Bug 1966578 (CVE-2021-3573)

Summary:	CVE-2021-3573 kernel: use-after-free in function hci_sock_bound_ioctl()
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	acaringi, adscvr, airlied, alciregi, bhu, blc, bmasney, brdeoliv, bskeggs, chwhite, crwood, dhoward, dvlasenk, fhrbata, fpacheco, hdegoede, hkrzesin, jarodwilson, jeremy, jforbes, jlelli, jonathan, josef, jshortt, jstancek, jwboyer, kcarcia, kernel-maint, kernel-mgr, lgoncalv, linville, masami256, mchehab, mlangsdo, nmurray, ptalbert, qzhao, rvrbovsk, security-response-team, steved, walters, wcosta, williams, yozone
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	kernel 5.13-rc5	Doc Type:	If docs needed, set a value
Doc Text:	A flaw use-after-free in function hci_sock_bound_ioctl() of the Linux kernel HCI subsystem was found in the way user calls ioct HCIUNBLOCKADDR or other way triggers race condition of the call hci_unregister_dev() together with one of the calls hci_sock_blacklist_add(), hci_sock_blacklist_del(), hci_get_conn_info(), hci_get_auth_info(). A privileged local user could use this flaw to crash the system or escalate their privileges on the system.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-11-09 21:25:22 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1968211, 1968212, 1968213, 1968214, 1968215, 1968216, 1968358, 1968359, 1968360, 1968361, 1969475
Bug Blocks:	1966136, 1972622

Description Guilherme de Almeida Suckevicz 2021-06-01 12:42:02 UTC

A use-after-free vulnerability was found in the Linux kernel in function hci_sock_bound_ioctl(). It can allow attackers to corrupt kernel heaps (kmalloc-8k to be specific) and adopt further exploitations.

Comment 4 Guilherme de Almeida Suckevicz 2021-06-08 13:50:59 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1969475]

Comment 9 errata-xmlrpc 2021-11-09 17:23:38 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2021:4140 https://access.redhat.com/errata/RHSA-2021:4140

Comment 10 errata-xmlrpc 2021-11-09 18:27:19 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2021:4356 https://access.redhat.com/errata/RHSA-2021:4356

Comment 11 Product Security DevOps Team 2021-11-09 21:25:19 UTC

This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2021-3573

Comment 12 errata-xmlrpc 2022-02-22 16:57:54 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2022:0620 https://access.redhat.com/errata/RHSA-2022:0620

Comment 13 errata-xmlrpc 2022-02-22 17:00:37 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2022:0622 https://access.redhat.com/errata/RHSA-2022:0622