Bug 2018225 (CVE-2021-0935)

Summary:	CVE-2021-0935 kernel: out-of-bounds write due to a use-after-free in ip6_xmit() in ip6_output.c
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
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, bdettelb, bhu, blc, brdeoliv, bskeggs, chwhite, crwood, dhoward, dvlasenk, fhrbata, fpacheco, hdegoede, hkrzesin, jarod, jarodwilson, jburrell, jeremy, jforbes, jglisse, jlelli, jonathan, josef, jshortt, jstancek, jwboyer, kcarcia, kernel-maint, kernel-mgr, lgoncalv, linville, masami256, mchehab, mlangsdo, nmurray, ptalbert, qzhao, rvrbovsk, steved, vkumar, 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:	An out of bounds write flaw in the Linux kernel's IPv6 protocol was found. A local user could use this flaw to crash the system or escalate their privileges on the system.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-11-02 14:08:34 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:	2018226
Bug Blocks:	2018227

Description Guilherme de Almeida Suckevicz 2021-10-28 14:45:55 UTC

In ip6_xmit of ip6_output.c, there is a possible out of bounds write due to a use after free. This could lead to local escalation of privilege with System execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-168607263References: Upstream kernel.

References:
https://source.android.com/security/bulletin/pixel/2021-10-01
https://android.googlesource.com/kernel/common/+/2f987a76a97773beafbc615b9c4d8fe79129a7f4

Comment 1 Guilherme de Almeida Suckevicz 2021-10-28 14:47:12 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2018226]

Comment 3 Product Security DevOps Team 2021-11-02 14:08:34 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-2021-0935

Comment 4 Justin M. Forbes 2021-11-02 20:55:03 UTC

This was fixed for Fedora with the 4.15.15 stable update.