{"id":"DEBIAN-CVE-2026-74351","details":"In the Linux kernel, the following vulnerability has been resolved:  ocfs2: rebase copied fsdlm LVB pointers in locking_state  The locking_state debugfs iterator snapshots struct ocfs2_lock_res by value under ocfs2_dlm_tracking_lock and later formats that copy in ocfs2_dlm_seq_show().  That is fine for the inline fields, but the userspace fsdlm stack stores the LVB through lksb_fsdlm.sb_lvbptr.  Once the iterator drops the tracking lock, a copied non-NULL sb_lvbptr still points into the original lockres owner, so teardown can free that container before the debugfs dump walks the raw LVB bytes.  Rebase the copied sb_lvbptr to the copied l_lksb before dumping the raw LVB.  The seq snapshot already carries the inline LVB storage reserved in struct ocfs2_dlm_lksb, so the debugfs reader can dump the copied bytes without borrowing the original lockres lifetime.  The buggy scenario involves two paths, with each column showing the order within that path:  locking_state reader:                  lockres teardown: 1. ocfs2_dlm_seq_start()/next()        1. file release or another owner    copies struct ocfs2_lock_res           teardown reaches 2. ocfs2_dlm_seq_show() formats           ocfs2_lock_res_free()    the copied row                      2. the lockres is removed from the 3. ocfs2_dlm_lvb() follows the            tracking list    copied sb_lvbptr                   3. the owner frees the original                                           lockres container  Validation reproduced this kernel report: KASAN slab-use-after-free in ocfs2_dlm_seq_show+0x1bd/0x430 RIP: 0033:0x7f8ec4b1e29d The buggy address belongs to the object at ffff88810a1e0800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 368 bytes inside of freed 1024-byte region [ffff88810a1e0800, ffff88810a1e0c00) Read of size 1 Call trace:   dump_stack_lvl+0x66/0xa0   print_report+0xce/0x630   ocfs2_dlm_seq_show+0x1bd/0x430 (fs/ocfs2/dlmglue.c:3137)   srso_alias_return_thunk+0x5/0xfbef5   __virt_addr_valid+0x19f/0x330   kasan_report+0xe0/0x110   seq_read_iter+0x29d/0x790   seq_read+0x20a/0x280   find_held_lock+0x2b/0x80   rcu_read_unlock+0x18/0x70   full_proxy_read+0x9e/0xd0   vfs_read+0x12c/0x590   ksys_read+0xd2/0x170   do_user_addr_fault+0x65a/0x890   do_syscall_64+0x115/0x6a0 (arch/x86/entry/syscall_64.c:87)   entry_SYSCALL_64_after_hwframe+0x77/0x7f Allocated by task stack:   kasan_save_stack+0x33/0x60   kasan_save_track+0x14/0x30   __kasan_kmalloc+0xaa/0xb0   ocfs2_file_open+0x13e/0x300   do_dentry_open+0x233/0x7f0   vfs_open+0x5a/0x1b0   path_openat+0x66d/0x1540   do_file_open+0x186/0x2b0   do_sys_openat2+0xce/0x150   __x64_sys_openat+0xd0/0x140   do_syscall_64+0x115/0x6a0 (arch/x86/entry/syscall_64.c:87)   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+0x313/0x590   ocfs2_file_release+0x138/0x260   __fput+0x1df/0x4b0   fput_close_sync+0xd2/0x170   __x64_sys_close+0x55/0x90   do_syscall_64+0x115/0x6a0 (arch/x86/entry/syscall_64.c:87)   entry_SYSCALL_64_after_hwframe+0x77/0x7f","modified":"2026-09-14T16:47:45.104507216Z","published":"2026-08-15T06:22:36.383Z","upstream":["CVE-2026-74351"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-74351"}],"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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