CVE-2026-98058 bpf: Mark syscall helpers as sleepable

In the Linux kernel, the following vulnerability has been resolved: bpf: Mark syscall helpers as sleepable bpfsysbpf executes the bpf2 syscall body, which can take mutexes, allocate with GFPKERNEL, and wait for an RCU grace period. bpfsysclose reaches closefd and filpclose, which can sleep as wel...