CVE-2026-33150
Use After Free in libfuse
Description
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.
INFO
Published Date :
March 20, 2026, 9:17 p.m.
Last Modified :
March 23, 2026, 7:16 p.m.
Remotely Exploit :
No
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Update libfuse to version 3.18.2 or later.
- Apply relevant security patches to FUSE.
- Monitor for resource exhaustion scenarios.
- Limit thread creation in containerized environments.
Public PoC/Exploit Available at Github
CVE-2026-33150 has a 2 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-33150.
| URL | Resource |
|---|---|
| https://github.com/libfuse/libfuse/commit/49fcd891a58f622c098e2ca67d66086f7b213836 | Patch |
| https://github.com/libfuse/libfuse/releases/tag/fuse-3.18.2 | Product Release Notes |
| https://github.com/libfuse/libfuse/security/advisories/GHSA-qxv7-xrc2-qmfx | Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-33150 is
associated with the following CWEs:
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.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
RingWraith: CVE-2026-33150 and CVE-2026-33179 — Use-After-Free and NULL Dereference in libfuse io_uring
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📡 PoC auto collect from GitHub. ⚠️ Be careful Malware.
security cve exploit poc vulnerability
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-33150 vulnerability anywhere in the article.
-
Daily CyberSecurity
The MuPDF Vulnerability Turning “Safe” PDFs into System Hijackers
A significant security flaw has been unearthed in Artifex MuPDF, a popular framework prized for its speed and versatility in handling PDFs, XPS, and e-books. Labeled as CVE-2026-3308, this integer ove ... Read more
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Daily CyberSecurity
Critical libfuse io_uring Vulnerabilities Threaten Linux and Kubernetes Infrastructure
The FUSE (Filesystem in Userspace) project, a staple of the Linux ecosystem that allows non-privileged users to create their own file systems, is facing a dual-threat. Researchers have identified two ... Read more
The following table lists the changes that have been made to the
CVE-2026-33150 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Mar. 23, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:libfuse_project:libfuse:*:*:*:*:*:*:*:* versions from (including) 3.18.0 up to (excluding) 3.18.2 Added Reference Type GitHub, Inc.: https://github.com/libfuse/libfuse/commit/49fcd891a58f622c098e2ca67d66086f7b213836 Types: Patch Added Reference Type GitHub, Inc.: https://github.com/libfuse/libfuse/releases/tag/fuse-3.18.2 Types: Product, Release Notes Added Reference Type GitHub, Inc.: https://github.com/libfuse/libfuse/security/advisories/GHSA-qxv7-xrc2-qmfx Types: Vendor Advisory -
New CVE Received by [email protected]
Mar. 20, 2026
Action Type Old Value New Value Added Description 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. Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Added CWE CWE-416 Added Reference https://github.com/libfuse/libfuse/commit/49fcd891a58f622c098e2ca67d66086f7b213836 Added Reference https://github.com/libfuse/libfuse/releases/tag/fuse-3.18.2 Added Reference https://github.com/libfuse/libfuse/security/advisories/GHSA-qxv7-xrc2-qmfx