CVE-2022-49788

misc/vmw_vmci: fix an infoleak in vmci_host_do_receive_datagram()

State: Published
Severity: Not scored
Published: May 1, 2025
Updated: May 11, 2026
Reserved: May 1, 2025

Description

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	06164d2b72aa752ce4633184b3e0d97601017135 to before 7ccf7229b96fadc3a185d1391f814a604c7ef609Affected 06164d2b72aa752ce4633184b3e0d97601017135 to before f04586c2315cfd03d72ad0395705435e7ed07b1aAffected 06164d2b72aa752ce4633184b3e0d97601017135 to before 5a275528025ae4bc7e2232866856dfebf84b2fadAffected 06164d2b72aa752ce4633184b3e0d97601017135 to before e7061dd1fef2dfb6458cd521aef27aa66f510d31Affected 06164d2b72aa752ce4633184b3e0d97601017135 to before 62634b43d3c4e1bf62fd540196f7081bf0885c0aAffected 06164d2b72aa752ce4633184b3e0d97601017135 to before 8e2f33c598370bcf828bab4d667d1d38bcd3c57dAffected 06164d2b72aa752ce4633184b3e0d97601017135 to before 76c50d77b928a33e5290aaa9fdc10e88254ff8c7Affected 06164d2b72aa752ce4633184b3e0d97601017135 to before e5b0d06d9b10f5f43101bd6598b076c347f9295fAffected
LinuxLinux	3.9Affected before 3.9Not affected 4.9.334 through 4.9.Not affected 4.14.300 through 4.14.Not affected 4.19.267 through 4.19.Not affected 5.4.225 through 5.4.Not affected 5.10.156 through 5.10.Not affected 5.15.80 through 5.15.Not affected 6.0.10 through 6.0.*Not affected 6.1 and laterNot affected

Product

Versions

LinuxLinux

06164d2b72aa752ce4633184b3e0d97601017135 to before 7ccf7229b96fadc3a185d1391f814a604c7ef609Affected
06164d2b72aa752ce4633184b3e0d97601017135 to before f04586c2315cfd03d72ad0395705435e7ed07b1aAffected
06164d2b72aa752ce4633184b3e0d97601017135 to before 5a275528025ae4bc7e2232866856dfebf84b2fadAffected
06164d2b72aa752ce4633184b3e0d97601017135 to before e7061dd1fef2dfb6458cd521aef27aa66f510d31Affected
06164d2b72aa752ce4633184b3e0d97601017135 to before 62634b43d3c4e1bf62fd540196f7081bf0885c0aAffected
06164d2b72aa752ce4633184b3e0d97601017135 to before 8e2f33c598370bcf828bab4d667d1d38bcd3c57dAffected
06164d2b72aa752ce4633184b3e0d97601017135 to before 76c50d77b928a33e5290aaa9fdc10e88254ff8c7Affected
06164d2b72aa752ce4633184b3e0d97601017135 to before e5b0d06d9b10f5f43101bd6598b076c347f9295fAffected

LinuxLinux

3.9Affected
before 3.9Not affected
4.9.334 through 4.9.*Not affected
4.14.300 through 4.14.*Not affected
4.19.267 through 4.19.*Not affected
5.4.225 through 5.4.*Not affected
5.10.156 through 5.10.*Not affected
5.15.80 through 5.15.*Not affected
6.0.10 through 6.0.*Not affected
6.1 and laterNot affected

References

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.