Bug 2068577 (CVE-2021-39636)

Summary:	CVE-2021-39636 kernel: information disclosure due to uninitialized data in do_ipt_get_ctl() and do_ipt_set_ctl() in ip_tables.c
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
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, alciregi, bdettelb, bhu, bskeggs, chwhite, crwood, dhoward, dvlasenk, fhrbata, hdegoede, hkrzesin, hpa, jarod, jarodwilson, jburrell, jeremy, jfaracco, jforbes, jglisse, jlelli, joe.lawrence, jonathan, josef, jshortt, jstancek, jwboyer, jwyatt, kcarcia, kernel-maint, kernel-mgr, lgoncalv, linville, lzampier, masami256, mchehab, nmurray, ptalbert, qzhao, rvrbovsk, scweaver, security-response-team, steved, vkumar, walters, williams
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	kernel 4.11 rc1	Doc Type:	If docs needed, set a value
Doc Text:	A vulnerability was found in the Linux kernel’s net/ipv6/netfilter/ip6_tables.c:copy_entries_to_user function. This flaw allows a local attacker to leak internal kernel information.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2022-08-30 18:25:55 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:
Bug Blocks:	2068578

Description Guilherme de Almeida Suckevicz 2022-03-25 17:33:43 UTC

In do_ipt_get_ctl and do_ipt_set_ctl of ip_tables.c, there is a possible way to leak kernel information due to uninitialized data. This could lead to local information disclosure with system execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-120612905References: Upstream kernel.

Reference and upstream patches:
https://source.android.com/security/bulletin/pixel/2021-12-01
https://android.googlesource.com/kernel/common/+/8a1b3c7bd71ef1e7a4537216858dbe7d13eec6ed
https://android.googlesource.com/kernel/common/+/d104670ce30b9f910f39fbaad3ec59f87fa43468
https://android.googlesource.com/kernel/common/+/bb5bc03a5056b4b22f00b7333c42c861b83ef19f
https://android.googlesource.com/kernel/common/+/dcd0c8c3e87cf08344e169fdb94eb7ec96c3c32a
https://android.googlesource.com/kernel/common/+/823f05d71506017aa4d47ae8b9546081686098fe

Comment 7 Product Security DevOps Team 2022-08-30 18:25:51 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-2021-39636