Bug 1997958 (CVE-2021-3739) - CVE-2021-3739 kernel: null-ptr-dereference bug in btrfs_rm_device in fs/btrfs/volumes.c
Summary: CVE-2021-3739 kernel: null-ptr-dereference bug in btrfs_rm_device in fs/btrfs...
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2021-3739
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: 1997960
Blocks: Embargoed1997939 Red Hat2002254
TreeView+ depends on / blocked
 
Reported: 2021-08-26 07:26 UTC by Dhananjay Arunesh
Modified: 2021-09-08 15:11 UTC (History)
42 users (show)

Fixed In Version:
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Doc Text:
A NULL pointer dereference flaw was found in the btrfs_rm_device function in fs/btrfs/volumes.c in the Linux Kernel, where triggering the bug requires ‘CAP_SYS_ADMIN’. This flaw allows a local attacker to crash the system or leak kernel internal information. The highest threat from this vulnerability is to system availability.
Clone Of:
Environment:
Last Closed: 2021-08-30 11:57:30 UTC

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Description Dhananjay Arunesh 2021-08-26 07:26:25 UTC 
A NULL pointer dereference flaw was found in btrfs_rm_device function in fs/btrfs/volumes.c in Linux Kernel, where triggering the bug requires ‘CAP_SYS_ADMIN’. This could allow a local attacker to crash the system or leak kernel internal information.

References:
https://lore.kernel.org/linux-btrfs/CAFcO6XO5TC5sEo-C9JGC75JkNAzkOSSLA3a=bwQqXFFbRTZ7Gw@mail.gmail.com/T/#md4b850f33616b7364f86e6fed144abc925f3669c
https://lore.kernel.org/linux-btrfs/20210806102415.304717-1-wqu@suse.com/T/#u
Comment 1 Dhananjay Arunesh 2021-08-26 07:29:44 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1997960]
Comment 6 Product Security DevOps Team 2021-08-30 11:57:30 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-2021-3739
Comment 7 Justin M. Forbes 2021-09-08 15:11:32 UTC 
This was fixed for Fedora with the 5.13.14 stable kernel updates.
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