Description
fusermount in fuse 2.8.5 and earlier does not perform a chdir to / before performing a mount or umount, which allows local users to unmount arbitrary directories via unspecified vectors.
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 |
Advisories 1
- RHSA-2011:1083 Red Hat Security Advisory: fuse security update Red Hat Security Advisories (RHSA) · Jan 14, 2026