Bug 1903678 (CVE-2020-11935)

Summary:	CVE-2020-11935 kernel: panic hit by kube-proxy iptables-save/restore
Product:	[Other] Security Response	Reporter:	Dhananjay Arunesh <darunesh>
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, 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, ptalbert, qzhao, rt-maint, rvrbovsk, steved, 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 flaw improperly managed inode reference counts in the vfsub_dentry_open() in the Linux kernel aufs subsystem was found in the way local user calls vfsub_dentry_open() method. A local user could use this flaw to crash the system.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2020-12-11 12:47:05 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:	1903680
Bug Blocks:	1903681

Description Dhananjay Arunesh 2020-12-02 16:00:37 UTC

Systems with aufs mounts are vulnerable to a kernel BUG(), which can turn into a panic/crash if panic_on_oops is set.

Comment 1 Dhananjay Arunesh 2020-12-02 16:02:45 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1903680]

Comment 2 Justin M. Forbes 2020-12-03 13:36:14 UTC

The aufs bits are not upstream, and have never been included in a Fedora build.

Comment 3 Product Security DevOps Team 2020-12-11 12:47:05 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-2020-11935