{"cve":"CVE-2026-97594","nvd":{"published":"2026-09-25T11:17:10.653","modified":"2026-10-21T13:21:14.293","status":"Received","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nlandlock: Fix use-after-free of the source's parent directory\n\ncurrent_check_refer_path() reads old_dentry->d_parent without holding a\nreference nor a lock on it, and then dereferences it in\ncollect_domain_accesses() and in the audit record.\n\nA reference on a child does not pin its parent: __d_move() reassigns\ndentry->d_parent and drops the reference the child held on its former\nparent.  hook_path_rename() is not affected because the rename path\ncalls lock_rename() before the hook, so the source cannot be reparented\nunder it.  hook_path_link() has no such protection: filename_linkat()\nholds a reference on the source dentry but neither locks nor references\nits parent, so a concurrent rename(2) can reparent the source while\nsecurity_path_link() runs, and the former parent can then be removed and\nfreed while the hook walks it.\n\nA process can trigger this after entering a Landlock domain that handles\nat least one filesystem access right.  The process can then race a\nlinkat(2) loop against rename(2) and rmdir(2):\n\n  BUG: KASAN: slab-use-after-free in collect_domain_accesses+0x278/0x290\n  Read of size 4 at addr ffff888160bd53f4 by task llrepro2/549\n   collect_domain_accesses+0x278/0x290\n   current_check_refer_path+0x952/0x1120\n   security_path_link+0x1be/0x320\n   filename_linkat+0x342/0x6d0\n   __x64_sys_linkat+0xfa/0x150\n  Freed by task 562:\n   kmem_cache_free+0x139/0x4c0\n   i_callback+0x4b/0x80\n   rcu_core+0x7dc/0x10a0\n\nTake a reference on the dentry selected as the source parent, using\ndget() for the common-mount-root case and dget_parent() otherwise.\nRelease it after the hierarchy walk and synchronous audit logging.\n\n[mic: Clarify the caller, reachability, and reference handling]","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8},"cwes":[],"references":["https://git.kernel.org/stable/c/2c6dc792538260a8087ac5b22c31b3b8e47c85d6","https://git.kernel.org/stable/c/379efd2ce8b26fd35feb13ccc2f671ff105a5052","https://git.kernel.org/stable/c/48fc1c74052c956c59d5b16b5e18e0dd36b76aa2","https://git.kernel.org/stable/c/4c37992b9668c4f37aae41dd95c369f7b6009915","https://git.kernel.org/stable/c/ba29c46ccfe3ebadfb8aa18149186c49f84b14f8"],"products":[],"source":"nvd","synced_at":"2026-10-22T16:41:11.231219466+00:00"},"epss":{"cve":"CVE-2026-97594","score":0.00164,"percentile":0.05538,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}