Bug 1750813 (CVE-2019-15916)

Summary: CVE-2019-15916 kernel: memory leak in register_queue_kobjects() in net/core/net-sysfs.c leads to denial of service
Product: [Other] Security Response Reporter: Dhananjay Arunesh <darunesh>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED ERRATA QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: acaringi, airlied, bhu, blc, brdeoliv, bskeggs, dhoward, dvlasenk, esammons, fhrbata, hdegoede, hkrzesin, iboverma, ichavero, itamar, jarodwilson, jeremy, jforbes, jglisse, jlelli, john.j5live, jonathan, josef, jross, jshortt, jstancek, jwboyer, kernel-maint, kernel-mgr, labbott, lgoncalv, linville, masami256, matt, mchehab, mcressma, mjg59, mlangsdo, mmilgram, nmurray, plougher, rt-maint, rvrbovsk, sbrivio, steved, williams, wmealing, yozone
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 that allowed an attacker to leak kernel memory was found in the network subsystem where an attacker with permissions to create tun/tap devices can create a denial of service and panic the system.
Story Points: ---
Clone Of: Environment:
Last Closed: 2019-11-06 00:53:29 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: 1718393, 1750814, 1752690, 1752691, 1752692, 1752693, 1752694, 1752695, 1752700, 1828334, 1828335, 1838782, 1838783    
Bug Blocks: 1750818    

Description Dhananjay Arunesh 2019-09-10 14:05:41 UTC
An issue was discovered in the Linux kernels network tun/tap device creation. An attacker with local account can issue an ioctl to a device which can cause a small memory leak which can not be reclaimed.  Each time this attack is repeated additional memory is leaked and this may eventually consume all memory in the system causing a denial of service DOS.

Reference:
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.0.1
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=895a5e96dbd6386c8e78e5b78e067dcc67b7f0ab

Comment 1 Dhananjay Arunesh 2019-09-10 14:06:12 UTC
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1750814]

Comment 2 Justin M. Forbes 2019-09-11 08:14:54 UTC
This was fixed for Fedora with the 4.20.15 stable kernel updates

Comment 4 Wade Mealing 2019-09-17 01:41:05 UTC
This flaw is rated as moderate, it is a memory leak that a requires a a local user to have access privileges on a local network device and the ability to issue an ioctl to a tun/tap device. This is usually a priviledged operation and not available to all users on the system.

Comment 11 errata-xmlrpc 2019-11-05 20:35:51 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2019:3309 https://access.redhat.com/errata/RHSA-2019:3309

Comment 12 errata-xmlrpc 2019-11-05 21:06:35 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2019:3517 https://access.redhat.com/errata/RHSA-2019:3517

Comment 13 Product Security DevOps Team 2019-11-06 00:53:29 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-2019-15916

Comment 14 errata-xmlrpc 2020-03-09 14:31:47 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2020:0740 https://access.redhat.com/errata/RHSA-2020:0740

Comment 15 errata-xmlrpc 2020-03-31 19:11:56 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2020:1016 https://access.redhat.com/errata/RHSA-2020:1016

Comment 16 errata-xmlrpc 2020-03-31 19:21:05 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2020:1070 https://access.redhat.com/errata/RHSA-2020:1070

Comment 21 errata-xmlrpc 2020-06-11 02:10:12 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7.7 Extended Update Support

Via RHSA-2020:2522 https://access.redhat.com/errata/RHSA-2020:2522

Comment 23 errata-xmlrpc 2020-07-07 09:52:01 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7.6 Extended Update Support

Via RHSA-2020:2851 https://access.redhat.com/errata/RHSA-2020:2851