CVE-2026-33179: libfuse is the reference implementation of the Linux FUSE

Routine

MEDIUM 5.5WATCHLISTUPGRADE

CVE-2026-33179 is a medium-severity flaw (CVSS 5.5) affecting libfuse. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

libfuse is the reference implementation of the Linux FUSE. From version 3.18.0 to before version 3.18.2, a NULL pointer dereference and memory leak in fuse_uring_init_queue allows a local user to crash the FUSE daemon or cause resource exhaustion. When numa_alloc_local fails during io_uring queue entry setup, the code proceeds with NULL pointers. When fuse_uring_register_queue fails, NUMA allocations are leaked and the function incorrectly return

Why this priority

On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 90%)
CISA exploited list	No
Weakness	CWE-476
Published	2026-03-20
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: libfuse project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-20 21:17 UTCPublished CVE record published
2026-06-17 10:37 UTCUpdated Record last modified

libfuse project libfuse UPGRADE

Affected: >= 3.18.0 and < 3.18.2

Fixed in: 3.18.2

Safe to downgrade to: a release before 3.18.0

1. Check installed version

apt-cache policy libfuse || rpm -q libfuse || libfuse --version

2. UPGRADE to 3.18.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade libfuse

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade libfuse

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 3.18.0 (Debian / Ubuntu)

apt-cache madison libfuse sudo apt install libfuse=<VERSION_BEFORE_3.18.0> sudo apt-mark hold libfuse

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list libfuse sudo dnf downgrade libfuse-<VERSION_BEFORE_3.18.0> sudo dnf versionlock add libfuse

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-33179?

libfuse: upgrade to 3.18.2. Exact commands for each OS are on this page.

Is CVE-2026-33179 being exploited?

CVE-2026-33179 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-33179 affect?

CVE-2026-33179 affects libfuse. Severity is medium (CVSS 5.5). libfuse is the reference implementation of the Linux FUSE. From version 3.18.0 to before version 3.18.2, a NULL pointer dereference and memory leak in fuse_uring_init_queue allows a local user to crash the FUSE daemon or cause resource exha

How urgent is CVE-2026-33179?

Priority 27/100. On your watchlist

Related CVEs

CVE-2026-33150 HIGH 7.8 UPGRADE libfuse is the reference implementation of the Linux FUSE

References

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