Bug 1805887 (CVE-2020-8992) - CVE-2020-8992 kernel: soft lockup via a crafted journal size in ext4_protect_reserved_inode in fs/ext4/block_validity.c
Summary: CVE-2020-8992 kernel: soft lockup via a crafted journal size in ext4_protect_...
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2020-8992
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: 1805888
Blocks: 1805889
TreeView+ depends on / blocked
 
Reported: 2020-02-21 17:06 UTC by Guilherme de Almeida Suckevicz
Modified: 2021-02-16 20:32 UTC (History)
46 users (show)

Fixed In Version:
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Doc Text:
A vulnerability was found in ext4_protect_reserved_inode in the fs/ext4/block_validity.c function. This flaw allows an attacker to mount a crafted image with a large size inode journal, causing a denial of service.
Clone Of:
Environment:
Last Closed: 2020-05-20 09:15:21 UTC
Embargoed:

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Description Guilherme de Almeida Suckevicz 2020-02-21 17:06:10 UTC 
A vulnerability was found in ext4_protect_reserved_inode in fs/ext4/block_validity.c. When a local attacker mounts a crafted image with a large size inode journal can cause a denial of service in form of a soft lockup problem.

Reference:
https://patchwork.ozlabs.org/patch/1236118/
Comment 1 Guilherme de Almeida Suckevicz 2020-02-21 17:07:04 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1805888]
Comment 2 Justin M. Forbes 2020-02-21 23:25:40 UTC 
This was fixed for Fedora with the 5.5.5 kernel rebase for F31 and the 5.4.21 stable kernel update for F30.
Comment 5 Rohit Keshri 2020-04-14 09:02:30 UTC 
Statement:

The affected code was not introduced into any kernel versions shipped with Red Hat Enterprise Linux making this vulnerable not applicable to these platforms.
Comment 6 Rohit Keshri 2020-04-14 09:02:40 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 8 Product Security DevOps Team 2020-04-14 10:31:49 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-2020-8992
Comment 11 Product Security DevOps Team 2020-05-20 09:15:21 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-2020-8992
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