Bug 1786179 (CVE-2019-19770) - CVE-2019-19770 kernel: use-after-free in debugfs_remove in fs/debugfs/inode.c
Summary: CVE-2019-19770 kernel: use-after-free in debugfs_remove in fs/debugfs/inode.c
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2019-19770
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1890029 1786181 1816556 1816557 1816558 1816559 1816560 1890026 1890027 1890028 1890030
Blocks: 1786180
TreeView+ depends on / blocked
 
Reported: 2019-12-23 18:08 UTC by Guilherme de Almeida Suckevicz
Modified: 2021-02-16 20:50 UTC (History)
48 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
A use-after-free flaw was found in the debugfs_remove function in the Linux kernel. The flaw could allow a local attacker with special user (or root) privilege to crash the system at the time of file or directory removal. This vulnerability can lead to a kernel information leak. The highest threat from this vulnerability is to system availability.
Clone Of:
Environment:
Last Closed: 2020-11-04 02:23:53 UTC
Embargoed:
rkeshri: needinfo+

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2020:4431 0 None None None 2020-11-04 00:50:25 UTC
Red Hat Product Errata RHSA-2020:4609 0 None None None 2020-11-04 02:22:28 UTC

Description Guilherme de Almeida Suckevicz 2019-12-23 18:08:49 UTC 
A use-after-free flaw was found in the debugfs_remove function in the Linux kernel. The flaw could allow a local attacker with special user (or root) privilege to crash the system at the time of file or directory removal. This vulnerability can lead to a kernel information leak. The highest threat from this vulnerability is to system availability.

Reference:
https://bugzilla.kernel.org/show_bug.cgi?id=205713
https://lore.kernel.org/linux-block/20200402000002.7442-1-mcgrof@kernel.org/
Comment 1 Guilherme de Almeida Suckevicz 2019-12-23 18:09:38 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1786181]
Comment 17 Dave Chinner 2020-04-02 01:02:08 UTC 
https://lore.kernel.org/linux-fsdevel/20200402000002.7442-1-mcgrof@kernel.org/T/#mc62cc15324d1da505c6a9c50e3363f4d20537d45

Looks like it's just a blktrace bug, not a critical security problem:

"We there would like to contend CVE-2019-19770 as invalid. The
implications suggested are not correct, and this issue is only
triggerable with root, by shooting yourself on the foot by misuing
blktrace."

-Dave.
Comment 23 Rohit Keshri 2020-05-15 07:49:53 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 26 errata-xmlrpc 2020-11-04 00:50:23 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2020:4431 https://access.redhat.com/errata/RHSA-2020:4431
Comment 27 errata-xmlrpc 2020-11-04 02:22:42 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2020:4609 https://access.redhat.com/errata/RHSA-2020:4609
Comment 28 Product Security DevOps Team 2020-11-04 02:23:53 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-2019-19770
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