CVE-2026-33150

Use after free in Libfuse Project

CVSS score

7.8

EPSS probability

%0.2

Risk score

0.0

Published

7 mo ago

Overview Public Exploits (0)Newsroom Vulnerability Timeline

Official patch verified

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Vulnerability description

DayBreach CVE AI Research

CVE-2026-33150 has vendor, distribution, patch and security-source records on file. We can compare them and prepare an explanation linked to the evidence.

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 session state, leading to a use-after-free when the session shuts down. The trigger is reliable in containerized environments where cgroup pids.max limits naturally constrain thread creation. This issue has been patched in version 3.18.2.

IMPACT: Affected Products and Software

Affected Products

The following products are affected by CVE-2026-33150 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.

ID	VENDOR	PRODUCT	ACTION
1	libfuse project	libfuse	View

Total affected vendors: 1|Products: 1

RED HAT CSAF/VEX: Product Impact Check

Red Hat has not yet published a CSAF/VEX impact record for this CVE. This does not mean “not affected”.

SCORING: CVSS from Multiple Sources

CVSS Scores

The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.

SCORE	VERSION	SEVERITY	VECTOR	SOURCE
7.8	CVSS V31	HIGH	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	NVD

Patch and Remediation Guide

Solution & Remediation Advisory

Patch verified

2 doğrulanmış yama veya düzeltilmiş sürüm kanıtı bulundu.

nvd

NVD tarafından Patch olarak etiketlenmiş referans

Open source

reference

Yama veya çözüm referansı

Open source

Confirm the affected product and version against the source evidence above.

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Apply the official update named in the evidence only to the matching product and version.

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Public exploit and active exploitation status

Verified exploit intelligence

No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.

Weakness Classification and Attack Patterns (CWE & CAPEC)

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-33150 is associated with the following CWEs:

CWE-416: Use After Free CWE-825: Common Weakness Enumeration Entry CWE-825

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-33150 weaknesses.

CAPEC-66: SQL Injection CAPEC-126: Path Traversal CAPEC-28: OS Command Injection

Attack Vector and Accessibility

ExposureYerel erişim

PermissionsLow

UserGerekmiyor

Official Sources and Advisories

https://github.com/libfuse/libfuse/commit/49fcd891a58f622c098e2ca67d66086f7b213836patch https://github.com/libfuse/libfuse/releases/tag/fuse-3.18.2nvd https://github.com/libfuse/libfuse/security/advisories/GHSA-qxv7-xrc2-qmfxvendor-advisory https://access.redhat.com/security/cve/CVE-2026-33150nvd https://bugzilla.redhat.com/show_bug.cgi?id=2449771nvd https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33150.jsonnvd

CVSS Vector Radar Chart

7.8 / 10

Vulnerability Scoring Details

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredLow privileges

User InteractionNone required

Confidentiality (Gizlilik)Low

Integrity (Bütünlük)None

Availability (Erişilebilirlik)High

Yama doğrulandı

2 doğrulanmış yama veya düzeltilmiş sürüm kanıtı bulundu.

Follow the vendor

libfuse project

Weakness Type (CWE & CAPEC)

CWE-416 CWE-825

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