CVEvulnerability
CVE-2021-3996
5.5 MEDIUM
Official page ↗
- Status
- Modified
- Published
- 2022-08-23
- Last modified
- 2026-06-17
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 5.5 MEDIUM — CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- CVSS 3.1 (134c704f-9b21-4f2e-91b3-4a467353bcc0)
- 5.5 MEDIUM — CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Weaknesses
- CWE-552
Description
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.
Affected configurations
• kernel util-linux (>= 2.34 < 2.37.3)
• fedoraproject fedora 35
Related
Weakness · CWE (1)
- CWE-552 Files or Directories Accessible to External Parties weakness
References
- http://packetstormsecurity.com/files/170176/snap-confine-must_mkdir_and_open_with_perms-Race-Condition.html Third Party Advisory
- http://seclists.org/fulldisclosure/2022/Dec/4 Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2022/11/30/2 Mailing List, Third Party Advisory
- https://access.redhat.com/security/cve/CVE-2021-3996 Issue Tracking, Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2024628 Issue Tracking, Patch, Third Party Advisory
- https://github.com/util-linux/util-linux/commit/166e87368ae88bf31112a30e078cceae637f4cdb Patch, Third Party Advisory
- https://mirrors.edge.kernel.org/pub/linux/utils/util-linux/v2.37/v2.37.3-ReleaseNotes Release Notes, Vendor Advisory
- https://security.gentoo.org/glsa/202401-08 security.gentoo.org
- https://security.netapp.com/advisory/ntap-20221209-0002/ Broken Link, Third Party Advisory
- https://www.openwall.com/lists/oss-security/2022/01/24/2 Exploit, Mailing List, Patch, Third Party Advisory
- http://packetstormsecurity.com/files/170176/snap-confine-must_mkdir_and_open_with_perms-Race-Condition.html Third Party Advisory
- http://seclists.org/fulldisclosure/2022/Dec/4 Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2022/11/30/2 Mailing List, Third Party Advisory
- https://access.redhat.com/security/cve/CVE-2021-3996 Issue Tracking, Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2024628 Issue Tracking, Patch, Third Party Advisory
- https://github.com/util-linux/util-linux/commit/166e87368ae88bf31112a30e078cceae637f4cdb Patch, Third Party Advisory
- https://mirrors.edge.kernel.org/pub/linux/utils/util-linux/v2.37/v2.37.3-ReleaseNotes Release Notes, Vendor Advisory
- https://security.gentoo.org/glsa/202401-08 security.gentoo.org
- https://security.netapp.com/advisory/ntap-20221209-0002/ Broken Link, Third Party Advisory
- https://www.openwall.com/lists/oss-security/2022/01/24/2 Exploit, Mailing List, Patch, Third Party Advisory