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CVE-2011-0541· NVD / CVE Program· CNA redhat

fuse 2.8.5 and earlier does not properly handle when /etc/mtab cannot be updated, which allows local users to unmount arbitrary directories

fuse 2.8.5 and earlier does not properly handle when /etc/mtab cannot be updated, which allows local users to unmount arbitrary directories via a symlink attack.

LowCVSS 3.3 · v2.0—No exploit Fix available

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Published
Sep 2, 2011
Updated
Jun 16, 2026
EPSS
0.3% · 23th percentile
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Report tools

JSON

Action score

13

Monitor

Low priority for now.

CVSS
13 / 40 · 3.3 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.3%

Affected systems

VendorProduct
fusefuse

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • fuse fuseup to 2.8.5 inclusive
  • fuse fuse1.9
  • fuse fuse2.0
  • fuse fuse2.1
  • fuse fuse2.2
  • fuse fuse2.2.1
  • fuse fuse2.3
  • fuse fuse2.3.0
  • fuse fuse2.4.0
  • fuse fuse2.4.1
  • fuse fuse2.4.2
  • fuse fuse2.5.0
  • fuse fuse2.5.1
  • fuse fuse2.5.2
  • fuse fuse2.5.3
  • fuse fuse2.6.0
  • fuse fuse2.6.1
  • fuse fuse2.6.3
  • fuse fuse2.6.5
  • fuse fuse2.7.0

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12fusebefore 2.8.5-12.8.5-1
openSUSE:Tumbleweedfusebefore 2.9.5-1.62.9.5-1.6
Red Hat:enterprise_linux:6::serverfusebefore 0:2.8.3-3.el6_10:2.8.3-3.el6_1
Red Hat:enterprise_linux:6::serverfuse-debuginfobefore 0:2.8.3-3.el6_10:2.8.3-3.el6_1
Red Hat:enterprise_linux:6::serverfuse-develbefore 0:2.8.3-3.el6_10:2.8.3-3.el6_1
Red Hat:enterprise_linux:6::serverfuse-libsbefore 0:2.8.3-3.el6_10:2.8.3-3.el6_1

Same product

fuse: all records

Other highest-scoring records for the same primary product.

  • CVE-2011-0543Certain legacy functionality in fusermount in fuse 2.8.5 and earlier, when util-linux does not support the --no-canonicalize option, allows
    13Monitor
  • CVE-2011-0542fusermount 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
    13Monitor
  • CVE-2010-0789fusermount 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 atta
    13Monitor
  • CVE-2005-1858FUSE 2.x before 2.3.0 does not properly clear previously used memory from unfilled pages when the filesystem returns a short byte count to a
    8Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:fuse2.8.5-1 · Debian:12Package registry (OSV)
opensuse:fuse2.9.5-1.6 · openSUSE:TumbleweedPackage registry (OSV)
red hat:fuse0:2.8.3-3.el6_1 · Red Hat:enterprise_linux:6::serverPackage registry (OSV)
red hat:fuse-debuginfo0:2.8.3-3.el6_1 · Red Hat:enterprise_linux:6::serverPackage registry (OSV)
red hat:fuse-devel0:2.8.3-3.el6_1 · Red Hat:enterprise_linux:6::serverPackage registry (OSV)
red hat:fuse-libs0:2.8.3-3.el6_1 · Red Hat:enterprise_linux:6::serverPackage registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

    If successful

    Confidentiality
    none
    Integrity
    P · data or configuration can be modified
    Availability
    P · the service can be disrupted
    Attack complexity
    M
    Confidentiality impact
    None
    Integrity impact
    P
    Availability impact
    P

    Weakness class (CWE)

    CWE-59 · Improper Link Resolution Before File Access ('Link Following')

    CVSS vector

    AV:L/AC:M/Au:N/C:N/I:P/A:P

    nvd-primary

    Attack context

    MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

    Change log

    1. Fix✗ → ✓

    For records you follow, these changes also arrive as notifications. →

    References

    Vendor advisories and official records. Exploit/PoC links are deliberately left out.

    All records