Bug 1941804 (CVE-2021-28964) - CVE-2021-28964 kernel: race condition in get_old_root function in fs/btrfs/ctree.c because of a lack of locking on an extent buffer before a cloning operation
Summary: CVE-2021-28964 kernel: race condition in get_old_root function in fs/btrfs/ct...
Keywords:
Status: NEW
Alias: CVE-2021-28964
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Nobody
QA Contact:
URL:
Whiteboard:
Depends On: 1941805 1950249 1950250
Blocks: 1941806
TreeView+ depends on / blocked
 
Reported: 2021-03-22 19:40 UTC by Guilherme de Almeida Suckevicz
Modified: 2023-09-19 14:13 UTC (History)
37 users (show)

Fixed In Version: kernel 5.12 rc4
Doc Type: If docs needed, set a value
Doc Text:
A race condition flaw was found in get_old_root in fs/btrfs/ctree.c in the Linux kernel in btrfs file-system. This flaw allows a local attacker with a special user privilege to cause a denial of service due to not locking an extent buffer before a cloning operation. The highest threat from this vulnerability is to system availability.
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Description Guilherme de Almeida Suckevicz 2021-03-22 19:40:47 UTC 
A race condition flaw was found in get_old_root in fs/btrfs/ctree.c in the Linux kernel in btrfs file-system. This flaw allows a local attacker with a special user privilege to cause a denial of service due to not locking an extent buffer before a cloning operation. The highest threat from this vulnerability is to system availability.

Reference and upstream patch:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=dbcc7d57bffc0c8cac9dac11bec548597d59a6a5
Comment 1 Guilherme de Almeida Suckevicz 2021-03-22 19:41:49 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1941805]
Comment 4 Rohit Keshri 2021-04-16 08:15:00 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 7 Rohit Keshri 2021-04-16 08:49:54 UTC 
Statement:

This issue affected Linux kernel versions as shipped with Red Hat Enterprise Linux 7  / 7-RT.
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