Bug 1786078 (CVE-2019-19807) - CVE-2019-19807 kernel: use-after-free in sound/core/timer.c
Summary: CVE-2019-19807 kernel: use-after-free in sound/core/timer.c
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2019-19807
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1786080 1795892 1795893 1795894 1795895 1798457 1798459 1798467 1798468 1798469 1798470 1798476 1821714 1821715 1888653
Blocks: 1786081
TreeView+ depends on / blocked
 
Reported: 2019-12-23 10:48 UTC by msiddiqu
Modified: 2023-12-15 17:07 UTC (History)
53 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
A memory flaw was found in the ALSA subsystem of the Linux kernel. The struct snd_timer_instance function fails the timer->max_instances check leading to an invalid address. This could lead to a use-after-free vulnerability.
Clone Of:
Environment:
Last Closed: 2020-07-21 13:27:42 UTC
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2020:3086 0 None None None 2020-07-22 01:04:29 UTC
Red Hat Product Errata RHBA-2020:4416 0 None None None 2020-10-29 15:09:59 UTC
Red Hat Product Errata RHBA-2020:4417 0 None None None 2020-10-29 15:08:31 UTC
Red Hat Product Errata RHBA-2020:4418 0 None None None 2020-10-29 15:13:54 UTC
Red Hat Product Errata RHBA-2020:4419 0 None None None 2020-10-29 15:12:21 UTC
Red Hat Product Errata RHBA-2020:4420 0 None None None 2020-10-29 15:51:16 UTC
Red Hat Product Errata RHSA-2020:3010 0 None None None 2020-07-21 11:04:54 UTC
Red Hat Product Errata RHSA-2020:3016 0 None None None 2020-07-21 11:23:07 UTC
Red Hat Product Errata RHSA-2020:3222 0 None None None 2020-07-29 19:37:18 UTC
Red Hat Product Errata RHSA-2020:4060 0 None None None 2020-09-29 20:52:58 UTC
Red Hat Product Errata RHSA-2020:4062 0 None None None 2020-09-29 18:59:01 UTC

Description msiddiqu 2019-12-23 10:48:50 UTC 
In the Linux kernel, sound/core/timer.c has a use-after-free caused by erroneous code refactoring. This is related to snd_timer_open and snd_timer_close_locked. The timeri variable was originally intended to be for a newly created timer instance, but was used for a different purpose after refactoring.

References: 

https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.3.11

Upstream Patch:

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=e7af6307a8a54f0b873960b32b6a644f2d0fbd97https://github.com/torvalds/linux/commit/e7af6307a8a54f0b873960b32b6a644f2d0fbd97
Comment 1 msiddiqu 2019-12-23 10:49:28 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1786080]
Comment 2 Justin M. Forbes 2019-12-23 15:19:57 UTC 
This was fixed for Fedora with the 5.3.11 stable kernel updates.
Comment 5 Rohit Keshri 2020-01-29 07:26:52 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 10 Rohit Keshri 2020-04-07 12:54:41 UTC 
Statement:

This issue affected Linux kernel versions as shipped with Red Hat Enterprise Linux 8 starting with RHEL-8.1.0, that is Red Hat Enterprise Linux 8.1 GA kernel version.
Comment 13 errata-xmlrpc 2020-07-21 11:04:45 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2020:3010 https://access.redhat.com/errata/RHSA-2020:3010
Comment 14 errata-xmlrpc 2020-07-21 11:23:00 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2020:3016 https://access.redhat.com/errata/RHSA-2020:3016
Comment 15 Product Security DevOps Team 2020-07-21 13:27:42 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-2019-19807
Comment 16 errata-xmlrpc 2020-07-29 19:37:15 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.1 Extended Update Support

Via RHSA-2020:3222 https://access.redhat.com/errata/RHSA-2020:3222
Comment 17 errata-xmlrpc 2020-09-29 18:59:03 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2020:4062 https://access.redhat.com/errata/RHSA-2020:4062
Comment 18 errata-xmlrpc 2020-09-29 20:52:54 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2020:4060 https://access.redhat.com/errata/RHSA-2020:4060
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