CVE-2026-33150: libfuse is the reference implementation of the Linux FUSE

Routine

HIGH 7.8WATCHLISTUPGRADE

CVE-2026-33150 is a high-severity flaw (CVSS 7.8) 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 use-after-free vulnerability in the io_uring subsystem of libfuse allows a local attacker to crash FUSE filesystem processes and potentially execute arbitrary code. When io_uring thread creation fails due to resource exhaustion (e.g., cgroup pids.max), fuse_uring_start() frees the ring pool structure but stores the dangling pointer in the se

Why this priority

High severity
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 76%)
CISA exploited list	No
Weakness	CWE-416, CWE-825
Published	2026-03-20
Last modified	2026-07-15

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

Last updated 2026-07-15 · 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
2026-07-15 02:20 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-2026-33150?

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

Is CVE-2026-33150 being exploited?

CVE-2026-33150 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-2026-33150 affect?

CVE-2026-33150 affects libfuse. Severity is high (CVSS 7.8). libfuse is the reference implementation of the Linux FUSE. From version 3.18.0 to before version 3.18.2, a use-after-free vulnerability in the io_uring subsystem of libfuse allows a local attacker to crash FUSE filesystem processes and pote

How urgent is CVE-2026-33150?

Priority 38/100. High severity; On your watchlist

Related CVEs

CVE-2026-33179 MEDIUM 5.5 UPGRADE libfuse is the reference implementation of the Linux FUSE

References

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