Bug 1433252 (CVE-2017-6951)

Summary: CVE-2017-6951 kernel: NULL pointer dereference in keyring_search_aux function
Product: [Other] Security Response Reporter: Andrej Nemec <anemec>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED ERRATA QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: aquini, bhu, carnil, dhoward, dhowells, fhrbata, gansalmon, hannsj_uhl, htaira, hwkernel-mgr, iboverma, ichavero, itamar, jforbes, jkacur, jonathan, jross, jwboyer, kernel-maint, kernel-mgr, labbott, lgoncalv, madhu.chinakonda, matt, mchehab, mcressma, nmurray, pholasek, plougher, rt-maint, rvrbovsk, slawomir, vdronov, williams, wmealing, yozone
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
The keyring_search_aux function in security/keys/keyring.c in the Linux kernel allows local users to cause a denial of service via a request_key system call for the "dead" key type.
 Story Points: ---
Clone Of: Environment:
Last Closed: 2019-06-08 03:09:06 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: 1439264, 1471601, 1471602, 1471603, 1471604, 1471605, 1471606, 1471607, 1476140, 1476141, 1476142, 1490917    
Bug Blocks: 1433253    
Attachments:
Description Flags
Fix to rename the 'dead' type to '.dead' to make syscalls reject the name none

Description Andrej Nemec 2017-03-17 08:09:55 UTC 
The keyring_search_aux function in security/keys/keyring.c in the Linux kernel allows local users to cause a denial of service (NULL pointer dereference and OOPS) via a request_key system call for the "dead" type.

References:

http://www.spinics.net/lists/keyrings/msg01846.html

Upstream patch:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c06cfb08b88d
Comment 1 David Howells 2017-04-05 08:05:17 UTC 
Created attachment 1268882 [details]
Fix to rename the 'dead' type to '.dead' to make syscalls reject the name
Comment 4 Wade Mealing 2017-07-17 04:24:11 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1471601]
Comment 6 Wade Mealing 2017-07-17 05:56:01 UTC 
Statement:

This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5.

This issue affects the Linux kernel packages as shipped with Red Hat Enterprise Linux 6, 7 and MRG-2.

Future Linux kernel updates for the respective releases may address this issue.
Comment 9 Justin M. Forbes 2017-07-17 14:06:52 UTC 
This was fixed upstream in 4.11 kernels, and backported to 4.10.13 stable series. The fix was pushed to all Fedora releases with 4.10.13 on 2017-05-04.
Comment 11 errata-xmlrpc 2017-08-01 19:14:08 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2017:2077 https://access.redhat.com/errata/RHSA-2017:2077
Comment 12 errata-xmlrpc 2017-08-02 07:54:18 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2017:1842 https://access.redhat.com/errata/RHSA-2017:1842
Comment 13 errata-xmlrpc 2017-09-06 20:40:28 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise MRG 2

Via RHSA-2017:2669 https://access.redhat.com/errata/RHSA-2017:2669