Bug 730917 (CVE-2011-2942)

Summary: CVE-2011-2942 kernel: bridge: null pointer dereference in __br_deliver
Product: [Other] Security Response Reporter: Eugene Teo (Security Response) <eteo>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED ERRATA QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: amwang, anton, arozansk, bhu, davej, dhoward, fhrbata, jkacur, kernel-mgr, kmcmartin, lgoncalv, lwang, plougher, pmatouse, rt-maint, security-response-team, sforsber, tcallawa, vgoyal, williams
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2012-05-10 08:17:32 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: 703045, 730756, 730949, 730950, 748679    
Bug Blocks: 730794    

Description Eugene Teo (Security Response) 2011-08-16 08:50:57 UTC 
In the br_forward_finish() function, we may call kfree() on the skb we are forwarding, and so, after it, we should not dereference skb->dev pointer. With the fix, we save skb->dev before calling the br_forward_finish() function, so that we can use it afterwards.
Comment 4 Eugene Teo (Security Response) 2011-09-20 07:04:03 UTC 
Statement:

This issue did not affect the Linux kernel as shipped with Red Hat Enterprise Linux 4, 6, and Red Hat Enterprise MRG. This has been addressed in Red Hat Enterprise Linux 5 via https://rhn.redhat.com/errata/RHSA-2011-1386.html.
Comment 6 errata-xmlrpc 2011-10-20 17:29:02 UTC 
This issue has been addressed in following products:

  Red Hat Enterprise Linux 5

Via RHSA-2011:1386 https://rhn.redhat.com/errata/RHSA-2011-1386.html
Comment 7 Eugene Teo (Security Response) 2011-10-25 03:52:27 UTC 
Created kernel tracking bugs for this issue

Affects: fedora-all [bug 748679]
Comment 8 errata-xmlrpc 2011-10-26 15:32:46 UTC 
This issue has been addressed in following products:

  RHEV-H, V2V and Agents for RHEL-5

Via RHSA-2011:1408 https://rhn.redhat.com/errata/RHSA-2011-1408.html