Bug 1959514 (CVE-2021-23134)

Summary:	CVE-2021-23134 kernel: use-after-free in nfc sockets
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	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, jglisse, jlelli, jonathan, josef, jshortt, jstancek, jwboyer, kcarcia, kernel-maint, kernel-mgr, lgoncalv, linville, masami256, mchehab, mlangsdo, nmurray, ptalbert, qzhao, rvrbovsk, steved, walters, wcosta, williams
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:	A flaw was found in the Linux kernel. A use-after-free was found in the implementation of nfc sockets leading to a kernel privilege escalation from the context of an unprivileged user. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-05-13 08:34:08 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:	1959515
Bug Blocks:	1959516

Description Guilherme de Almeida Suckevicz 2021-05-11 17:27:08 UTC

An use-after-free was found in the Linux kernel in the implementation of nfc sockets (in net/nfc/llcp_sock.c). This can lead to kernel privilege escalation from the context of an unprivileged user.

Reference:
https://www.openwall.com/lists/oss-security/2021/05/11/4

Upstream patch:
https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=c61760e6940d

Comment 1 Guilherme de Almeida Suckevicz 2021-05-11 17:27:50 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1959515]

Comment 3 Alex 2021-05-12 15:36:56 UTC

External References:

https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=c61760e6940d

Comment 4 Alex 2021-05-12 18:49:57 UTC

Statement:

This flaw is rated as having a Moderate impact because in the default configuration, the issue can only be triggered by a privileged local user (with capability CAP_NET_RAW).

Comment 5 Product Security DevOps Team 2021-05-13 08:34:08 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-2021-23134