fuse: unprivileged user can unmount arbitrary locations via symlink attack
Published Sep 2, 2011
3.3
LOWCVSS 2.0
EPSS 0.33%
Description
Certain legacy functionality in fusermount in fuse 2.8.5 and earlier, when util-linux does not support the --no-canonicalize option, allows local users to bypass intended access restrictions and unmount arbitrary directories via a symlink attack.
Affected products
No data.
- ≤ 2.8.5
- 1.9
- 2.0
- 2.0
- 2.1
- 2.2
- 2.2.1
- 2.3
- 2.3
- 2.3.0
- 2.4.0
- 2.4.1
- 2.4.2
- 2.5.0
- 2.5.1
- 2.5.2
- 2.5.3
- 2.6.0
- 2.6.1
- 2.6.3
- 2.6.5
- 2.7.0
- 2.7.1
- 2.7.2
- 2.7.3
- 2.7.4
- 2.7.5
- 2.7.6
- 2.8.0
- 2.8.1
- 2.8.2
- 2.8.3
- 2.8.4
No data.
Red Hat Enterprise Linux 6
fuse-0:2.8.3-3.el6_1
Fixed · RHSA-2011:1083
Red Hat Enterprise Linux 5
fuse
Will not fix
Red Hat Enterprise Linux 5
util-linux
Will not fix
Red Hat Enterprise Linux 6
util-linux-ng
Affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 6 | fuse-0:2.8.3-3.el6_1 | Fixed | RHSA-2011:1083 |
| Red Hat Enterprise Linux 5 | fuse | Will not fix | n/a |
| Red Hat Enterprise Linux 5 | util-linux | Will not fix | n/a |
| Red Hat Enterprise Linux 6 | util-linux-ng | Affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
The Red Hat Security Response Team has rated this issue as having low security impact. On Red Hat Enterprise Linux 5 and 6, a user must be a member of the 'fuse' group in order to use FUSE. Due to the risks associated with fixing this bug on Red Hat Enterprise Linux 5, and because of the group restrictions in place, we currently have no plans to fix this flaw in Red Hat Enterprise Linux 5.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
AV:L/AC:M/Au:N/C:N/I:P/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (11 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.33% (0.00329) | 23.61th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.33% (0.00329) | 24.42th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.06% (0.00060) | 15.84th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.04% (0.00042) | 5.07th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.04% (0.00042) | 5.63th | v3 (v2023.03.01) |
| Mar 6, 2023 | 0.95% (0.00950) | 32.28th | v2 (v2022.01.01) |
| Feb 13, 2023 | 0.95% (0.00950) | 31.86th | v2 (v2022.01.01) |
| Feb 3, 2023 | 1.10% (0.01104) | 53.31th | v2 (v2022.01.01) |
| Sep 10, 2022 | 0.95% (0.00950) | 30.63th | v2 (v2022.01.01) |
| Apr 1, 2022 | 0.95% (0.00950) | 28.61th | v2 (v2022.01.01) |
| Feb 4, 2022 | 0.95% (0.00950) | 13.46th | v2 (v2022.01.01) |
References (9)
- http://fuse.git.sourceforge.net/git/gitweb.cgi?p=fuse/fuse%3Ba=commit%3Bh=cbd3a2a84068aae6e3fe32939d88470d712dbf47 x_refsource_CONFIRM
- http://lists.opensuse.org/opensuse-security-announce/2011-04/msg00000.html vendor-advisoryx_refsource_SUSE
- http://www.openwall.com/lists/oss-security/2011/02/02/2 mailing-listx_refsource_MLISTPatch
- http://www.openwall.com/lists/oss-security/2011/02/03/5 mailing-listx_refsource_MLISTPatch
- http://www.openwall.com/lists/oss-security/2011/02/08/4 mailing-listx_refsource_MLISTPatch
- https://access.redhat.com/security/cve/CVE-2011-0543 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=651183 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2011-0543
- https://www.cve.org/CVERecord?id=CVE-2011-0543
| Link | Providers | Tags |
|---|---|---|
| http://fuse.git.sourceforge.net/git/gitweb.cgi?p=fuse/fuse%3Ba=commit%3Bh=cbd3a2a84068aae6e3fe32939d88470d712dbf47 | x_refsource_CONFIRM | |
| http://lists.opensuse.org/opensuse-security-announce/2011-04/msg00000.html | vendor-advisoryx_refsource_SUSE | |
| http://www.openwall.com/lists/oss-security/2011/02/02/2 | mailing-listx_refsource_MLISTPatch | |
| http://www.openwall.com/lists/oss-security/2011/02/03/5 | mailing-listx_refsource_MLISTPatch | |
| http://www.openwall.com/lists/oss-security/2011/02/08/4 | mailing-listx_refsource_MLISTPatch | |
| https://access.redhat.com/security/cve/CVE-2011-0543 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=651183 | Issue Tracking | |
| https://nvd.nist.gov/vuln/detail/CVE-2011-0543 | ||
| https://www.cve.org/CVERecord?id=CVE-2011-0543 |
Change history (0)
No recorded changes yet.