CVE-2021-3996
util-linux: A logic error was found in the libmount library of util-linux in the function that allows an unprivileged user to unm...
CVE-2021-3996 is fixed in 39 products on 1 platform, first by bsdextrautils 2.37.2-4ubuntu2, released January 31, 2022. It is not reported as exploited. Patch Radar priority: Routine.
Routine
CVSS
5.5
medium
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0064
50th percentile
A logic error was found in the libmount library of util-linux in the function that allows an unprivileged user to unmount a FUSE filesystem. This flaw allows a local user on a vulnerable system to unmount other users' filesystems that are either world-writable themselves (like /tmp) or mounted in a world-writable directory. An attacker may use this flaw to cause a denial of service to applications that use the affected filesystems.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| bsdextrautils · Ubuntu 22.04.1 LTS (jammy) | 2.37.2-4ubuntu2 | bsdextrautils 2.37.2-4ubuntu2 | Jan 31, 2022 |
| bsdutils · Ubuntu 20.04 LTS (focal) | 1:2.34-0.1ubuntu9.3 | bsdutils 1:2.34-0.1ubuntu9.3 | Jan 31, 2022 |
| bsdutils · Ubuntu 22.04.1 LTS (jammy) | 1:2.37.2-4ubuntu2 | bsdutils 1:2.37.2-4ubuntu2 | Jan 31, 2022 |
| eject · Ubuntu 22.04.1 LTS (jammy) | 2.37.2-4ubuntu2 | eject 2.37.2-4ubuntu2 | Jan 31, 2022 |
| fdisk · Ubuntu 20.04 LTS (focal) | 2.34-0.1ubuntu9.3 | fdisk 2.34-0.1ubuntu9.3 | Jan 31, 2022 |
| fdisk · Ubuntu 22.04.1 LTS (jammy) | 2.37.2-4ubuntu2 | fdisk 2.37.2-4ubuntu2 | Jan 31, 2022 |
| libblkid · amzn 2023 | 2.37.4-1.amzn2023.0.3 | ALAS2023-2023-024 | Feb 17, 2023 |
| libblkid-debuginfo · amzn 2023 | 2.37.4-1.amzn2023.0.3 | ALAS2023-2023-024 | Feb 17, 2023 |
| libblkid-devel · amzn 2023 | 2.37.4-1.amzn2023.0.3 | ALAS2023-2023-024 | Feb 17, 2023 |
| libblkid1 · Ubuntu 20.04 LTS (focal) | 2.34-0.1ubuntu9.3 | libblkid1 2.34-0.1ubuntu9.3 | Jan 31, 2022 |
| libblkid1 · Ubuntu 22.04.1 LTS (jammy) | 2.37.2-4ubuntu2 | libblkid1 2.37.2-4ubuntu2 | Jan 31, 2022 |
| libfdisk · amzn 2023 | 2.37.4-1.amzn2023.0.3 | ALAS2023-2023-024 | Feb 17, 2023 |
| libfdisk-debuginfo · amzn 2023 | 2.37.4-1.amzn2023.0.3 | ALAS2023-2023-024 | Feb 17, 2023 |
| libfdisk-devel · amzn 2023 | 2.37.4-1.amzn2023.0.3 | ALAS2023-2023-024 | Feb 17, 2023 |
| libfdisk1 · Ubuntu 20.04 LTS (focal) | 2.34-0.1ubuntu9.3 | libfdisk1 2.34-0.1ubuntu9.3 | Jan 31, 2022 |
| libfdisk1 · Ubuntu 22.04.1 LTS (jammy) | 2.37.2-4ubuntu2 | libfdisk1 2.37.2-4ubuntu2 | Jan 31, 2022 |
| libmount · amzn 2023 | 2.37.4-1.amzn2023.0.3 | ALAS2023-2023-024 | Feb 17, 2023 |
| libmount-debuginfo · amzn 2023 | 2.37.4-1.amzn2023.0.3 | ALAS2023-2023-024 | Feb 17, 2023 |
| libmount-devel · amzn 2023 | 2.37.4-1.amzn2023.0.3 | ALAS2023-2023-024 | Feb 17, 2023 |
| libmount1 · Ubuntu 20.04 LTS (focal) | 2.34-0.1ubuntu9.3 | libmount1 2.34-0.1ubuntu9.3 | Jan 31, 2022 |
| libmount1 · Ubuntu 22.04.1 LTS (jammy) | 2.37.2-4ubuntu2 | libmount1 2.37.2-4ubuntu2 | Jan 31, 2022 |
| libsmartcols · amzn 2023 | 2.37.4-1.amzn2023.0.3 | ALAS2023-2023-024 | Feb 17, 2023 |
| libsmartcols-debuginfo · amzn 2023 | 2.37.4-1.amzn2023.0.3 | ALAS2023-2023-024 | Feb 17, 2023 |
