CVE-2026-64548

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> bpf, sockmap: reject overflowing copy + len in bpf_msg_push_data()<br /> <br /> When the scatterlist ring is full or nearly full, bpf_msg_push_data()<br /> enters a copy fallback path and computes copy + len for the page<br /> allocation size. Since len comes from BPF with arg3_type = ARG_ANYTHING<br /> and both are u32, a crafted len can wrap the sum to a small value,<br /> causing an undersized allocation followed by an out-of-bounds memcpy.<br /> <br /> BUG: unable to handle page fault for address: ffffed104089a402<br /> Oops: Oops: 0000 [#1] SMP KASAN NOPTI<br /> Call Trace:<br /> __asan_memcpy (mm/kasan/shadow.c:105)<br /> bpf_msg_push_data (net/core/filter.c:2852 net/core/filter.c:2788)<br /> bpf_prog_9ed8b5711920a7d7+0x2e/0x36<br /> sk_psock_msg_verdict (net/core/skmsg.c:934)<br /> tcp_bpf_sendmsg (net/ipv4/tcp_bpf.c:421 net/ipv4/tcp_bpf.c:584)<br /> __sys_sendto (net/socket.c:2206)<br /> do_syscall_64 (arch/x86/entry/syscall_64.c:94)<br /> entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)<br /> <br /> Add an overflow check before the allocation.