CVE-2026-90211

CVE-2026-90211 affects the Linux kernel on the s390x architecture. The vulnerability resides in the BPF JIT compiler's handling of read-modify-write (RMW) atomics on arena pointers. Specifically, bpf_jit_probe_atomic_pre() leaves probe->reg at -1 (the sentinel from bpf_jit_probe_init()), so wh...