| libsmartcols-devel · amzn 2023 | 2.37.4-1.amzn2023.0.3 | ALAS2023-2023-024 | Feb 17, 2023 |
| libsmartcols1 · Ubuntu 20.04 LTS (focal) | 2.34-0.1ubuntu9.3 | libsmartcols1 2.34-0.1ubuntu9.3 | Jan 31, 2022 |
| libsmartcols1 · Ubuntu 22.04.1 LTS (jammy) | 2.37.2-4ubuntu2 | libsmartcols1 2.37.2-4ubuntu2 | Jan 31, 2022 |
| libuuid · amzn 2023 | 2.37.4-1.amzn2023.0.3 | ALAS2023-2023-024 | Feb 17, 2023 |
| libuuid-debuginfo · amzn 2023 | 2.37.4-1.amzn2023.0.3 | ALAS2023-2023-024 | Feb 17, 2023 |
| libuuid-devel · amzn 2023 | 2.37.4-1.amzn2023.0.3 | ALAS2023-2023-024 | Feb 17, 2023 |
| libuuid1 · Ubuntu 20.04 LTS (focal) | 2.34-0.1ubuntu9.3 | libuuid1 2.34-0.1ubuntu9.3 | Jan 31, 2022 |
| libuuid1 · Ubuntu 22.04.1 LTS (jammy) | 2.37.2-4ubuntu2 | libuuid1 2.37.2-4ubuntu2 | Jan 31, 2022 |
| mount · Ubuntu 20.04 LTS (focal) | 2.34-0.1ubuntu9.3 | mount 2.34-0.1ubuntu9.3 | Jan 31, 2022 |
| mount · Ubuntu 22.04.1 LTS (jammy) | 2.37.2-4ubuntu2 | mount 2.37.2-4ubuntu2 | Jan 31, 2022 |
| python3-libmount · amzn 2023 | 2.37.4-1.amzn2023.0.3 | ALAS2023-2023-024 | Feb 17, 2023 |
| python3-libmount-debuginfo · amzn 2023 | 2.37.4-1.amzn2023.0.3 | ALAS2023-2023-024 | Feb 17, 2023 |
| rfkill · Ubuntu 20.04 LTS (focal) | 2.34-0.1ubuntu9.3 | rfkill 2.34-0.1ubuntu9.3 | Jan 31, 2022 |
| rfkill · Ubuntu 22.04.1 LTS (jammy) | 2.37.2-4ubuntu2 | rfkill 2.37.2-4ubuntu2 | Jan 31, 2022 |
| util-linux · Debian 12.15 (bookworm) | 2.37.3-1 | DEBIAN-CVE-2021-3996 | Aug 23, 2022 |
| util-linux · Debian 13.5 (trixie) | 2.37.3-1 | DEBIAN-CVE-2021-3996 | Aug 23, 2022 |
| util-linux · Debian 14 | 2.37.3-1 | DEBIAN-CVE-2021-3996 | Aug 23, 2022 |
| util-linux · Ubuntu 20.04 LTS (focal) | 2.34-0.1ubuntu9.3 | util-linux 2.34-0.1ubuntu9.3 | Jan 31, 2022 |
| util-linux · Ubuntu 22.04.1 LTS (jammy) | 2.37.2-4ubuntu2 | util-linux 2.37.2-4ubuntu2 | Jan 31, 2022 |
| util-linux · amzn 2023 | 2.37.4-1.amzn2023.0.3 | ALAS2023-2023-024 | Feb 17, 2023 |
| util-linux-core · amzn 2023 | 2.37.4-1.amzn2023.0.3 | ALAS2023-2023-024 | Feb 17, 2023 |
| util-linux-core-debuginfo · amzn 2023 | 2.37.4-1.amzn2023.0.3 | ALAS2023-2023-024 | Feb 17, 2023 |
| util-linux-debuginfo · amzn 2023 | 2.37.4-1.amzn2023.0.3 | ALAS2023-2023-024 | Feb 17, 2023 |
| util-linux-debugsource · amzn 2023 | 2.37.4-1.amzn2023.0.3 | ALAS2023-2023-024 | Feb 17, 2023 |
| util-linux-locales · Ubuntu 20.04 LTS (focal) | 2.34-0.1ubuntu9.3 | util-linux-locales 2.34-0.1ubuntu9.3 | Jan 31, 2022 |
| util-linux-locales · Ubuntu 22.04.1 LTS (jammy) | 2.37.2-4ubuntu2 | util-linux-locales 2.37.2-4ubuntu2 | Jan 31, 2022 |
| util-linux-user · amzn 2023 | 2.37.4-1.amzn2023.0.3 | ALAS2023-2023-024 | Feb 17, 2023 |
| util-linux-user-debuginfo · amzn 2023 | 2.37.4-1.amzn2023.0.3 | ALAS2023-2023-024 | Feb 17, 2023 |
| uuid-runtime · Ubuntu 20.04 LTS (focal) | 2.34-0.1ubuntu9.3 | uuid-runtime 2.34-0.1ubuntu9.3 | Jan 31, 2022 |
| uuid-runtime · Ubuntu 22.04.1 LTS (jammy) | 2.37.2-4ubuntu2 | uuid-runtime 2.37.2-4ubuntu2 | Jan 31, 2022 |
| uuidd · amzn 2023 | 2.37.4-1.amzn2023.0.3 | ALAS2023-2023-024 | Feb 17, 2023 |
| uuidd-debuginfo · amzn 2023 | 2.37.4-1.amzn2023.0.3 | ALAS2023-2023-024 | Feb 17, 2023 |
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