CVE-2026-64575bpf: tcp: fix double sock release on batch realloc

Official description

In the Linux kernel, the following vulnerability has been resolved: bpf: tcp: fix double sock release on batch realloc bpf_iter_tcp_batch() releases the current batch via bpf_iter_tcp_put_batch(), which drops the socket refs and rewrites each slot with the socket cookie, then grows the batch. cur_sk/end_sk are kept for bpf_iter_tcp_resume(), but on realloc failure the function returns ERR_PTR() before resume runs, leaving cur_sk < end_sk over slots that now hold cookies rather than sock pointers. bpf_iter_tcp_seq_stop() then calls bpf_iter_tcp_put_batch() again and dereferences a cookie as a struct sock. Empty the batch on the failure path so stop() does not release it again. The sockets were already freed by the first bpf_iter_tcp_put_batch(), so nothing leaks, and a later read() rescans the bucket from the start instead of skipping it. The sibling GFP_NOWAIT failure path still holds real socket references and is left for stop() to release. BUG: KASAN: null-ptr-deref in __sock_gen_cookie Read of size 8 at addr 0000000000000059 by task exploit ... __sock_gen_cookie (net/core/sock_diag.c:28) bpf_iter_tcp_put_batch (net/ipv4/tcp_ipv4.c:2918) bpf_iter_tcp_seq_stop (net/ipv4/tcp_ipv4.c:3270) bpf_seq_read (kernel/bpf/bpf_iter.c:205) vfs_read (fs/read_write.c:572) ksys_read (fs/read_write.c:716) do_syscall_64 entry_SYSCALL_64_after_hwframe Kernel panic - not syncing: Fatal exception

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/c842882e4c5d2818b858d6baf3fd10958c93f729
• https://git.kernel.org/stable/c/7a6a6d2a127866935f87b55b557bc89693065462
• https://git.kernel.org/stable/c/f0c1810320b0dac228103fad7311e89532134d83
• https://git.kernel.org/stable/c/9f27c4f0ae35b5390ce4f7a54d3501144e41a54d
• https://git.kernel.org/stable/c/8a726e9585ffe7bfbfad2b5279277a00973970f3
• https://git.kernel.org/stable/c/980a813452754f8001704744e92f7aa697c53dd3