Bug 2134380 (CVE-2022-4128)

Summary:	CVE-2022-4128 kernel: mptcp: NULL pointer dereference in subflow traversal at disconnect time
Product:	[Other] Security Response	Reporter:	Mauro Matteo Cascella <mcascell>
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, bhu, brdeoliv, chwhite, crwood, ddepaula, debarbos, dvlasenk, ezulian, hkrzesin, jarod, jburrell, jfaracco, jferlan, jforbes, jlelli, joe.lawrence, jshortt, jstancek, jwyatt, kcarcia, kernel-mgr, lgoncalv, lleshchi, lzampier, nmurray, ptalbert, qzhao, rvrbovsk, scweaver, tyberry, vkumar, walters, williams
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	kernel 5.19	Doc Type:	If docs needed, set a value
Doc Text:	A NULL pointer dereference issue was discovered in the Linux kernel. This issue occurs in the MPTCP protocol when traversing the subflow list at disconnect time. A local user could potentially crash the system, causing a denial of service.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2023-05-09 17:12:45 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:	2137858, 2145214, 2145215, 2145216
Bug Blocks:	2121459

Description Mauro Matteo Cascella 2022-10-13 10:08:39 UTC

At disconnect time the MPTCP protocol traverse the subflows list closing each of them. In some circumstances - MPJ subflow, passive MPTCP socket, the latter operation can remove the subflow from the list, invalidating the current iterator. This could lead to a NULL pointer dereference issue.

Upstream patch & commit:
https://lore.kernel.org/netdev/20220708233610.410786-2-mathew.j.martineau@linux.intel.com/
https://github.com/torvalds/linux/commit/5c835bb142d4

Comment 5 Mauro Matteo Cascella 2022-11-23 14:23:59 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2145216]

Comment 6 Justin M. Forbes 2022-11-30 20:06:12 UTC

This was fixed for Fedora with the 5.18.13 stable kernel updates.

Comment 9 errata-xmlrpc 2023-05-09 07:11:54 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2023:2148 https://access.redhat.com/errata/RHSA-2023:2148

Comment 10 errata-xmlrpc 2023-05-09 07:51:35 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2023:2458 https://access.redhat.com/errata/RHSA-2023:2458

Comment 11 Product Security DevOps Team 2023-05-09 17:12:41 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-2022-4128