CVE-2026-64036 cgroup/rstat: validate cpu before css_rstat_cpu() access

In the Linux kernel, the following vulnerability has been resolved: cgroup/rstat: validate cpu before cssrstatcpu access cssrstatupdated is exposed as a BPF kfunc and accepts a caller-provided cpu argument. The function uses cpu for per-cpu rstat lookups without checking whether it refers to a...

CVE-2026-64036

The CVE-2026-64036 issue affects the Linux kernel cgroup/rstat path. The vuln arises because css_rstat_updated(), a BPF kfunc, accepts a caller-provided cpu value used for per-cpu rstat lookups without validating it against a valid CPU. A BPF iter/cgroup program with CAP_BPF and CAP_PERFMON could...