Bug 2177759 (CVE-2023-28464)

Summary: CVE-2023-28464 Kernel: double free in hci_conn_cleanup of the bluetooth subsystem
Product: [Other] Security Response Reporter: Rohit Keshri <rkeshri>
Component: vulnerabilityAssignee: Nobody <nobody>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: acaringi, allarkin, bhu, chwhite, crwood, dbohanno, ddepaula, debarbos, dfreiber, dvlasenk, ezulian, fhrbata, hkrzesin, jarod, jburrell, jdenham, jfaracco, jferlan, jforbes, jlelli, joe.lawrence, jshortt, jstancek, jwyatt, kcarcia, kernel-mgr, ldoskova, lgoncalv, lzampier, mcascell, nmurray, ptalbert, qzhao, rogbas, rrobaina, rvrbovsk, rysulliv, scweaver, steve.beattie, tyberry, vkumar, walters, wcosta, williams, wmealing, ycote
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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Doc Text:
A double-free vulnerability was found in the hci_conn_cleanup in net/bluetooth/hci_conn.c in the Linux Kernel. This issue may cause a denial of service or privilege escalation.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 2177777, 2177778, 2177779, 2177780, 2183548    
Bug Blocks: 2282863, 2176489    

Description Rohit Keshri 2023-03-13 14:54:44 UTC 
A double free vulnerability was found in the hci_conn_cleanup function of net/bluetooth/hci_conn.c, which may cause DOS or privilege escalation.

Version: Linux kernel 6.2 (this problem also exists in 6.3-rc1)


At the end of the hci_conn_del_sysfs(conn) function in the hci_conn_cleanup function, hci_dev_put(hdev) will be called. The hci_dev_put function will eventually call kfree to release the space used by name:

```
hci_dev_put
put_device
kobject_put
kref_put
kobject_release
kobject_cleanup
kfree_const
kfree

```



After the hci_conn_del_sysfs function ends, the hci_dev_put function is called again in the hci_conn_cleanup function, and their parameters hdev are the same, so double free will be caused when the name is released.

In addition, at the end of hci_conn_cleanup, the hci_conn_put function is called again, which will call the put_device function to release conn->dev. Obviously conn->dev has been released, so there will also be a double free problem here.



Call Trace from syzbot, https://syzkaller.appspot.com/bug?id=1bb51491ca5df96a5f724899d1dbb87afda61419:
Comment 3 Pedro Sampaio 2023-03-31 15:11:42 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2183548]
Comment 9 Justin M. Forbes 2023-05-09 17:41:12 UTC 
This was fixed for Fedora with the 6.2.12 stable kernel update.
Comment 11 errata-xmlrpc 2024-04-30 10:09:39 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2024:2394 https://access.redhat.com/errata/RHSA-2024:2394
Comment 12 errata-xmlrpc 2024-05-22 09:12:36 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2024:2950 https://access.redhat.com/errata/RHSA-2024:2950
Comment 13 errata-xmlrpc 2024-05-22 09:50:10 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2024:3138 https://access.redhat.com/errata/RHSA-2024:3138
Comment 14 Alex 2024-05-28 09:41:38 UTC 
*** Bug 2282686 has been marked as a duplicate of this bug. ***