{"id":"CVE-2025-37904","summary":"btrfs: fix the inode leak in btrfs_iget()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix the inode leak in btrfs_iget()\n\n[BUG]\nThere is a bug report that a syzbot reproducer can lead to the following\nbusy inode at unmount time:\n\n  BTRFS info (device loop1): last unmount of filesystem 1680000e-3c1e-4c46-84b6-56bd3909af50\n  VFS: Busy inodes after unmount of loop1 (btrfs)\n  ------------[ cut here ]------------\n  kernel BUG at fs/super.c:650!\n  Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI\n  CPU: 0 UID: 0 PID: 48168 Comm: syz-executor Not tainted 6.15.0-rc2-00471-g119009db2674 #2 PREEMPT(full)\n  Hardware name: QEMU Ubuntu 24.04 PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\n  RIP: 0010:generic_shutdown_super+0x2e9/0x390 fs/super.c:650\n  Call Trace:\n   \u003cTASK\u003e\n   kill_anon_super+0x3a/0x60 fs/super.c:1237\n   btrfs_kill_super+0x3b/0x50 fs/btrfs/super.c:2099\n   deactivate_locked_super+0xbe/0x1a0 fs/super.c:473\n   deactivate_super fs/super.c:506 [inline]\n   deactivate_super+0xe2/0x100 fs/super.c:502\n   cleanup_mnt+0x21f/0x440 fs/namespace.c:1435\n   task_work_run+0x14d/0x240 kernel/task_work.c:227\n   resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]\n   exit_to_user_mode_loop kernel/entry/common.c:114 [inline]\n   exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]\n   __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]\n   syscall_exit_to_user_mode+0x269/0x290 kernel/entry/common.c:218\n   do_syscall_64+0xd4/0x250 arch/x86/entry/syscall_64.c:100\n   entry_SYSCALL_64_after_hwframe+0x77/0x7f\n   \u003c/TASK\u003e\n\n[CAUSE]\nWhen btrfs_alloc_path() failed, btrfs_iget() directly returned without\nreleasing the inode already allocated by btrfs_iget_locked().\n\nThis results the above busy inode and trigger the kernel BUG.\n\n[FIX]\nFix it by calling iget_failed() if btrfs_alloc_path() failed.\n\nIf we hit error inside btrfs_read_locked_inode(), it will properly call\niget_failed(), so nothing to worry about.\n\nAlthough the iget_failed() cleanup inside btrfs_read_locked_inode() is a\nbreak of the normal error handling scheme, let's fix the obvious bug\nand backport first, then rework the error handling later.","modified":"2026-04-02T12:47:37.019275Z","published":"2025-05-20T15:21:38.075Z","related":["SUSE-SU-2026:20555-1","SUSE-SU-2026:20599-1","SUSE-SU-2026:20615-1","openSUSE-SU-2026:20287-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/37xxx/CVE-2025-37904.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/30a339bece3a44ab0a821477139e84fb86af9761"},{"type":"WEB","url":"https://git.kernel.org/stable/c/48c1d1bb525b1c44b8bdc8e7ec5629cb6c2b9fc4"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/37xxx/CVE-2025-37904.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-37904"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"7c855e16ab72596d771355050ffe026e6b99f91c"},{"fixed":"30a339bece3a44ab0a821477139e84fb86af9761"},{"fixed":"48c1d1bb525b1c44b8bdc8e7ec5629cb6c2b9fc4"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-37904.json"}}],"schema_version":"1.7.5"}