CVE-2026-33150— Use After Free in libfuse
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I. Basic Information for CVE-2026-33150
Vulnerability Information
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Vulnerability Title
Use After Free in libfuse
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
释放后使用
Source: NVD (National Vulnerability Database)
Vulnerability Title
libfuse 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
libfuse是libfuse开源的一个用户空间文件系统开发库。 libfuse 3.18.0至3.18.2之前版本存在资源管理错误漏洞，该漏洞源于io_uring子系统存在释放后重用问题，可能导致本地攻击者使FUSE文件系统进程崩溃或执行任意代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-33150
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- Release fuse-3.18.2 · libfuse/libfuse · GitHubx_refsource_MISC
- Use After Free in libfuse · Advisory · libfuse/libfuse · GitHubx_refsource_CONFIRM
- https://nvd.nist.gov/vuln/detail/CVE-2026-33150
IV. Related Vulnerabilities
V. Comments for CVE-2026-33150
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