{"id":"AZL-104747","summary":"CVE-2026-97594 affecting package kernel 6.6.157.1-1","details":"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-\u003ed_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-\u003ed_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]","modified":"2026-09-27T05:34:32Z","published":"2026-09-25T11:17:10Z","upstream":["CVE-2026-97594"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-97594"}],"affected":[{"package":{"name":"kernel","ecosystem":"Azure Linux:3","purl":"pkg:rpm/azure-linux/kernel"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"6.6.157.1-1"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-104747.json"}}],"schema_version":"1.9.0"}