{"id":15028,"date":"2026-09-04T19:02:22","date_gmt":"2026-09-04T11:02:22","guid":{"rendered":"https:\/\/www.54iter.cn\/?vuln=cve-2026-64036"},"modified":"2026-09-04T19:02:22","modified_gmt":"2026-09-04T11:02:22","slug":"cve-2026-64036","status":"publish","type":"vuln","link":"https:\/\/www.54iter.cn\/?vuln=cve-2026-64036","title":{"rendered":"CVE-2026-64036 [HIGH] &#8211; In the Linux kernel, the following vulnerability has been resolved:\n\ncgroup\/rstat: validat"},"content":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>cgroup\/rstat: validate cpu before css_rstat_cpu() access<\/p>\n<p>css_rstat_updated() is exposed as a BPF kfunc and accepts a<br \/>\ncaller-provided cpu argument. The function uses cpu for per-cpu rstat<br \/>\nlookups without checking whether it refers to a valid possible CPU.<\/p>\n<p>A BPF iter\/cgroup program with CAP_BPF and CAP_PERFMON can pass an<br \/>\ninvalid cpu value. On an unfixed UBSCAN_BOUNDS test kernel, cpu ==<br \/>\n0x7fffffff triggers:<\/p>\n<p>  UBSAN: array-index-out-of-bounds in kernel\/cgroup\/rstat.c:31:9<br \/>\n  index 2147483647 is out of range for type &#8216;long unsigned int [64]&#8217;<br \/>\n  Call Trace:<br \/>\n    css_rstat_updated<br \/>\n    bpf_iter_run_prog<br \/>\n    cgroup_iter_seq_show<br \/>\n    bpf_seq_read<\/p>\n<p>Add cpu validation to the BPF-facing css_rstat_updated() kfunc and<br \/>\nmove the common implementation to __css_rstat_updated() for in-kernel<br \/>\ncallers.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>cgroup\/rstat: validate cpu before css_rstat_cpu() access<\/p>\n<p>css_rstat_updated() is exposed as a BPF kfunc and accepts a<br \/>\ncaller-provid<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-15028","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/15028","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln"}],"about":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/types\/vuln"}],"wp:attachment":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=15028"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=15028"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=15028"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}