CVE-2026-33150
Use After Free in libfuse
- State
- Published
- Severity
- 7.8 High
- Published
- Mar 20, 2026
- Updated
- Jul 15, 2026
- Reserved
- Mar 17, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 7.8 High | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | GitHub_M |
| 3.1 | 7.8 High | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | redhat-SADP |
Weaknesses
Affected Products
| Product | Versions |
|---|---|
libfuselibfuse |
|
References
- https://github.com/libfuse/libfuse/security/advisories/GHSA-qxv7-xrc2-qmfx
- https://github.com/libfuse/libfuse/commit/49fcd891a58f622c098e2ca67d66086f7b213836
- https://github.com/libfuse/libfuse/releases/tag/fuse-3.18.2
- https://access.redhat.com/security/cve/CVE-2026-33150vdb-entry
- RHBZ#2449771issue-tracking
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33150.json
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