{"id":41062,"date":"2026-10-19T00:31:59","date_gmt":"2026-10-18T16:31:59","guid":{"rendered":"https:\/\/www.54iter.cn\/?vuln=cve-2026-98590"},"modified":"2026-10-19T00:31:59","modified_gmt":"2026-10-18T16:31:59","slug":"cve-2026-98590","status":"publish","type":"vuln","link":"https:\/\/www.54iter.cn\/?vuln=cve-2026-98590","title":{"rendered":"CVE-2026-98590 &#8211; In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix bpf_sock con"},"content":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>bpf: Fix bpf_sock context code generation<\/p>\n<p>Currently, the ctx access code reads the rx_queue_mapping<br \/>\nfield with either a 4-byte or 2-byte load. The rest of the bits<br \/>\nin the register are marked known zero by the verifier. However,<br \/>\nthe emitted ctx access code places in the register on certain<br \/>\nthe special value (-1) using BPF_MOV_IMM64, which gets sign-extended<br \/>\nto turn on all the bits in the register. By shifting this value right,<br \/>\nthe program ends up with a value at runtime above what the verifier<br \/>\nassumes is possible.<\/p>\n<p>Fix this by ensuring the read value is as wide as the assumed size.<br \/>\nUse MOV32 instructions instead of MOV64 instructions to keep<br \/>\nthe upper bits zero as assumed by the verifier. Also properly report<br \/>\nthe size of the destination variable (the bpf_sock field, 4 bytes) instead<br \/>\nof the source (the socket field, 2 bytes).<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>bpf: Fix bpf_sock context code generation<\/p>\n<p>Currently, the ctx access code reads the rx_queue_mapping<br \/>\nfield with either a 4-byte or <\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-41062","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/41062","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=41062"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=41062"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=41062"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}