{"id":"UBUNTU-CVE-2026-33179","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.","modified":"2026-05-20T16:12:46.935336541Z","published":"2026-03-20T21:17:00Z","upstream":["CVE-2026-33179"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-33179"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-33179"},{"type":"REPORT","url":"https://github.com/libfuse/libfuse/releases/tag/fuse-3.18.2"},{"type":"REPORT","url":"https://github.com/libfuse/libfuse/security/advisories/GHSA-x669-v3mq-r358"}],"affected":[{"package":{"name":"fuse3","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/fuse3?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.17.4-1","3.18.1-1","3.18.2-1"],"ecosystem_specific":{"binaries":[{"binary_version":"3.18.2-1","binary_name":"fuse"},{"binary_version":"3.18.2-1","binary_name":"fuse3"},{"binary_version":"3.18.2-1","binary_name":"libfuse3-4"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33179.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}