{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-33179", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-03-17T22:16:36.720Z", "datePublished": "2026-03-20T20:20:09.171Z", "dateUpdated": "2026-03-25T13:55:45.971Z"}, "containers": {"cna": {"title": "libfuse: NULL Pointer Dereference and Memory Leak in io_uring Queue Initialization", "problemTypes": [{"descriptions": [{"cweId": "CWE-476", "lang": "en", "description": "CWE-476: NULL Pointer Dereference", "type": "CWE"}]}], "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"}}], "references": [{"name": "https://github.com/libfuse/libfuse/security/advisories/GHSA-x669-v3mq-r358", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/libfuse/libfuse/security/advisories/GHSA-x669-v3mq-r358"}, {"name": "https://github.com/libfuse/libfuse/commit/7beb86c09b6ec5aab14dc25256ed8a5ad18554d7", "tags": ["x_refsource_MISC"], "url": "https://github.com/libfuse/libfuse/commit/7beb86c09b6ec5aab14dc25256ed8a5ad18554d7"}, {"name": "https://github.com/libfuse/libfuse/releases/tag/fuse-3.18.2", "tags": ["x_refsource_MISC"], "url": "https://github.com/libfuse/libfuse/releases/tag/fuse-3.18.2"}], "affected": [{"vendor": "libfuse", "product": "libfuse", "versions": [{"version": ">= 3.18.0, < 3.18.2", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-03-20T20:20:09.171Z"}, "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."}], "source": {"advisory": "GHSA-x669-v3mq-r358", "discovery": "UNKNOWN"}}, "adp": [{"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"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-03-25T13:55:45.971Z"}}]}}

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{"cveTags": [], "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."}], "id": "CVE-2026-33179", "lastModified": "2026-03-23T14:32:02.800", "metrics": {"cvssMetricV31": [{"cvssData": {"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"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-03-20T21:17:16.593", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/libfuse/libfuse/commit/7beb86c09b6ec5aab14dc25256ed8a5ad18554d7"}, {"source": "security-advisories@github.com", "url": "https://github.com/libfuse/libfuse/releases/tag/fuse-3.18.2"}, {"source": "security-advisories@github.com", "url": "https://github.com/libfuse/libfuse/security/advisories/GHSA-x669-v3mq-r358"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{"bugzilla": {"description": "libfuse: libfuse: Denial of Service via NULL pointer dereference and memory leak", "id": "2449775", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2449775"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-476", "details": ["A flaw was found in libfuse. A local user can exploit a NULL pointer dereference and memory leak vulnerability during the setup of the `io_uring` input/output mechanism. This can occur when memory allocation or queue registration fails, leading to the FUSE daemon crashing or resource exhaustion. This vulnerability results in a Denial of Service (DoS)."], "name": "CVE-2026-33179", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "fuse", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "fuse-sshfs", "product_name": "Red Hat Enterprise Linux 8"}], "public_date": "2026-03-20T20:20:09Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-33179\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-33179\nhttps://github.com/libfuse/libfuse/commit/7beb86c09b6ec5aab14dc25256ed8a5ad18554d7\nhttps://github.com/libfuse/libfuse/releases/tag/fuse-3.18.2\nhttps://github.com/libfuse/libfuse/security/advisories/GHSA-x669-v3mq-r358"], "threat_severity": "Moderate"}