CVE-2026-33150libfuse is the reference implementation of the Linux FUSE.
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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.
- CVSS
- 7.8 HIGH (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-416, CWE-825
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Modified
- Record last updated
- Jul 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
libfuse_project libfuse libfuse_project:libfuse | from 3.18.0 before 3.18.2 | NVD |
References
- https://github.com/libfuse/libfuse/commit/49fcd891a58f622c098e2ca67d66086f7b213836patch
- https://github.com/libfuse/libfuse/releases/tag/fuse-3.18.2product, release-notes
- https://github.com/libfuse/libfuse/security/advisories/GHSA-qxv7-xrc2-qmfxvendor-advisory
- https://access.redhat.com/security/cve/CVE-2026-33150
- https://bugzilla.redhat.com/show_bug.cgi?id=2449771
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33150.json
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.