USN-5279-1: util-linux vulnerabilities

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

• 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

• CVE-2021-3995
• CVE-2021-3996