CVE-2021-3995
3Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackepss 0.6%
exploitation probability
0.6%top 51% of all CVEs
observed exploitation
nono source reports it
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 an unprivileged local attacker to unmount FUSE filesystems that belong to certain other users who have a UID that is a prefix of the UID of the attacker in its string form. An attacker may use this flaw to cause a denial of service to applications that use the affected filesystems.
Affected products
n/a · util-linuxReferences
http://packetstormsecurity.com/files/170176/snap-confine-must_mkdir_and_open_with_perms-Race-Condition.htmlhttps://bugzilla.redhat.com/show_bug.cgi?id=2024631https://access.redhat.com/security/cve/CVE-2021-3995http://seclists.org/fulldisclosure/2022/Dec/4https://github.com/util-linux/util-linux/commit/57202f5713afa2af20ffbb6ab5331481d0396f8dhttps://mirrors.edge.kernel.org/pub/linux/utils/util-linux/v2.37/v2.37.3-ReleaseNoteshttps://security.gentoo.org/glsa/202401-08https://security.netapp.com/advisory/ntap-20221209-0002/https://www.openwall.com/lists/oss-security/2022/01/24/2http://www.openwall.com/lists/oss-security/2022/11/30/2