Ubuntu alert USN-5279-1 (util-linux)

From:
             
 
Marc Deslauriers <marc.deslauriers@canonical.com>
To:
             
 
"ubuntu-security-announce@lists.ubuntu.com" <ubuntu-security-announce@lists.ubuntu.com>
Subject:
             
 
[USN-5279-1] util-linux vulnerabilities
Date:
             
 
Wed, 09 Feb 2022 09:17:09 -0500
Message-ID:
             
 
<d12851a5-c550-294f-236e-b1c535f01b10@canonical.com>
==========================================================================
Ubuntu Security Notice USN-5279-1
February 09, 2022

util-linux vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 21.10
- Ubuntu 20.04 LTS

Summary:

util-linux could be made to unmount FUSE filesystems belonging to other
users.

Software Description:
- util-linux: miscellaneous system utilities

Details:

It was discovered that util-linux incorrectly handled unmounting FUSE
filesystems. A local attacker could possibly use this issue to unmount
FUSE filesystems belonging to other users.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 21.10:
  mount                           2.36.1-8ubuntu2.2
  util-linux                      2.36.1-8ubuntu2.2

Ubuntu 20.04 LTS:
  mount                           2.34-0.1ubuntu9.3
  util-linux                      2.34-0.1ubuntu9.3

In general, a standard system update will make all the necessary changes.

References:
  https://ubuntu.com/security/notices/USN-5279-1
  CVE-2021-3995, CVE-2021-3996

Package Information:
  https://launchpad.net/ubuntu/+source/util-linux/2.36.1-8u...
  https://launchpad.net/ubuntu/+source/util-linux/2.34-0.1u...
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