Bug 2363378 (CVE-2022-49788)

Summary:	CVE-2022-49788 kernel: misc/vmw_vmci: fix an infoleak in vmci_host_do_receive_datagram()
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	dfreiber, drow, jburrell, vkumar
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
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Regression:	---	Mount Type:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2025-05-01 15:02:23 UTC

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.

Comment 1 Avinash Hanwate 2025-05-02 04:44:48 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025050121-CVE-2022-49788-6e84@gregkh/T

Comment 5 errata-xmlrpc 2025-07-16 05:45:25 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2025:11299 https://access.redhat.com/errata/RHSA-2025:11299

Comment 6 errata-xmlrpc 2025-07-16 05:58:00 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2025:11298 https://access.redhat.com/errata/RHSA-2025:11298

Comment 10 errata-xmlrpc 2025-08-04 16:18:34 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2025:12746 https://access.redhat.com/errata/RHSA-2025:12746

Comment 11 errata-xmlrpc 2025-08-05 15:48:26 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions

Via RHSA-2025:13029 https://access.redhat.com/errata/RHSA-2025:13029

Comment 12 errata-xmlrpc 2025-08-05 15:55:26 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions

Via RHSA-2025:13030 https://access.redhat.com/errata/RHSA-2025:13030

Comment 13 errata-xmlrpc 2025-08-05 17:57:50 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.8 Telecommunications Update Service

Via RHSA-2025:13061 https://access.redhat.com/errata/RHSA-2025:13061

Comment 14 errata-xmlrpc 2025-08-06 05:16:14 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On

Via RHSA-2025:13120 https://access.redhat.com/errata/RHSA-2025:13120

Comment 15 errata-xmlrpc 2025-08-06 07:51:32 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Extended Update Support

Via RHSA-2025:13135 https://access.redhat.com/errata/RHSA-2025:13135

Comment 16 errata-xmlrpc 2025-08-11 14:17:53 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2025:13633 https://access.redhat.com/errata/RHSA-2025:13633

Comment 17 errata-xmlrpc 2025-08-13 02:41:34 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.6 Telecommunications Update Service

Via RHSA-2025:13776 https://access.redhat.com/errata/RHSA-2025:13776

Comment 18 errata-xmlrpc 2025-08-13 09:36:29 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2025:13781 https://access.redhat.com/errata/RHSA-2025:13781

Comment 19 errata-xmlrpc 2025-08-20 08:08:33 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.2 Advanced Update Support

Via RHSA-2025:14136 https://access.redhat.com/errata/RHSA-2025:14136

Comment 20 errata-xmlrpc 2025-08-27 11:40:46 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7 Extended Lifecycle Support

Via RHSA-2025:14746 https://access.redhat.com/errata/RHSA-2025:14746

Comment 21 errata-xmlrpc 2025-08-27 12:39:47 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7 Extended Lifecycle Support

Via RHSA-2025:14748 https://access.redhat.com/errata/RHSA-2025:14748