Bug 2089701 (CVE-2022-1882)

Summary:	CVE-2022-1882 kernel: use-after-free in free_pipe_info() could lead to privilege escalation
Product:	[Other] Security Response	Reporter:	Alex <allarkin>
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, bdettelb, bhu, blc, brdeoliv, bskeggs, chwhite, cmaiolin, crwood, ddepaula, debarbos, dhowells, dvlasenk, esandeen, hdegoede, hkrzesin, hpa, ikent, jarod, jarodwilson, jburrell, jfaracco, jferlan, jforbes, jglisse, jlelli, joe.lawrence, jonathan, josef, jshortt, jstancek, jwboyer, jwyatt, kcarcia, kernel-maint, kernel-mgr, lgoncalv, linville, lleshchi, lzampier, masami256, mchehab, mlangsdo, nmurray, psampaio, ptalbert, qzhao, rvrbovsk, scweaver, steve.beattie, steved, tyberry, vkumar, walters, williams
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	Linux kernel 5.18-rc8	Doc Type:	If docs needed, set a value
Doc Text:	A use-after-free flaw was found in the Linux kernel’s pipes functionality in how a user performs manipulations with the pipe post_one_notification() after free_pipe_info() that is already called. This flaw allows a local user to crash or potentially escalate their privileges on the system.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2023-05-09 15:46:17 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:	2090381, 2090382, 2122162
Bug Blocks:	2083438, 2090105, 2106783

Description Alex 2022-05-24 09:32:31 UTC

A UAF flaw in Linux Kernel found in pipes functionality. The problem located in function free_pipe_info of the fs/pipe.c.
When a pipe node is freed, it doesn't make pipe->watch_queue->pipe null. When function post_one_notification is called, it will use this field, but it has been freed and watch_queue->pipe is a dangling pointer.
The problem was introduced since commit db8facfc9fafacefe8a835 "watch_queue, pipe: Free watchqueue state after clearing pipe ring".

Reference:
https://git.kernel.org/linus/353f7988dd8413c4

Comment 4 Alex 2022-05-25 16:04:11 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2090381]

Comment 35 Justin M. Forbes 2022-09-20 14:35:02 UTC

This was fixed for Fedora with the 5.18.15 stable kernel updates.

Comment 39 Rohit Keshri 2023-04-24 17:44:59 UTC

*** Bug 2106777 has been marked as a duplicate of this bug. ***

Comment 40 errata-xmlrpc 2023-05-09 07:11:14 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 41 errata-xmlrpc 2023-05-09 07:50:10 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 42 Product Security DevOps Team 2023-05-09 15:46:13 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-2022-1882