Bug 2047912 (CVE-2021-22600)

Summary:	CVE-2021-22600 kernel: double free in packet_set_ring() in net/packet/af_packet.c
Product:	[Other] Security Response	Reporter:	Todd Cullum <tcullum>
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, allarkin, bhu, brdeoliv, bskeggs, chwhite, crwood, dhoward, dvlasenk, fhrbata, fpacheco, hdegoede, hkrzesin, jarod, jarodwilson, jburrell, jeremy, jfaracco, jforbes, jglisse, jlelli, joe.lawrence, jonathan, josef, jshortt, jstancek, jwboyer, kcarcia, kernel-maint, kernel-mgr, lgoncalv, linville, lzampier, masami256, mchehab, nmurray, ptalbert, qzhao, rfreire, rvrbovsk, scweaver, steved, vkumar, walters, williams
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	kernel 5.16-rc6	Doc Type:	If docs needed, set a value
Doc Text:	A double-free flaw was found in the Linux kernel’s packet protocol subsystem in the way a user call triggers the packet_set_ring() function of the net/packet/af_packet.c. This flaw allows a local user to crash or escalate their privileges on the system.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2022-05-17 13:46:48 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:	2050248, 2050329, 2050330
Bug Blocks:	2047909

Description Todd Cullum 2022-01-28 20:38:49 UTC

A double free bug in packet_set_ring() in net/packet/af_packet.c can be
exploited by a local user through crafted syscalls to escalate privileges or
deny service.

Reference & upstream patch:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=ec6af094ea28f0f2dda1a6a33b14cd57e36a9755

Comment 2 Alex 2022-02-03 14:29:44 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2050248]

Comment 5 Justin M. Forbes 2022-02-03 23:14:04 UTC

This was fixed for Fedora with the 5.15.11 stable kernel updates.

Comment 14 Product Security DevOps Team 2022-05-17 13:46:45 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-2021-22600