Bug 1775182 (CVE-2019-19037) - CVE-2019-19037 kernel: null-pointer dereference in ext4_empty_dir in fs/ext4/namei.c
Summary: CVE-2019-19037 kernel: null-pointer dereference in ext4_empty_dir in fs/ext4/...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2019-19037
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: 1775183 1835720 1835721 1835722 1835723 1835724
Blocks: 1775185
TreeView+ depends on / blocked
 
Reported: 2019-11-21 14:30 UTC by Dhananjay Arunesh
Modified: 2021-10-25 22:15 UTC (History)
43 users (show)

Fixed In Version:
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Doc Text:
A NULL pointer dereference flaw was found in the Linux kernel’s Ext4 FileSystem in the way it uses a crafted ext4 image. This flaw allows a local user with physical access to crash the system.
Clone Of:
Environment:
Last Closed: 2021-10-25 22:15:36 UTC
Embargoed:

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Description Dhananjay Arunesh 2019-11-21 14:30:36 UTC 
A vulnerability was found in ext4_empty_dir in fs/ext4/namei.c in the Linux kernel allows a NULL pointer dereference because ext4_read_dirblock(inode,0,DIRENT_HTREE) can be zero.

Reference:
https://github.com/bobfuzzer/CVE/tree/master/CVE-2019-19037
Comment 1 Dhananjay Arunesh 2019-11-21 14:31:03 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1775183]
Comment 2 Justin M. Forbes 2020-03-19 21:56:09 UTC 
This is fixed for Fedora with the 5.4.7 stable kernel updates.
Comment 8 Petr Matousek 2020-05-14 12:05:57 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 9 Petr Matousek 2020-05-14 12:11:51 UTC 
Statement:

This issue is rated as having Low impact because of the preconditions needed to trigger the issue (physical access or user interaction to mount the crafted filesystem image).
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