{"id":"CVE-2026-33179","summary":"libfuse: NULL Pointer Dereference and Memory Leak in io_uring Queue Initialization","details":"libfuse is the reference implementation of the Linux FUSE. From version 3.18.0 to before version 3.18.2, a NULL pointer dereference and memory leak in fuse_uring_init_queue allows a local user to crash the FUSE daemon or cause resource exhaustion. When numa_alloc_local fails during io_uring queue entry setup, the code proceeds with NULL pointers. When fuse_uring_register_queue fails, NUMA allocations are leaked and the function incorrectly returns success. Only the io_uring transport is affected; the traditional /dev/fuse path is not affected. PoC confirmed with AddressSanitizer/LeakSanitizer. This issue has been patched in version 3.18.2.","aliases":["GHSA-x669-v3mq-r358"],"modified":"2026-08-12T16:24:59.589867Z","published":"2026-03-20T20:20:09.171Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33179.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-476"]},"references":[{"type":"WEB","url":"https://github.com/libfuse/libfuse/releases/tag/fuse-3.18.2"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33179.json"},{"type":"ADVISORY","url":"https://github.com/libfuse/libfuse/security/advisories/GHSA-x669-v3mq-r358"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-33179"},{"type":"FIX","url":"https://github.com/libfuse/libfuse/commit/7beb86c09b6ec5aab14dc25256ed8a5ad18554d7"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/libfuse/libfuse","events":[{"introduced":"9157d99f17384f362c65b02cec065e0aec5f0b56"},{"fixed":"033844748010a3b8265bf1c90b9ae8ffe4cd9ca7"},{"fixed":"7beb86c09b6ec5aab14dc25256ed8a5ad18554d7"}],"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":"2026-08-12T16:24:59Z","vanir_signatures":[{"digest":{"line_hashes":["75977283550067020594867427944851710787","242814262310782443461044355328779254174","139672689152158501098938653034549030173","278672793934297416002172161223663597488","99466266978574180537848959021460125129","305607712564675670795062131891010338686","72269352681920775068225450362949887651","7794636113338527503519058360333239973","218511156005334730634936337892891239174","114826023669734828939655044444949837068","21066314308945535210215845796032284668","7814644184218551022983333203084819157","13751028219245248511333246120086474626","129600244970657786892666256424891254944","253471420929995539705318326009632631552","323680958995263598172998626989660282133","117092153249769120832172686002022036254","203816501181722737527141644812894054117","26655532460159371695403089893070149913","103714928727374273246763356745166529718"],"threshold":0.9},"id":"CVE-2026-33179-61d3e087","signature_type":"Line","signature_version":"v1","source":"https://github.com/libfuse/libfuse/commit/7beb86c09b6ec5aab14dc25256ed8a5ad18554d7","target":{"file":"lib/fuse_uring.c"},"deprecated":false},{"signature_version":"v1","source":"https://github.com/libfuse/libfuse/commit/7beb86c09b6ec5aab14dc25256ed8a5ad18554d7","target":{"file":"lib/fuse_uring.c","function":"fuse_uring_init_queue"},"deprecated":false,"digest":{"function_hash":"21454303844879228291835969492047356552","length":1363},"id":"CVE-2026-33179-bf29f9f2","signature_type":"Function"}],"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-33179.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:N/I:N/A:H"}]}