Bug 1992745 (CVE-2021-38203) - CVE-2021-38203 kernel: btrfs: deadlock via processes that trigger allocation of new system chunks during times when there is a shortage of free space in the system space_info
Summary: CVE-2021-38203 kernel: btrfs: deadlock via processes that trigger allocation ...
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2021-38203
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: 1992746
Blocks: Embargoed1992747
TreeView+ depends on / blocked
 
Reported: 2021-08-11 17:13 UTC by Guilherme de Almeida Suckevicz
Modified: 2021-08-26 21:34 UTC (History)
44 users (show)

Fixed In Version: kernel 5.14 rc2
Doc Type: If docs needed, set a value
Doc Text:
A flaw was found in the btrfs filesystem in the Linux kernel that allows attackers to cause a denial of service via processes that trigger allocation of new system chunks when there is a shortage of free space in the system space_info. The highest threat from this vulnerability is to system availability.
Clone Of:
Environment:
Last Closed: 2021-08-26 21:34:55 UTC

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Description Guilherme de Almeida Suckevicz 2021-08-11 17:13:44 UTC 
btrfs in the Linux kernel before 5.13.4 allows attackers to cause a denial of service (deadlock) via processes that trigger allocation of new system chunks during times when there is a shortage of free space in the system space_info.

Reference and upstream patch:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1cb3db1cf383a3c7dbda1aa0ce748b0958759947
Comment 1 Guilherme de Almeida Suckevicz 2021-08-11 17:14:11 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1992746]
Comment 2 Justin M. Forbes 2021-08-12 13:21:23 UTC 
This was fixed for Fedora with the 5.13.4 stable kernel updates.
Comment 6 juneau 2021-08-26 16:45:19 UTC 
Setting hosted services 'notaffected' per kernel analysis.
Comment 7 Product Security DevOps Team 2021-08-26 21:34:55 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-2021-38203
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