{"id":"DEBIAN-CVE-2026-74348","details":"In the Linux kernel, the following vulnerability has been resolved:  ocfs2/dlm: require a ref for locking_state debugfs open  debug_lockres_open() copies inode-\u003ei_private into struct debug_lockres and debug_lockres_release() later drops that pointer with dlm_put().  That only works if open successfully pins the struct dlm_ctxt.  Today open calls dlm_grab(dlm) but ignores its return value.  Once the last domain unregister has removed the context from dlm_domains, dlm_grab() returns NULL, yet open still stores the raw pointer and returns success.  The later release path is outside the debugfs removal barrier, so it can call dlm_put() after dlm_free_ctxt_mem() has freed the context.  KASAN reports this as a slab-use-after-free in dlm_put() called from debug_lockres_release().  Fail the open when dlm_grab() cannot acquire the reference and unwind the seq_file private state before returning.  That keeps locking_state from handing out a file descriptor whose release path does not own the dlm_ctxt.  The buggy scenario involves two paths, with each column showing the order within that path:  locking_state debugfs open:          last domain unregister: 1. debug_lockres_open() reads        1. dlm_unregister_domain() calls    inode-\u003ei_private.                    dlm_complete_dlm_shutdown(). 2. debug_lockres_open() calls        2. shutdown removes the dlm_ctxt from    dlm_grab(dlm) and gets NULL.         dlm_domains. 3. open still stores the raw dlm     3. final teardown reaches    pointer in dl-\u003edl_ctxt and           dlm_free_ctxt_mem() and frees it.    returns success. 4. debug_lockres_release() later    calls dlm_put(dl-\u003edl_ctxt).  Validation reproduced this kernel report: KASAN slab-use-after-free in dlm_put+0x82/0x200 RIP: 0033:0x7f4d349bc9e0 The buggy address belongs to the object at ffff888103a3c000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 816 bytes inside of freed 2048-byte region [ffff888103a3c000, ffff888103a3c800) Write of size 4 Call trace:   dump_stack_lvl+0x66/0xa0 (?:?)   print_report+0xd0/0x630 (?:?)   dlm_put+0x82/0x200 (?:?)   srso_alias_return_thunk+0x5/0xfbef5 (?:?)   __virt_addr_valid+0x188/0x2f0 (?:?)   kasan_report+0xe4/0x120 (?:?)   kasan_check_range+0x105/0x1b0 (?:?)   debug_lockres_release+0x53/0x80 (fs/ocfs2/dlm/dlmdebug.c:587)   dlm_put+0x9/0x200 (?:?)   debug_lockres_release+0x5c/0x80 (fs/ocfs2/dlm/dlmdebug.c:587)   full_proxy_release+0x67/0x90 (?:?)   __fput+0x1df/0x4b0 (?:?)   do_raw_spin_lock+0x10f/0x1b0 (?:?)   fput_close_sync+0xd2/0x170 (?:?)   __x64_sys_close+0x55/0x90 (?:?)   do_syscall_64+0x10c/0x640 (arch/x86/entry/syscall_64.c:87)   irqentry_exit+0xac/0x6e0 (?:?)   entry_SYSCALL_64_after_hwframe+0x77/0x7f (?:?) Freed by task stack:   kasan_save_stack+0x33/0x60 (?:?)   kasan_save_track+0x14/0x30 (?:?)   kasan_save_free_info+0x3b/0x60 (?:?)   __kasan_slab_free+0x5f/0x80 (?:?)   kfree+0x30f/0x580 (?:?)   dlm_put+0x1ce/0x200 (?:?)   dlm_unregister_domain+0xf6/0xb30 (?:?)   o2cb_cluster_disconnect+0x6b/0x90 (?:?)   ocfs2_cluster_disconnect+0x41/0x70 (?:?)   ocfs2_dlm_shutdown+0x1c4/0x220 (?:?)   ocfs2_dismount_volume+0x38a/0x550 (?:?)   generic_shutdown_super+0xc3/0x220 (?:?)   kill_block_super+0x29/0x60 (?:?)   deactivate_locked_super+0x66/0xe0 (?:?)   cleanup_mnt+0x13d/0x210 (?:?)   task_work_run+0xfa/0x170 (?:?)   exit_to_user_mode_loop+0xd6/0x430 (?:?)   do_syscall_64+0x3cb/0x640 (arch/x86/entry/syscall_64.c:87)   entry_SYSCALL_64_after_hwframe+0x77/0x7f (?:?)","modified":"2026-10-01T01:03:43.663880179Z","published":"2026-08-15T06:22:35.970Z","upstream":["CVE-2026-74348"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-74348"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.180-1"}]}],"versions":["6.1.106-1","6.1.106-2","6.1.106-3","6.1.112-1","6.1.115-1","6.1.119-1","6.1.123-1","6.1.124-1","6.1.128-1","6.1.129-1","6.1.133-1","6.1.135-1","6.1.137-1","6.1.139-1","6.1.140-1","6.1.147-1","6.1.148-1","6.1.153-1","6.1.158-1","6.1.159-1","6.1.162-1","6.1.164-1","6.1.170-1","6.1.170-2","6.1.170-3","6.1.172-1","6.1.174-1","6.1.176-1","6.1.177-1","6.1.27-1","6.1.37-1","6.1.38-1","6.1.38-2","6.1.38-2~bpo11+1","6.1.38-3","6.1.38-4","6.1.38-4~bpo11+1","6.1.52-1","6.1.55-1","6.1.55-1~bpo11+1","6.1.64-1","6.1.66-1","6.1.67-1","6.1.69-1","6.1.69-1~bpo11+1","6.1.76-1","6.1.76-1~bpo11+1","6.1.82-1","6.1.85-1","6.1.90-1","6.1.90-1~bpo11+1","6.1.94-1","6.1.94-1~bpo11+1","6.1.98-1","6.1.99-1"],"ecosystem_specific":{"urgency":"not 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