{"id":"CVE-2026-33150","summary":"Use After Free in libfuse","details":"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.","aliases":["GHSA-qxv7-xrc2-qmfx"],"modified":"2026-08-12T15:32:36.454845Z","published":"2026-03-20T20:20:29.963Z","database_specific":{"cwe_ids":["CWE-416"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33150.json","cna_assigner":"GitHub_M"},"references":[{"type":"WEB","url":"https://github.com/libfuse/libfuse/releases/tag/fuse-3.18.2"},{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33150.json"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2026-33150"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33150.json"},{"type":"ADVISORY","url":"https://github.com/libfuse/libfuse/security/advisories/GHSA-qxv7-xrc2-qmfx"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-33150"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2449771"},{"type":"FIX","url":"https://github.com/libfuse/libfuse/commit/49fcd891a58f622c098e2ca67d66086f7b213836"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/libfuse/libfuse","events":[{"introduced":"9157d99f17384f362c65b02cec065e0aec5f0b56"},{"fixed":"033844748010a3b8265bf1c90b9ae8ffe4cd9ca7"},{"fixed":"49fcd891a58f622c098e2ca67d66086f7b213836"}],"database_specific":{"cpe":"cpe:2.3:a:libfuse_project:libfuse:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"3.18.0"},{"fixed":"3.18.2"}],"source":["CPE_RANGE","REFERENCES"]}}],"versions":["fuse-3.18.1","fuse-3.18.0"],"database_specific":{"vanir_signatures_modified":"2026-08-12T15:32:36Z","vanir_signatures":[{"deprecated":false,"digest":{"line_hashes":["299934566000463084493258070924523487637","110030752691638793047042537792243545334","146088484175563655392658876407671317044","227170435765217123882477481264954327236","111523425814923684263911035124315833850"],"threshold":0.9},"id":"CVE-2026-33150-740b10bb","signature_type":"Line","signature_version":"v1","source":"https://github.com/libfuse/libfuse/commit/49fcd891a58f622c098e2ca67d66086f7b213836","target":{"file":"lib/fuse_uring.c"}},{"deprecated":false,"digest":{"function_hash":"191538989541291180850150979726671951433","length":740},"id":"CVE-2026-33150-d198a3cf","signature_type":"Function","signature_version":"v1","source":"https://github.com/libfuse/libfuse/commit/49fcd891a58f622c098e2ca67d66086f7b213836","target":{"file":"lib/fuse_uring.c","function":"fuse_uring_start"}}],"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-33150.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}