kernel.org/stable/c/8e2f33c598370bcf828bab4d667d1d38bcd3c57d'
  - url: 'https://git.kernel.org/stable/c/76c50d77b928a33e5290aaa9fdc10e88254ff8c7'
  - url: 'https://git.kernel.org/stable/c/e5b0d06d9b10f5f43101bd6598b076c347f9295f'
tags:
  - cve.org
epss: 0.00234
epssPercentile: 0.14382
ingestedAt: '2026-11-05T22:38:31.594Z'
---

## Overview

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

misc/vmw_vmci: fix an infoleak in vmci_host_do_receive_datagram()

`struct vmci_event_qp` allocated by qp_notify_peer() contains padding,
which may carry uninitialized data to the userspace, as observed by
KMSAN:

  BUG: KMSAN: kernel-infoleak in instrument_copy_to_user ./include/linux/instrumented.h:121
   instrument_copy_to_user ./include/linux/instrumented.h:121
   _copy_to_user+0x5f/0xb0 lib/usercopy.c:33
   copy_to_user ./include/linux/uaccess.h:169
   vmci_host_do_receive_datagram drivers/misc/vmw_vmci/vmci_host.c:431
   vmci_host_unlocked_ioctl+0x33d/0x43d0 drivers/misc/vmw_vmci/vmci_host.c:925
   vfs_ioctl fs/ioctl.c:51
  ...

  Uninit was stored to memory at:
   kmemdup+0x74/0xb0 mm/util.c:131
   dg_dispatch_as_host drivers/misc/vmw_vmci/vmci_datagram.c:271
   vmci_datagram_dispatch+0x4f8/0xfc0 drivers/misc/vmw_vmci/vmci_datagram.c:339
   qp_notify_peer+0x19a/0x290 drivers/misc/vmw_vmci/vmci_queue_pair.c:1479
   qp_broker_attach drivers/misc/vmw_vmci/vmci_queue_pair.c:1662
   qp_broker_alloc+0x2977/0x2f30 drivers/misc/vmw_vmci/vmci_queue_pair.c:1750
   vmci_qp_broker_alloc+0x96/0xd0 drivers/misc/vmw_vmci/vmci_queue_pair.c:1940
   vmci_host_do_alloc_queuepair drivers/misc/vmw_vmci/vmci_host.c:488
   vmci_host_unlocked_ioctl+0x24fd/0x43d0 drivers/misc/vmw_vmci/vmci_host.c:927
  ...

  Local variable ev created at:
   qp_notify_peer+0x54/0x290 drivers/misc/vmw_vmci/vmci_queue_pair.c:1456
   qp_broker_attach drivers/misc/vmw_vmci/vmci_queue_pair.c:1662
   qp_broker_alloc+0x2977/0x2f30 drivers/misc/vmw_vmci/vmci_queue_pair.c:1750

  Bytes 28-31 of 48 are uninitialized
  Memory access of size 48 starts at ffff888035155e00
  Data copied to user address 0000000020000100

Use memset() to prevent the infoleaks.

Also speculatively fix qp_notify_peer_local(), which may suffer from the
same problem.

## Affected

- `Linux >= 06164d2b72aa752ce4633184b3e0d97601017135 < 7ccf7229b96fadc3a185d1391f814a604c7ef609`
- `Linux >= 06164d2b72aa752ce4633184b3e0d97601017135 < f04586c2315cfd03d72ad0395705435e7ed07b1a`
- `Linux >= 06164d2b72aa752ce4633184b3e0d97601017135 < 5a275528025ae4bc7e2232866856dfebf84b2fad`
- `Linux >= 06164d2b72aa752ce4633184b3e0d97601017135 < e7061dd1fef2dfb6458cd521aef27aa66f510d31`
- `Linux >= 06164d2b72aa752ce4633184b3e0d97601017135 < 62634b43d3c4e1bf62fd540196f7081bf0885c0a`
- `Linux >= 06164d2b72aa752ce4633184b3e0d97601017135 < 8e2f33c598370bcf828bab4d667d1d38bcd3c57d`
- `Linux >= 06164d2b72aa752ce4633184b3e0d97601017135 < 76c50d77b928a33e5290aaa9fdc10e88254ff8c7`
- `Linux >= 06164d2b72aa752ce4633184b3e0d97601017135 < e5b0d06d9b10f5f43101bd6598b076c347f9295f`
- `Linux 3.9`

## Remediation

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