Bug 1786160 (CVE-2019-19767) - CVE-2019-19767 kernel: use-after-free in __ext4_expand_extra_isize and ext4_xattr_set_entry related to fs/ext4/inode.c and fs/ext4/super.c
Summary: CVE-2019-19767 kernel: use-after-free in __ext4_expand_extra_isize and ext4_x...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2019-19767
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: 1786161 1817634 1817635 1817636 1817637 1817638
Blocks: 1786162
TreeView+ depends on / blocked
 
Reported: 2019-12-23 17:19 UTC by Guilherme de Almeida Suckevicz
Modified: 2021-02-16 20:50 UTC (History)
47 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
A use-after-free flaw was found in the Linux kernel’s ext4 file system functionality when the user mount ext4 partition, with the usage of an additional debug parameter is defining an extra inode size. If this parameter has a non zero value, this flaw allows a local user to crash the system when inode expansion happens.
Clone Of:
Environment:
Last Closed: 2020-07-07 19:27:55 UTC
Embargoed:

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Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2020:4416 0 None None None 2020-10-29 15:10:01 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 15:13:56 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 15:51:17 UTC
Red Hat Product Errata RHSA-2020:2854 0 None None None 2020-07-07 13:18:51 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 18:59:04 UTC
Red Hat Product Errata RHSA-2020:4431 0 None None None 2020-11-04 00:50:17 UTC
Red Hat Product Errata RHSA-2020:4609 0 None None None 2020-11-04 02:22:25 UTC

Description Guilherme de Almeida Suckevicz 2019-12-23 17:19:49 UTC 
The Linux kernel before 5.4.2 mishandles ext4_expand_extra_isize, as demonstrated by use-after-free errors in __ext4_expand_extra_isize and ext4_xattr_set_entry, related to fs/ext4/inode.c and fs/ext4/super.c.

References:
https://bugzilla.kernel.org/show_bug.cgi?id=205609
https://bugzilla.kernel.org/show_bug.cgi?id=205707

Upstream commit:
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=4ea99936a1630f51fc3a2d61a58ec4a1c4b7d55a
Comment 1 Guilherme de Almeida Suckevicz 2019-12-23 17:20:57 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1786161]
Comment 2 Justin M. Forbes 2020-03-20 15:13:55 UTC 
This was fixed for Fedora with the 5.3.15 stable kernel updates.
Comment 4 Alex 2020-03-26 17:12:53 UTC 
Mitigation:

The mitigation is not to use debug_want_extra_isize parameter when mounting ext4 FS.
Comment 6 errata-xmlrpc 2020-07-07 13:18:47 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2020:2854 https://access.redhat.com/errata/RHSA-2020:2854
Comment 7 Product Security DevOps Team 2020-07-07 19:27:55 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-2019-19767
Comment 8 errata-xmlrpc 2020-09-29 18:59:05 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 9 errata-xmlrpc 2020-09-29 20:53:00 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
Comment 25 errata-xmlrpc 2020-11-04 00:50:15 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 26 errata-xmlrpc 2020-11-04 02:22:39 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
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