CVE-2026-97594

*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> landlock: Fix use-after-free of the source&amp;#39;s parent directory<br /> <br /> current_check_refer_path() reads old_dentry-&gt;d_parent without holding a<br /> reference nor a lock on it, and then dereferences it in<br /> collect_domain_accesses() and in the audit record.<br /> <br /> A reference on a child does not pin its parent: __d_move() reassigns<br /> dentry-&gt;d_parent and drops the reference the child held on its former<br /> parent. hook_path_rename() is not affected because the rename path<br /> calls lock_rename() before the hook, so the source cannot be reparented<br /> under it. hook_path_link() has no such protection: filename_linkat()<br /> holds a reference on the source dentry but neither locks nor references<br /> its parent, so a concurrent rename(2) can reparent the source while<br /> security_path_link() runs, and the former parent can then be removed and<br /> freed while the hook walks it.<br /> <br /> A process can trigger this after entering a Landlock domain that handles<br /> at least one filesystem access right. The process can then race a<br /> linkat(2) loop against rename(2) and rmdir(2):<br /> <br /> BUG: KASAN: slab-use-after-free in collect_domain_accesses+0x278/0x290<br /> Read of size 4 at addr ffff888160bd53f4 by task llrepro2/549<br /> collect_domain_accesses+0x278/0x290<br /> current_check_refer_path+0x952/0x1120<br /> security_path_link+0x1be/0x320<br /> filename_linkat+0x342/0x6d0<br /> __x64_sys_linkat+0xfa/0x150<br /> Freed by task 562:<br /> kmem_cache_free+0x139/0x4c0<br /> i_callback+0x4b/0x80<br /> rcu_core+0x7dc/0x10a0<br /> <br /> Take a reference on the dentry selected as the source parent, using<br /> dget() for the common-mount-root case and dget_parent() otherwise.<br /> Release it after the hierarchy walk and synchronous audit logging.<br /> <br /> [mic: Clarify the caller, reachability, and reference handling]