Bug 2265271 (CVE-2023-52439) - CVE-2023-52439 kernel: uio: Fix use-after-free in uio_open
Summary: CVE-2023-52439 kernel: uio: Fix use-after-free in uio_open
Keywords:
Status: NEW
Alias: CVE-2023-52439
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2265272
Blocks: 2265182
TreeView+ depends on / blocked
 
Reported: 2024-02-21 08:50 UTC by Avinash Hanwate
Modified: 2024-10-21 09:44 UTC (History)
50 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
A flaw was found in the Linux kernel’s uio subsystem. A use-after-free memory flaw in the uio_open functionality allows a local user to crash or escalate their privileges on the system.
Clone Of:
Environment:
Last Closed:
Embargoed:


Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2024:3622 0 None None None 2024-06-05 09:02:18 UTC
Red Hat Product Errata RHBA-2024:3773 0 None None None 2024-06-10 15:10:46 UTC
Red Hat Product Errata RHBA-2024:3990 0 None None None 2024-06-20 01:13:26 UTC
Red Hat Product Errata RHBA-2024:7235 0 None None None 2024-09-26 14:26:45 UTC
Red Hat Product Errata RHSA-2024:3618 0 None None None 2024-06-05 00:30:03 UTC
Red Hat Product Errata RHSA-2024:3627 0 None None None 2024-06-05 10:01:08 UTC
Red Hat Product Errata RHSA-2024:4823 0 None None None 2024-07-24 13:11:04 UTC
Red Hat Product Errata RHSA-2024:4831 0 None None None 2024-07-24 13:23:09 UTC
Red Hat Product Errata RHSA-2024:5281 0 None None None 2024-08-13 14:32:48 UTC
Red Hat Product Errata RHSA-2024:6993 0 None None None 2024-09-24 01:10:45 UTC
Red Hat Product Errata RHSA-2024:6997 0 None None None 2024-09-24 02:49:28 UTC

Description Avinash Hanwate 2024-02-21 08:50:26 UTC
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.

https://git.kernel.org/stable/c/0c9ae0b8605078eafc3bea053cc78791e97ba2e2
https://git.kernel.org/stable/c/17a8519cb359c3b483fb5c7367efa9a8a508bdea
https://git.kernel.org/stable/c/3174e0f7de1ba392dc191625da83df02d695b60c
https://git.kernel.org/stable/c/35f102607054faafe78d2a6994b18d5d9d6e92ad
https://git.kernel.org/stable/c/5cf604ee538ed0c467abe3b4cda5308a6398f0f7
https://git.kernel.org/stable/c/5e0be1229ae199ebb90b33102f74a0f22d152570
https://git.kernel.org/stable/c/913205930da6213305616ac539447702eaa85e41
https://git.kernel.org/stable/c/e93da893d52d82d57fc0db2ca566024e0f26ff50

Comment 1 Avinash Hanwate 2024-02-21 08:52:21 UTC
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2265272]

Comment 4 Justin M. Forbes 2024-02-21 22:45:05 UTC
This was fixed for Fedora with the 6.6.13 stable kernel update.

Comment 7 errata-xmlrpc 2024-06-05 00:29:58 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2024:3618 https://access.redhat.com/errata/RHSA-2024:3618

Comment 8 errata-xmlrpc 2024-06-05 10:01:04 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2024:3627 https://access.redhat.com/errata/RHSA-2024:3627

Comment 9 Alex 2024-06-09 15:09:30 UTC
The result of automatic check (that is developed by Alexander Larkin) for this CVE-2023-52439 is: CHECK	Maybe valid. Check manually. with impact MODERATE (that is approximation based on flags LOCK DANGER INIT UAF  ; these flags parsed automatically based on patche data). Such automatic check happens only for Low/Moderates (and only when not from reporter, but parsing already existing CVE). Highs always checked manually (I check it myself and then we check it again in Remediation team). In rare cases some of the Moderates could be increased to High later.

Comment 11 errata-xmlrpc 2024-07-24 13:10:58 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Extended Update Support

Via RHSA-2024:4823 https://access.redhat.com/errata/RHSA-2024:4823

Comment 12 errata-xmlrpc 2024-07-24 13:23:05 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Extended Update Support

Via RHSA-2024:4831 https://access.redhat.com/errata/RHSA-2024:4831

Comment 13 errata-xmlrpc 2024-08-13 14:32:44 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-2024:5281 https://access.redhat.com/errata/RHSA-2024:5281

Comment 16 errata-xmlrpc 2024-09-24 01:10:41 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.8 Extended Update Support

Via RHSA-2024:6993 https://access.redhat.com/errata/RHSA-2024:6993

Comment 17 errata-xmlrpc 2024-09-24 02:49:23 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2024:6997 https://access.redhat.com/errata/RHSA-2024:6997


Note You need to log in before you can comment on or make changes to this bug.