{"id":17359,"date":"2026-09-05T02:31:02","date_gmt":"2026-09-04T18:31:02","guid":{"rendered":"https:\/\/www.54iter.cn\/?vuln=cve-2026-80855"},"modified":"2026-09-05T02:31:02","modified_gmt":"2026-09-04T18:31:02","slug":"cve-2026-80855","status":"publish","type":"vuln","link":"https:\/\/www.54iter.cn\/?vuln=cve-2026-80855","title":{"rendered":"CVE-2026-80855 &#8211; In the Linux kernel, the following vulnerability has been resolved:\n\nfuse: fix invalidate"},"content":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>fuse: fix invalidate lock leak on open O_TRUNC DAX failure<\/p>\n<p>fuse_open() takes filemap_invalidate_lock() for a DAX truncate<br \/>\n(dax_truncate = true) and releases it before the out_inode_unlock<br \/>\nlabel.  But when fuse_dax_break_layouts() fails, the goto<br \/>\nout_inode_unlock skips the unlock and leaks the rwsem, so any later<br \/>\nfault or truncate on the file stalls on the stale lock.<\/p>\n<p>fuse_dax_break_layouts() can fail with -ERESTARTSYS when a signal<br \/>\ninterrupts the wait for busy DAX pages to drain:<\/p>\n<p>  open(&#8220;file&#8221;, O_RDWR | O_TRUNC)<br \/>\n  \u2514\u2500 fuse_open()<br \/>\n     \u251c\u2500 filemap_invalidate_lock()        # dax_truncate<br \/>\n     \u2514\u2500 fuse_dax_break_layouts()<br \/>\n        \u2514\u2500 dax_break_layout()<br \/>\n           \u2514\u2500 wait_page_idle()           # TASK_INTERRUPTIBLE<br \/>\n              \u2514\u2500 fuse_wait_dax_page()    # unlock, schedule, re-lock<br \/>\n                 \u2514\u2500 signal \u2192 -ERESTARTSYS<br \/>\n     goto out_inode_unlock               # &lt;- lock leaked<\/p>\n<p>Fix this by moving filemap_invalidate_unlock() below the label so<br \/>\nthat all error paths release the lock, and rename the label to<br \/>\nout_unlock as it now covers more than just the inode lock.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>fuse: fix invalidate lock leak on open O_TRUNC DAX failure<\/p>\n<p>fuse_open() takes filemap_invalidate_lock() for a DAX truncate<br \/>\n(dax_tru<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-17359","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/17359","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=17359"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=17359"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=17359"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}