Bug 1897668 (CVE-2020-27815)

Summary:	CVE-2020-27815 kernel: Array index out of bounds access when setting extended attributes on journaling filesystems.
Product:	[Other] Security Response	Reporter:	Pedro Sampaio <psampaio>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED WONTFIX	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	acaringi, adscvr, airlied, bhu, blc, bmasney, brdeoliv, bskeggs, dhoward, dvlasenk, esammons, fhrbata, hdegoede, hkrzesin, iboverma, itamar, jarodwilson, jeremy, jforbes, jglisse, jlelli, jonathan, josef, jross, jshortt, jstancek, jwboyer, kcarcia, kernel-maint, kernel-mgr, lgoncalv, linville, masami256, mchehab, mcressma, mjg59, mlangsdo, nmurray, pmatouse, ptalbert, qzhao, rt-maint, rvrbovsk, security-response-team, steved, walters, williams, wmealing
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 JFS filesystem code. This flaw allows a local attacker with the ability to set extended attributes to panic the system, causing memory corruption or escalating privileges. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2020-11-26 16:36:37 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:	1902831, 1911186
Bug Blocks:	1897669, 1939829

Description Pedro Sampaio 2020-11-13 17:57:19 UTC

A flaw was found in the Linux kernels implementation of extended attributes while working on a journaled filesystem.  

An attacker with local access with permissions to modify extended attributes on a local filesystem can possibly crash the system.

Comment 7 Guilherme de Almeida Suckevicz 2020-11-30 19:25:08 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1902831]

Comment 9 Justin M. Forbes 2021-03-04 22:03:28 UTC

This was fixed for Fedora with the 5.10.4 stable kernel updates.