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.