CVE-2026-33150Disclosure(libfuse_project / libfuse)

LOWCVSS 7.8 · HIGH

Exploit discussion active in current signal (1 latest mentions)

Immediate actions

Patch libfuse_project libfuse systems immediately
Hunt for exploitation attempts and persistence artifacts
Increase monitoring for publicly documented tradecraft

Recommended action window: High priority (within 72h)

NVD 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.

libfuse_project CVEs Back to dashboard

2.0/ 10 priority

Sources & remediation

Patch / fix

https://github.com/libfuse/libfuse/commit/49fcd891a58f622c098e2ca67d66086f7b213836

Vendor / third-party advisories

https://github.com/libfuse/libfuse/security/advisories/GHSA-qxv7-xrc2-qmfx

Other references

Weakness type (CWE)

CWE-416CWE-825

Priority

LOW

Exploitation

NONE

PoC

YES

Patch

AVAILABLE

Momentum

STABLE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

libfuse

Threat summary

Public PoC is present in monitored signal
Patch or workaround signal is available
6 mentions across 4 observed days
Momentum state: stable

What's happening

PoC mentioned or linked in 2 signals
Patch or workaround mentioned in 2 signals
Technical details provided in 6 signals
Disclosure: 3 classified signals
Peaked 3d ago at 2 mentions (2026-03-21); latest day: 1
6 total mentions across 4 days

Affected systems

Vendors

libfuse_project

Products

libfuse

Deep dive

Activity timeline6 mentions / 4d

Signal classification3 categories

Disclosure

350.0%

PoC

233.3%

Patch

116.7%

Referenced assets4 URLs

By indicator

Classification over time

Date	Total	Labels

2026-03-21	2	Disclosure2
2026-03-24	2	PoC2
2026-03-30	1	Patch1
2026-03-31	1	Disclosure1

Full discourse6 posts

Open Source Security mailing list@oss_security202d
Disclosure
libfuse: io_uring memory safety vulnerabilities https://www.openwall.com/lists/oss-security/2026/03/21/2 Affected versions: libfuse >= 3.18.0, < 3.18.2 Fixed in: libfuse 3.18.2 CVE-2026-33150: Use-After-Free CVE-2026-33179: NULL Pointer Dereference + Memory Leak
Post summary
The note announces two libfuse memory‑safety CVEs (Use-After-Free and NULL pointer dereference), lists affected and fixed versions, and confirms a patch, with no PoC or exploitation details.
0501171.8K
4.4K followersView on X
Gray Hats@the_yellow_fall193d
Patch
Researchers uncover two flaws in libfuse's io_uring transport (CVE-2026-33150 & 33179). Impacting Kubernetes CSI drivers, these bugs allow RCE and DoS. Patch now! #libfuse #LinuxSecurity #CyberSecurity #Kubernetes #io_uring #CVE #InfoSec #CloudSecurity https://securityonline.info/libfuse-io-uring-vulnerabilities-cve-2026-33150-cve-2026-33179/ https://t.co/meyHCKpXto
Post summary
Researchers discovered RCE and DoS vulnerabilities in libfuse’s io_uring transport affecting Kubernetes CSI drivers; patches have been released to mitigate the issue.
031111562
12.3K followersView on X
CSIRT Italia@csirt_it199d
PoC
‼️ #Libfuse: disponibile #PoC per lo sfruttamento delle CVE-2026-33150 e CVE-2026-33179 Rischio: 🔴 Tipologia: 🔸 Arbitrary Code Execution 🔸 Privilege Escalation 🔸 Denial of Service 🔗 https://www.acn.gov.it/portale/w/libfuse-disponibile-poc-per-lo-sfruttamento-delle-cve-2026-33150-e-cve-2026-33179 🔄 Aggiornamenti disponibili 🔄 https://t.co/LmbQh1oLhD
Post summary
The post confirms a proof‑of‑concept for the two Libfuse CVEs is available, indicating potential arbitrary code execution, privilege escalation, and denial‑of‑service, but no exploit code or patches are mentioned.
01050192
8.8K followersView on X
kinneko@kinneko192d
Disclosure
Critical libfuse io_uring Vulnerabilities Threaten Linux and Kubernetes Infrastructure https://securityonline.info/libfuse-io-uring-vulnerabilities-cve-2026-33150-cve-2026-33179/
Post summary
The article announces critical libfuse io_uring vulnerabilities (CVE‑2026‑33150 and CVE‑2026‑33179) that could threaten Linux and Kubernetes infrastructure.
00002119
2.8K followersView on X
CVE@CVEnew202d
Disclosure
CVE-2026-33150 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 l… https://www.cve.org/CVERecord?id=CVE-2026-33150
Post summary
The text announces CVE‑2026‑33150 as a use‑after‑free flaw in libfuse’s io_uring subsystem affecting versions 3.18.0 to 3.18.1.
01010164
56.8K followersView on X
Hephaestvs@Vulcanux_199d
PoC
csirt_it: ‼️ #Libfuse: disponibile #PoC per lo sfruttamento delle CVE-2026-33150 e CVE-2026-33179 Rischio: 🔴 Tipologia: 🔸 Arbitrary Code Execution 🔸 Privilege Escalation 🔸 Denial of Service 🔗 https://www.acn.gov.it/portale/w/libfuse-disponibile-poc-per-lo-sfruttamento-delle-cve-2026-33150-e-cve-2026-33179 🔄 Aggiornamenti disponibi… https://t.co/STp5RX5LUP
Post summary
The tweet announces the availability of a Proof‑of‑Concept for CVE‑2026‑33150 and CVE‑2026‑33179 affecting libfuse, noting the vulnerabilities include arbitrary code execution, privilege escalation, and denial of service.
0000056
607 followersView on X

CPE platform detail1 entries

Part:

Vendor:

Product:

Version:

Target SW:

Target HW:

1 of 1 entries

Part	Vendor	Product	Version	Target SW	Target HW
App	libfuse_project	libfuse	-	-	-

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What researchers are saying

CVE-2026-33150

Open Source Security mailing list@oss_securityDisclosure

The note announces two libfuse memory‑safety CVEs (Use-After-Free and NULL pointer dereference), lists affected and fixed versions, and confirms a patch, with no PoC or exploitation details.

Gray Hats@the_yellow_fallPatch

Researchers discovered RCE and DoS vulnerabilities in libfuse’s io_uring transport affecting Kubernetes CSI drivers; patches have been released to mitigate the issue.

CSIRT Italia@csirt_itPoC

The post confirms a proof‑of‑concept for the two Libfuse CVEs is available, indicating potential arbitrary code execution, privilege escalation, and denial‑of‑service, but no exploit code or patches are mentioned.

kinneko@kinnekoDisclosure

The article announces critical libfuse io_uring vulnerabilities (CVE‑2026‑33150 and CVE‑2026‑33179) that could threaten Linux and Kubernetes infrastructure.

CVE@CVEnewDisclosure

The text announces CVE‑2026‑33150 as a use‑after‑free flaw in libfuse’s io_uring subsystem affecting versions 3.18.0 to 3.18.1.

Hephaestvs@Vulcanux_PoC

The tweet announces the availability of a Proof‑of‑Concept for CVE‑2026‑33150 and CVE‑2026‑33179 affecting libfuse, noting the vulnerabilities include arbitrary code execution, privilege escalation, and denial of service.