Attacker Value
Unknown
(0 users assessed)
Exploitability
Unknown
(0 users assessed)
User Interaction
None
Privileges Required
Low
Attack Vector
Local
0

CVE-2023-52439

Disclosure Date: February 20, 2024
Add MITRE ATT&CK tactics and techniques that apply to this CVE.

Description

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

uio: Fix use-after-free in uio_open

core-1 core-2

uio_unregister_device uio_open

			idev = idr_find()

device_unregister(&idev->dev)
put_device(&idev->dev)
uio_device_release

			get_device(&idev->dev)

kfree(idev)
uio_free_minor(minor)

			uio_release
			put_device(&idev->dev)
			kfree(idev)

In the core-1 uio_unregister_device(), the device_unregister will kfree
idev when the idev->dev kobject ref is 1. But after core-1
device_unregister, put_device and before doing kfree, the core-2 may
get_device. Then:

  1. After core-1 kfree idev, the core-2 will do use-after-free for idev.
  2. When core-2 do uio_release and put_device, the idev will be double
    freed.

To address this issue, we can get idev atomic & inc idev reference with
minor_lock.

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CVSS V3 Severity and Metrics
Base Score:
7.8 High
Impact Score:
5.9
Exploitability Score:
1.8
Vector:
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector (AV):
Local
Attack Complexity (AC):
Low
Privileges Required (PR):
Low
User Interaction (UI):
None
Scope (S):
Unchanged
Confidentiality (C):
High
Integrity (I):
High
Availability (A):
High

General Information

Vendors

  • linux

Products

  • linux kernel,
  • linux kernel 4.18
Technical Analysis