{"api_version":"1","generated_at":"2026-08-19T11:45:09+00:00","cve":"CVE-2026-49430","urls":{"html":"https://cve.report/CVE-2026-49430","api":"https://cve.report/api/cve/CVE-2026-49430.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-49430","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-49430"},"summary":{"title":"Kernel heap overflow in ZFS_IOC_RECV_NEW ioctl","description":"The ZFS_IOC_RECV_NEW ioctl, in the heal receive path, similarly truncated a 64-bit payload size to a 32-bit integer for allocation, then used the original 64-bit size as the length for a byteswap operation.\n\nA local user with the \"receive\" delegated ZFS permission can trigger kernel memory corruption via ZFS_IOC_RECV_NEW by sending a crafted receive stream in heal mode.","state":"PUBLISHED","assigner":"freebsd","published_at":"2026-08-19 06:17:42","updated_at":"2026-08-19 06:17:42"},"problem_types":["CWE-122","CWE-122 CWE-122: Heap-based Buffer 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Yang, Yizhou Zhao, Ao Wang, Xuewei Feng, Qi Li, and Ke Xu from Tsinghua University using GLM-5.1 from Z.ai"},{"lang":"en","type":"finder","value":"Emmanuel Genier at Quarkslab"}],"datePublic":"2026-06-30T20:00:00.000Z","descriptions":[{"lang":"en","value":"The ZFS_IOC_RECV_NEW ioctl, in the heal receive path, similarly truncated a 64-bit payload size to a 32-bit integer for allocation, then used the original 64-bit size as the length for a byteswap operation.\n\nA local user with the \"receive\" delegated ZFS permission can trigger kernel memory corruption via ZFS_IOC_RECV_NEW by sending a crafted receive stream in heal mode."}],"problemTypes":[{"descriptions":[{"cweId":"CWE-122","description":"CWE-122: Heap-based Buffer 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in ZFS_IOC_RECV_NEW ioctl","CVE":"CVE-2026-49430","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"49430","Ordinal":"1","NoteData":"The ZFS_IOC_RECV_NEW ioctl, in the heal receive path, similarly truncated a 64-bit payload size to a 32-bit integer for allocation, then used the original 64-bit size as the length for a byteswap operation.\n\nA local user with the \"receive\" delegated ZFS permission can trigger kernel memory corruption via ZFS_IOC_RECV_NEW by sending a crafted receive stream in heal mode.","Type":"Description","Title":"Kernel heap overflow in ZFS_IOC_RECV_NEW ioctl"}]}}}