Description
fusermount in FUSE before 2.7.5, and 2.8.x before 2.8.2, allows local users to unmount an arbitrary FUSE filesystem share via a symlink attack on a mountpoint.
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 | 2.8.1-1.2 | — |
| Debian 12 | fuse | 2.8.1-1.2 | — |
| Debian 5.0 | fuse | 2.7.4-1.1+lenny1 | DSA-1989-1 |
| Debian 4.0 | fuse | 2.5.3-4.4+etch1 | DSA-1989-1 |
Advisories 1
- DSA-1989-1 fuse - denial of service Debian Security (DSA / DLA) · Mar 9, 2026
References
- http://sourceforge.net/projects/fuse/files/ReleaseNotes/fuse-2.8.3.html/view
- FEDORA-2010-1159 vendor-advisory
- http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=567633
- ADV-2010-1107 vdb-entry
- DSA-1989 vendor-advisory
- fuse-fusermount-dos(55945) vdb-entry
- https://bugzilla.redhat.com/show_bug.cgi?id=558833
- SUSE-SR:2010:011 vendor-advisory
- SUSE-SR:2010:013 vendor-advisory
- 38261 third-party-advisory
- SUSE-SR:2010:003 vendor-advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=532940
- 38359 third-party-advisory
- 38287 third-party-advisory
- 38437 third-party-advisory
- USN-892-1 vendor-advisory
- http://sourceforge.net/projects/fuse/files/fuse-2.X/2.7.5/fuse-2.7.5.tar.gz/download
- 37983 vdb-entry
- FEDORA-2010-1140 vendor-advisory