CVE-2026-98059

In the Linux kernel, the following vulnerability has been resolved:

bpf: Mark sched_process_wait argument as nullable

do_wait() passes wo->wo_pid to the sched_process_wait tracepoint.

kernel_wait4() leaves wo_pid NULL for wait4(-1), and

kernel_waitid_prepare() does likewise for waitid(P_ALL).

btf_ctx_access() currently types argument 0 as PTR_TO_BTF_ID |

PTR_TRUSTED. Without PTR_MAYBE_NULL, the verifier accepts an unchecked

dereference. Trusted pointer loads have no fault protection, so a wait for

any child can then cause a NULL pointer dereference in JITed BPF code.

Add sched_process_wait to raw_tp_null_args[] with argument 0 marked

nullable. The verifier rejects an unchecked dereference while preserving

access after the program checks the pointer for NULL.