CVE-2023-52445

2024-02-2200:00:00

ubuntu.com

linux kernel

media driver

vulnerability

cve-2023-52445

kthread

pvrusb2

context disconnection

usb hub_event handler

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

AI Score

7.5

Confidence

High

EPSS

Percentile

5.1%

JSON

In the Linux kernel, the following vulnerability has been resolved: media:
pvrusb2: fix use after free on context disconnection Upon module load, a
kthread is created targeting the pvr2_context_thread_func function, which
may call pvr2_context_destroy and thus call kfree() on the context object.
However, that might happen before the usb hub_event handler is able to
notify the driver. This patch adds a sanity check before the invalid read
reported by syzbot, within the context disconnection call stack.

Notes

Author	Note
rodrigo-zaiden	USN-6765-1 for linux-oem-6.5 wrongly stated that this CVE was fixed in version 6.5.0-1022.23. The mentioned notice was revoked and the state of the fix for linux-oem-6.5 was recovered to the previous state.

OSVersionArchitecturePackageVersionFilename
ubuntu18.04noarchlinux< 4.15.0-224.236UNKNOWN
ubuntu20.04noarchlinux< 5.4.0-176.196UNKNOWN
ubuntu22.04noarchlinux< 5.15.0-102.112UNKNOWN
ubuntu23.10noarchlinux< 6.5.0-41.41UNKNOWN
ubuntu16.04noarchlinux< 4.4.0-253.287UNKNOWN
ubuntu18.04noarchlinux-aws< 4.15.0-1167.180UNKNOWN
ubuntu20.04noarchlinux-aws< 5.4.0-1122.132UNKNOWN
ubuntu22.04noarchlinux-aws< 5.15.0-1057.63UNKNOWN
ubuntu23.10noarchlinux-aws< 6.5.0-1021.21UNKNOWN
ubuntu14.04noarchlinux-aws< 4.4.0-1130.136UNKNOWN

OS	Version	Architecture	Package	Version	Filename
ubuntu	18.04	noarch	linux	< 4.15.0-224.236	UNKNOWN
ubuntu	20.04	noarch	linux	< 5.4.0-176.196	UNKNOWN
ubuntu	22.04	noarch	linux	< 5.15.0-102.112	UNKNOWN
ubuntu	23.10	noarch	linux	< 6.5.0-41.41	UNKNOWN
ubuntu	16.04	noarch	linux	< 4.4.0-253.287	UNKNOWN
ubuntu	18.04	noarch	linux-aws	< 4.15.0-1167.180	UNKNOWN
ubuntu	20.04	noarch	linux-aws	< 5.4.0-1122.132	UNKNOWN
ubuntu	22.04	noarch	linux-aws	< 5.15.0-1057.63	UNKNOWN
ubuntu	23.10	noarch	linux-aws	< 6.5.0-1021.21	UNKNOWN
ubuntu	14.04	noarch	linux-aws	< 4.4.0-1130.136	UNKNOWN