{"id":28533,"date":"2026-09-25T00:31:36","date_gmt":"2026-09-24T16:31:36","guid":{"rendered":"https:\/\/www.54iter.cn\/?vuln=cve-2026-93269"},"modified":"2026-09-25T00:31:36","modified_gmt":"2026-09-24T16:31:36","slug":"cve-2026-93269","status":"publish","type":"vuln","link":"https:\/\/www.54iter.cn\/?vuln=cve-2026-93269","title":{"rendered":"CVE-2026-93269 &#8211; In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix circular lo"},"content":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>ext4: fix circular lock dependency in ext4_ext_migrate<\/p>\n<p>Move iput(tmp_inode) after ext4_writepages_up_write() to avoid a<br \/>\ncircular lock dependency between s_writepages_rwsem and sb_internal<br \/>\n(freeze protection).<\/p>\n<p>The deadlock scenario:<\/p>\n<p>  CPU0 (EXT4_IOC_MIGRATE)        CPU1 (orphan cleanup during mount)<br \/>\n  &#8212;-                           &#8212;-<br \/>\n  ext4_ext_migrate()<br \/>\n    ext4_writepages_down_write()<br \/>\n      s_writepages_rwsem (write)<br \/>\n                                 ext4_evict_inode()<br \/>\n                                   sb_start_intwrite()   [sb_internal]<br \/>\n                                   &#8230;<br \/>\n                                     ext4_writepages()<br \/>\n                                       s_writepages_rwsem (read) [BLOCKED]<br \/>\n    iput(tmp_inode)<br \/>\n      ext4_evict_inode()<br \/>\n        sb_start_intwrite()         [BLOCKED]<\/p>\n<p>The tmp_inode is a temporary inode with nlink=0 created solely for<br \/>\nbuilding the extent tree.  Its eviction does not require<br \/>\ns_writepages_rwsem protection, so deferring iput() until after<br \/>\nreleasing the rwsem is safe.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>ext4: fix circular lock dependency in ext4_ext_migrate<\/p>\n<p>Move iput(tmp_inode) after ext4_writepages_up_write() to avoid a<br \/>\ncircular l<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-28533","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/28533","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=28533"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=28533"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=28533"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}