{"id":"CVE-2026-68096","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-68096","summary":"audit: fix recursive locking deadlock in audit_dupe_exe()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\naudit: fix recursive locking deadlock in audit_dupe_exe()\n\nA deadlock occurs in the audit subsystem when duplicating\nexecutable-related rules.\n\nWhen a file is moved (e.g., via do_renameat2()), the VFS layer locks\nthe parent directory (I_MUTEX_PARENT), which synchronously triggers an\nfsnotify_move event. If an existing executable audit rule matches the\nfile being moved, the audit subsystem catches this event and calls\naudit_dupe_exe() to duplicate the watch and update the rule. Then,\naudit_alloc_mark() would call kern_path_parent() to resolve the path,\nleading to a blind attempt to acquire the exact same I_MUTEX_PARENT lock\nalready held by the task, resulting in the following recursive locking\ndeadlock:\n\n ============================================\n WARNING: possible recursive locking detected\n 6.12.0-55.27.1.el10_0.x86_64+debug #1 Not tainted\n --------------------------------------------\n mv/5099 is trying to acquire lock:\n ffff888132845358 (&inode->i_sb->s_type->i_mutex_dir_key/1){+.+.}-{3:3},\n at: __kern_path_locked+0x10a/0x2f0\n\n but task is already holding lock:\n ffff888132846b58 (&inode->i_sb->s_type->i_mutex_dir_key/1){+.+.}-{3:3},\n at: lock_two_directories+0x13f/0x2b0\n\n other info that might help us debug this:\n  Possible unsafe locking scenario:\n\n        CPU0\n        ----\n   lock(&inode->i_sb->s_type->i_mutex_dir_key/1);\n   lock(&inode->i_sb->s_type->i_mutex_dir_key/1);\n\n  *** DEADLOCK ***\n\n  May be due to missing lock nesting notation\n\n  6 locks held by mv/5099:\n  #0: ffff888112a9c440 (sb_writers#13)\n  at: do_renameat2+0x34c/0xbc0\n  #1: ffff888112a9c790 (&type->s_vfs_rename_key#3)\n  at: do_renameat2+0x415/0xbc0\n  #2: ffff888132846b58 (&inode->i_sb->s_type->i_mutex_dir_key/1)\n  at: lock_two_directories+0x13f/0x2b0\n  #3: ffff888132845358 (&inode->i_sb->s_type->i_mutex_dir_key/5)\n  at: lock_two_directories+0x175/0x2b0\n  #4: ffffffffb3a1fb10 (&fsnotify_mark_srcu)\n  at: fsnotify+0x454/0x28a0\n  #5: ffffffffaf886230 (audit_filter_mutex)\n  at: audit_update_watch+0x36/0x11e0\n\n stack backtrace:\n Call Trace:\n  <TASK>\n  dump_stack_lvl+0x6f/0xb0\n  print_deadlock_bug.cold+0xbd/0xca\n  validate_chain+0x83a/0xf00\n  __lock_acquire+0xcac/0x1d20\n  lock_acquire.part.0+0x11b/0x360\n  down_write_nested+0x9f/0x230\n  __kern_path_locked+0x10a/0x2f0\n  kern_path_locked+0x26/0x40\n  audit_alloc_mark+0xfb/0x4f0\n  audit_dupe_exe+0x6c/0xe0\n  audit_dupe_rule+0x6c2/0xc00\n  audit_update_watch+0x4cc/0x11e0\n  audit_watch_handle_event+0x12c/0x1b0\n  send_to_group+0x5d0/0x8b0\n  fsnotify+0x615/0x28a0\n  fsnotify_move+0x1d8/0x630\n  vfs_rename+0xdcd/0x1df0\n  do_renameat2+0x9d4/0xbc0\n  __x64_sys_renameat+0x192/0x260\n  do_syscall_64+0x92/0x180\n  entry_SYSCALL_64_after_hwframe+0x76/0x7e\n RIP: 0033:0x7f0491fe8c4e\n Code: 0f 1f 40 00 48 8b 15 c1 e1 16 00 f7 d8 64 89 02 b8 ff ff ff ff\n c3 66 0f 1f 44 00 00 f3 0f 1e fa 49 89 ca b8 08 01 00 00 0f 05 <48>\n 3d 00 f0 ff ff 77 0a c3 66 0f 1f 84 00 00 00 00 00 48 8b 15 89\n RSP: 002b:00007ffc7210bf38 EFLAGS: 00000246 ORIG_RAX: 0000000000000108\n RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f0491fe8c4e\n RDX: 0000000000000003 RSI: 00007ffc7210e6c8 RDI: 00000000ffffff9c\n RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000001\n R10: 00005575eb2dae2a R11: 0000000000000246 R12: 00005575eb2dae2a\n R13: 00007ffc7210e6c8 R14: 0000000000000003 R15: 00000000ffffff9c\n  </TASK>\n\nThe aforementioned deadlock can be consistently reproduced by running\nthe script below:\n\n audit-dupe-exe-deadlock.sh\n --------------------------\n #!/bin/bash\n auditctl -D\n mkdir -p /tmp/foo\n touch /tmp/file\n auditctl -a always,exit -F exe=/tmp/file -F path=/tmp/file -S all -k dr\n mv /tmp/file /tmp/foo/file\n rm -Rf /tmp/foo\n\nThis patch fixes the issue by introducing struct audit_watch_ctx to pass\nthe fsnotify event context down to audit_alloc_mark(). By utilizing the\nalready-resolved directory inode provided by the event, we bypass the\nkern_path_parent() path resol\n---truncated---","published":"2026-08-10T11:58:09.951Z","modified":"2026-08-14T04:03:54.806757840Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"Linux","name":"Kernel","fixedVersion":"6.6.148"}],"fix":null,"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/36eb77f14b4e6f2dc1008c1fabe31236397be27a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3b601938314c24fcd1afb6659cad92fe96c9c2f8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/40879c39d6740f3dddfb52b5d6ba7fb8cceb84d8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7d1f66c69898ffb1a718926c32a777ecc471caca"},{"type":"WEB","url":"https://git.kernel.org/stable/c/81905b5acbe77284734438df3fbec1158e6429a3"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68096.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-68096"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-14T04:03:54.806757840Z"}}