{"id":"CVE-2026-33179","state":"PUBLISHED","title":"libfuse: NULL Pointer Dereference and Memory Leak in io_uring Queue Initialization","description":"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.","publishedAt":"2026-03-20T20:20:09.171Z","updatedAt":"2026-03-25T13:55:45.971Z","severity":{"score":5.5,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","source":"GitHub_M"},"assigner":"GitHub_M","products":["libfuse libfuse"],"affected":[{"vendor":"libfuse","product":"libfuse","versions":[{"version":">= 3.18.0, < 3.18.2","status":"affected"}]}],"references":["https://github.com/libfuse/libfuse/security/advisories/GHSA-x669-v3mq-r358","https://github.com/libfuse/libfuse/commit/7beb86c09b6ec5aab14dc25256ed8a5ad18554d7","https://github.com/libfuse/libfuse/releases/tag/fuse-3.18.2"],"weaknesses":["CWE-476"],"ingestedAt":"2026-10-29T20:11:40.391Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/33xxx/CVE-2026-33179.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-33179","state":"PUBLISHED","datePublished":"2026-03-20T20:20:09.171Z","dateUpdated":"2026-03-25T13:55:45.971Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-03-17T22:16:36.720Z"},"containers":{"cna":{"title":"libfuse: NULL Pointer Dereference and Memory Leak in io_uring Queue Initialization","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"libfuse","product":"libfuse","versions":[{"version":">= 3.18.0, < 3.18.2","status":"affected"}]}],"references":[{"url":"https://github.com/libfuse/libfuse/security/advisories/GHSA-x669-v3mq-r358","name":"https://github.com/libfuse/libfuse/security/advisories/GHSA-x669-v3mq-r358","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/libfuse/libfuse/commit/7beb86c09b6ec5aab14dc25256ed8a5ad18554d7","name":"https://github.com/libfuse/libfuse/commit/7beb86c09b6ec5aab14dc25256ed8a5ad18554d7","tags":["x_refsource_MISC"]},{"url":"https://github.com/libfuse/libfuse/releases/tag/fuse-3.18.2","name":"https://github.com/libfuse/libfuse/releases/tag/fuse-3.18.2","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"HIGH","baseScore":5.5,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-476","lang":"en","description":"CWE-476: NULL Pointer Dereference","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-03-20T20:20:09.171Z"},"source":{"advisory":"GHSA-x669-v3mq-r358","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-03-25T13:55:38.887586Z","id":"CVE-2026-33179","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-03-25T13:55:45.971Z"}}]}}}