An util-linux security update has been released for Ubuntu Linux 20.04 LTS and 21.10.
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Ubuntu Security Notice USN-5279-1
February 09, 2022
util-linux vulnerabilities
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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/2.36.1-8ubuntu2.2
https://launchpad.net/ubuntu/+source/util-linux/2.34-0.1ubuntu9.3
