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In other words, a non-NULL sk_reuseport_cb\ndoes not imply a non-refcounted socket.\n\nDrop sk's reference in both error paths.\n\nunreferenced object 0xffff888101911800 (size 2048):\n  comm \"test_progs\", pid 44109, jiffies 4297131437\n  hex dump (first 32 bytes):\n    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n    80 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n  backtrace (crc 9336483b):\n    __kmalloc_noprof+0x3bf/0x560\n    __reuseport_alloc+0x1d/0x40\n    reuseport_alloc+0xca/0x150\n    reuseport_attach_prog+0x87/0x140\n    sk_reuseport_attach_bpf+0xc8/0x100\n    sk_setsockopt+0x1181/0x1990\n    do_sock_setsockopt+0x12b/0x160\n    __sys_setsockopt+0x7b/0xc0\n    __x64_sys_setsockopt+0x1b/0x30\n    do_syscall_64+0x93/0x180\n    entry_SYSCALL_64_after_hwframe+0x76/0x7e","state":"PUBLISHED","assigner":"Linux","published_at":"2025-01-31 12:15:29","updated_at":"2026-05-12 13:16:31"},"problem_types":["CWE-401","CWE-401 CWE-401 Missing Release 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In other words, a non-NULL sk_reuseport_cb\ndoes not imply a non-refcounted socket.\n\nDrop sk's reference in both error paths.\n\nunreferenced object 0xffff888101911800 (size 2048):\n  comm \"test_progs\", pid 44109, jiffies 4297131437\n  hex dump (first 32 bytes):\n    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n    80 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n  backtrace (crc 9336483b):\n    __kmalloc_noprof+0x3bf/0x560\n    __reuseport_alloc+0x1d/0x40\n    reuseport_alloc+0xca/0x150\n    reuseport_attach_prog+0x87/0x140\n    sk_reuseport_attach_bpf+0xc8/0x100\n    sk_setsockopt+0x1181/0x1990\n    do_sock_setsockopt+0x12b/0x160\n    __sys_setsockopt+0x7b/0xc0\n    __x64_sys_setsockopt+0x1b/0x30\n    do_syscall_64+0x93/0x180\n    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Fix bpf_sk_select_reuseport() memory leak","CVE":"CVE-2025-21683","Year":"2025"},"notes":[{"CveYear":"2025","CveId":"21683","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix bpf_sk_select_reuseport() memory leak\n\nAs pointed out in the original comment, lookup in sockmap can return a TCP\nESTABLISHED socket. Such TCP socket may have had SO_ATTACH_REUSEPORT_EBPF\nset before it was ESTABLISHED. In other words, a non-NULL sk_reuseport_cb\ndoes not imply a non-refcounted socket.\n\nDrop sk's reference in both error paths.\n\nunreferenced object 0xffff888101911800 (size 2048):\n  comm \"test_progs\", pid 44109, jiffies 4297131437\n  hex dump (first 32 bytes):\n    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n    80 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n  backtrace (crc 9336483b):\n    __kmalloc_noprof+0x3bf/0x560\n    __reuseport_alloc+0x1d/0x40\n    reuseport_alloc+0xca/0x150\n    reuseport_attach_prog+0x87/0x140\n    sk_reuseport_attach_bpf+0xc8/0x100\n    sk_setsockopt+0x1181/0x1990\n    do_sock_setsockopt+0x12b/0x160\n    __sys_setsockopt+0x7b/0xc0\n    __x64_sys_setsockopt+0x1b/0x30\n    do_syscall_64+0x93/0x180\n    entry_SYSCALL_64_after_hwframe+0x76/0x7e","Type":"Description","Title":"bpf: Fix bpf_sk_select_reuseport() memory leak"}]}}}