{"id":41127,"date":"2026-10-19T00:32:16","date_gmt":"2026-10-18T16:32:16","guid":{"rendered":"https:\/\/www.54iter.cn\/?vuln=cve-2026-98655"},"modified":"2026-10-19T00:32:16","modified_gmt":"2026-10-18T16:32:16","slug":"cve-2026-98655","status":"publish","type":"vuln","link":"https:\/\/www.54iter.cn\/?vuln=cve-2026-98655","title":{"rendered":"CVE-2026-98655 &#8211; In the Linux kernel, the following vulnerability has been resolved:\n\nperf: Require kernel"},"content":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>perf: Require kernel access for text poke events<\/p>\n<p>Perf events with exclude_kernel=1 can be opened without kernel perf<br \/>\naccess. However, exclude_kernel does not suppress text-poke sideband<br \/>\nrecords. Every PERF_RECORD_TEXT_POKE is marked PERF_RECORD_MISC_KERNEL<br \/>\nand contains a raw kernel instruction address.<\/p>\n<p>An unprivileged task can therefore open and mmap a task-local software<br \/>\nevent with text_poke=1. Both opening a count-only tracepoint event and<br \/>\nconfiguring UDP GRO for ESP-in-UDP cause updates to inline static calls;<br \/>\nthe observer receives the relocated addresses of the modified instructions.<br \/>\nFor a known kernel image, any such address reveals the runtime kernel<br \/>\ntext base despite KASLR.<\/p>\n<p>Call perf_allow_kernel() whenever attr.text_poke is set, regardless of<br \/>\nexclude_kernel. Events that neither monitor kernel execution nor request<br \/>\ntext-poke records retain their existing permissions.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>perf: Require kernel access for text poke events<\/p>\n<p>Perf events with exclude_kernel=1 can be opened without kernel perf<br \/>\naccess. Howev<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-41127","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/41127","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=41127"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=41127"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=41127"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}