Bug 1846439 (CVE-2019-20811) - CVE-2019-20811 kernel: net-sysfs: *_queue_add_kobject refcount issue
Summary: CVE-2019-20811 kernel: net-sysfs: *_queue_add_kobject refcount issue
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2019-20811
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1846440 1846454 1846455 1846456 1846457
Blocks: 1846302
TreeView+ depends on / blocked
 
Reported: 2020-06-11 15:22 UTC by Petr Matousek
Modified: 2021-02-16 19:53 UTC (History)
46 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
A flaw was found in the way the rx_queue_add_kobject and netdev_queue_add_kobject functions in the Linux kernel handled refcounting of certain objects. This flaw allows a local user who can trigger the error code path to use this vulnerability to disturb the integrity of the system.
Clone Of:
Environment:
Last Closed: 2020-11-10 14:21:25 UTC
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2020:5023 0 None None None 2020-11-10 13:06:06 UTC
Red Hat Product Errata RHSA-2020:5026 0 None None None 2020-11-10 13:07:24 UTC

Description Petr Matousek 2020-06-11 15:22:29 UTC 
An issue was discovered in the Linux kernel. In rx_queue_add_kobject() and netdev_queue_add_kobject() in net/core/net-sysfs.c, a reference count is mishandled.
Comment 2 Petr Matousek 2020-06-11 15:22:56 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1846440]
Comment 4 Petr Matousek 2020-06-11 15:25:34 UTC 
Mitigation:

Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
Comment 5 Petr Matousek 2020-06-11 15:31:04 UTC 
External References:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a3e23f719f5c4a38ffb3d30c8d7632a4ed8ccd9e
https://nvd.nist.gov/vuln/detail/CVE-2019-20811
Comment 7 Petr Matousek 2020-06-11 15:41:44 UTC 
Statement:

This issue is rated as having Low impact because of the preconditions needed to trigger the error code path (privileges).
Comment 8 Justin M. Forbes 2020-06-12 13:04:33 UTC 
This issue was fixed for Fedora with the 5.0.6 stable kernel updates.
Comment 12 errata-xmlrpc 2020-11-10 13:06:02 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2020:5023 https://access.redhat.com/errata/RHSA-2020:5023
Comment 13 errata-xmlrpc 2020-11-10 13:07:17 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2020:5026 https://access.redhat.com/errata/RHSA-2020:5026
Comment 14 Product Security DevOps Team 2020-11-10 14:21:25 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-2019-20811
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