CVEvulnerability
CVE-2026-33150
7.8 HIGH
Official page ↗
- Status
- Modified
- Published
- 2026-03-20
- Last modified
- 2026-07-15
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 7.8 HIGH — CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CVSS 3.1 (0b0ca135-0b70-47e7-9f44-1890c2a1c46c)
- 7.8 HIGH — CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weaknesses
- CWE-416, CWE-825
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.
Affected configurations
• libfuse project libfuse (>= 3.18.0 < 3.18.2)
Related
References
- 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
- https://access.redhat.com/security/cve/CVE-2026-33150 access.redhat.com
- https://bugzilla.redhat.com/show_bug.cgi?id=2449771 bugzilla.redhat.com
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33150.json security.access.redhat.com