Description
FUSE, possibly 2.8.5 and earlier, allows local users to create mtab entries with arbitrary pathnames, and consequently unmount any filesystem, via a symlink attack on the parent directory of the mountpoint of a FUSE filesystem, a different vulnerability than CVE-2010-0789.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 13 | fuse | 2.8.5-1 | — |
| Debian 12 | fuse | 2.8.5-1 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 6 | fuse +2 | 2.8.3-3.el6_1 | RHSA-2011:1083 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Exploit-DB 1
- FUSE fusermount Tool - Race Condition EDB-34953 · dos · Nov 2, 2010 · verified
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 1
- RHSA-2011:1083 Red Hat Security Advisory: fuse security update Red Hat Security Advisories (RHSA) · Jan 14, 2026
References
- http://www.halfdog.net/Security/FuseTimerace/
- USN-1045-1 vendor-advisory
- 42965 third-party-advisory
- fuse-fusermount-tool-dos(62986) vdb-entry
- 20101102 fusermount: Unmount any filesystem mailing-list
- [oss-security] 20101104 CVE request: fuse mailing-list
- ADV-2011-0302 vdb-entry
- https://bugzilla.novell.com/show_bug.cgi?id=651598
- ADV-2011-0181 vdb-entry
- SUSE-SR:2011:005 vendor-advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=651183
- 42961 third-party-advisory
- https://bugs.launchpad.net/bugs/670622
- http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=602333
- 44623 vdb-entry
- [oss-security] 20101105 Re: CVE request: fuse mailing-list
- USN-1045-2 vendor-advisory
- FEDORA-2011-0854 vendor-advisory
- 70520 vdb-entry
- MDVSA-2013:155 vendor-advisory