CVE-2022-3176

2022-09-1600:00:00

ubuntu.com

linux kernel

use-after-free

io_uring

vulnerability

waitqueue

signalfd_poll

binder_poll

upgrade

commit fc78b2fc21f10c4c9c4d5d659a685710ffa63659

CVSS3

7.8

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS

Percentile

14.2%

JSON

There exists a use-after-free in io_uring in the Linux kernel.
Signalfd_poll() and binder_poll() use a waitqueue whose lifetime is the
current task. It will send a POLLFREE notification to all waiters before
the queue is freed. Unfortunately, the io_uring poll doesn’t handle
POLLFREE. This allows a use-after-free to occur if a signalfd or binder fd
is polled with io_uring poll, and the waitqueue gets freed. We recommend
upgrading past commit fc78b2fc21f10c4c9c4d5d659a685710ffa63659

OSVersionArchitecturePackageVersionFilename
ubuntu20.04noarchlinux< 5.4.0-128.144UNKNOWN
ubuntu22.04noarchlinux< 5.15.0-50.56UNKNOWN
ubuntu20.04noarchlinux-aws< 5.4.0-1086.93UNKNOWN
ubuntu22.04noarchlinux-aws< 5.15.0-1021.25UNKNOWN
ubuntu20.04noarchlinux-aws-5.15< 5.15.0-1021.25~20.04.1UNKNOWN
ubuntu18.04noarchlinux-aws-5.4< 5.4.0-1086.93~18.04.1UNKNOWN
ubuntu20.04noarchlinux-azure< 5.4.0-1094.100UNKNOWN
ubuntu22.04noarchlinux-azure< 5.15.0-1021.26UNKNOWN
ubuntu20.04noarchlinux-azure-5.15< 5.15.0-1021.26~20.04.1UNKNOWN
ubuntu18.04noarchlinux-azure-5.4< 5.4.0-1094.100~18.04.1UNKNOWN

OS	Version	Architecture	Package	Version	Filename
ubuntu	20.04	noarch	linux	< 5.4.0-128.144	UNKNOWN
ubuntu	22.04	noarch	linux	< 5.15.0-50.56	UNKNOWN
ubuntu	20.04	noarch	linux-aws	< 5.4.0-1086.93	UNKNOWN
ubuntu	22.04	noarch	linux-aws	< 5.15.0-1021.25	UNKNOWN
ubuntu	20.04	noarch	linux-aws-5.15	< 5.15.0-1021.25~20.04.1	UNKNOWN
ubuntu	18.04	noarch	linux-aws-5.4	< 5.4.0-1086.93~18.04.1	UNKNOWN
ubuntu	20.04	noarch	linux-azure	< 5.4.0-1094.100	UNKNOWN
ubuntu	22.04	noarch	linux-azure	< 5.15.0-1021.26	UNKNOWN
ubuntu	20.04	noarch	linux-azure-5.15	< 5.15.0-1021.26~20.04.1	UNKNOWN
ubuntu	18.04	noarch	linux-azure-5.4	< 5.4.0-1094.100~18.04.1	UNKNOWN