{"id":21447,"date":"2026-09-12T04:31:12","date_gmt":"2026-09-11T20:31:12","guid":{"rendered":"https:\/\/www.54iter.cn\/?vuln=cve-2026-89525"},"modified":"2026-09-12T04:31:12","modified_gmt":"2026-09-11T20:31:12","slug":"cve-2026-89525","status":"publish","type":"vuln","link":"https:\/\/www.54iter.cn\/?vuln=cve-2026-89525","title":{"rendered":"CVE-2026-89525 &#8211; In the Linux kernel, the following vulnerability has been resolved:\n\nudf: reject VAT index"},"content":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>udf: reject VAT indexes equal to the entry count<\/p>\n<p>UDF 1.50 virtual partition mapping uses the VAT as an array of physical<br \/>\nblock mappings. s_num_entries stores the number of entries in that array,<br \/>\nnot the highest valid index. The valid VAT indexes are therefore below<br \/>\ns_num_entries.<\/p>\n<p>udf_get_pblock_virt15() currently rejects only indexes greater than<br \/>\ns_num_entries. A crafted image can request index s_num_entries, pass the<br \/>\nbounds check, and make the kernel read one entry past the allocated VAT table.<\/p>\n<p>Change the check to reject block &gt;= s_num_entries, so the count is handled as<br \/>\nan exclusive upper bound.<\/p>\n<p>A crafted UDF image reproduced this on origin\/master commit<br \/>\n0e35b9b6ec0ffcc5e23cbdec09f5c622ad532b53 with a KASAN slab-out-of-bounds<br \/>\nreport in udf_get_pblock_virt15().<\/p>\n<p>Trail of Bits has a reproducer that triggers kernel panic demonstrating the bug, and can share it if needed.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>udf: reject VAT indexes equal to the entry count<\/p>\n<p>UDF 1.50 virtual partition mapping uses the VAT as an array of physical<br \/>\nblock map<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-21447","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/21447","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=21447"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=21447"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=21447"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}