Bug 2156215 (CVE-2022-42328, CVE-2022-42329)

Summary:	CVE-2022-42328 CVE-2022-42329 kernel: Xen Security Advisory 424 v1: guests can trigger deadlock in Linux netback driver
Product:	[Other] Security Response	Reporter:	Alex <allarkin>
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, bskeggs, chwhite, crwood, ddepaula, debarbos, dfreiber, dhoward, dvlasenk, ezulian, fhrbata, hdegoede, hkrzesin, hpa, jarod, jarodwilson, jburrell, jfaracco, jferlan, jforbes, jglisse, jlelli, joe.lawrence, josef, jshortt, jstancek, jwboyer, jwyatt, kcarcia, kernel-maint, kernel-mgr, lgoncalv, linville, lleshchi, lzampier, masami256, mchehab, nmurray, ptalbert, qzhao, rogbas, rvrbovsk, scweaver, steved, tyberry, vkumar, walters, 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 possible deadlock flaw was found in the Linux kernel’s XEN driver in how some packets generated by a user dropped. This flaw allows a local user to crash the system.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2022-12-26 09:01:01 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:	2156216
Bug Blocks:	2152134

Description Alex 2022-12-25 14:53:46 UTC

A flaw in the Linux Kernel XEN found (emulated network device driver). When trying to free the SKB of a packet dropped, the deadlock can happen (CVE-2022-42328).
Additionally when dropping packets for other reasons the same deadlock could occur in case of netpoll being active for the interface the xen-netback driver is connected to (CVE-2022-42329).
A malicious guest could cause Denial of Service (DoS) of the host via the paravirtualized network interface.

References:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/net/xen-netback/interface.c?h=v6.1&id=74e7e1efdad45580cc3839f2a155174cf158f9b5
https://www.openwall.com/lists/oss-security/2022/12/08/2
https://www.openwall.com/lists/oss-security/2022/12/08/3
https://www.openwall.com/lists/oss-security/2022/12/09/2

Comment 1 Alex 2022-12-25 14:54:09 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2156216]

Comment 3 Product Security DevOps Team 2022-12-26 09:00:56 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-2022-42328
https://access.redhat.com/security/cve/cve-2022-42329

Comment 4 Justin M. Forbes 2022-12-31 15:46:20 UTC

This was fixed for Fedora with the 6.0.13 stable kernel release