{"id":11201,"date":"2026-09-04T18:51:45","date_gmt":"2026-09-04T10:51:45","guid":{"rendered":"https:\/\/www.54iter.cn\/?vuln=cve-2026-74590"},"modified":"2026-09-04T18:51:45","modified_gmt":"2026-09-04T10:51:45","slug":"cve-2026-74590","status":"publish","type":"vuln","link":"https:\/\/www.54iter.cn\/?vuln=cve-2026-74590","title":{"rendered":"CVE-2026-74590 [HIGH] &#8211; In the Linux kernel, the following vulnerability has been resolved:\n\nfsverity: Fix bpf_get"},"content":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>fsverity: Fix bpf_get_fsverity_digest() dynptr assumptions<\/p>\n<p>The BPF verifier and the dynptr abstraction ensure that the memory space<br \/>\nreferenced by a dynptr remains valid.  They do not, however, provide any<br \/>\nguarantee that the contents of the memory are stable.  kfuncs are<br \/>\nexpected to remain memory-safe even if concurrent modifications occur.<\/p>\n<p>bpf_get_fsverity_digest() didn&#8217;t follow that: it could crash if<br \/>\narg-&gt;digest_size was concurrently modified.<\/p>\n<p>Fix that by using the known-good value hash_alg-&gt;digest_size instead.<\/p>\n<p>Also widen &#8216;dynptr_sz&#8217; and &#8216;out_digest_sz&#8217; to u64 to match the return<br \/>\ntype of __bpf_dynptr_size().  It doesn&#8217;t appear that it can actually be<br \/>\nmore than INT_MAX currently (since __bpf_dynptr_data_rw() excludes<br \/>\nfile-based pointers), but the correct type might as well be used.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>fsverity: Fix bpf_get_fsverity_digest() dynptr assumptions<\/p>\n<p>The BPF verifier and the dynptr abstraction ensure that the memory spac<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-11201","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/11201","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=11201"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=11201"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=11201"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}