{"id":41063,"date":"2026-10-19T00:31:59","date_gmt":"2026-10-18T16:31:59","guid":{"rendered":"https:\/\/www.54iter.cn\/?vuln=cve-2026-98591"},"modified":"2026-10-19T00:31:59","modified_gmt":"2026-10-18T16:31:59","slug":"cve-2026-98591","status":"publish","type":"vuln","link":"https:\/\/www.54iter.cn\/?vuln=cve-2026-98591","title":{"rendered":"CVE-2026-98591 &#8211; In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix bounds check"},"content":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>bpf: Fix bounds check for skb-backed dynptrs<\/p>\n<p>The skb_pointer_if_linear() function checks whether a<br \/>\nmemory region of length len starting at offset off into<br \/>\nthe skb is in the linear area, and returns a pointer to<br \/>\nthe region if so. The check currently subtracts between<br \/>\nskb_headlen and offset of the check, and since skb_headlen<br \/>\nis unsigned the subtraction can underflow. This causes the<br \/>\nbounds check to spuriously pass and generate an arbitrary<br \/>\npointer of the form *(skb-&gt;data + off).<\/p>\n<p>The only user of this helper is currently skb-backed BPF<br \/>\ndynptr code. Returning the wrong pointer leads to the<br \/>\ndynptr erroneously being backed with invalid memory.<\/p>\n<p>Ensure the subtraction cannot underflow, and fail the check if<br \/>\nit would. Use u64 arithmetic to also prevent overflow when<br \/>\ncalculating (skb_headlen(skb) &#8211; off) since off is unsigned.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>bpf: Fix bounds check for skb-backed dynptrs<\/p>\n<p>The skb_pointer_if_linear() function checks whether a<br \/>\nmemory region of length len sta<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-41063","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/41063","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=41063"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=41063"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=41063"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}