ghsa-935c-5v3p-3rp4
Vulnerability from github
In the Linux kernel, the following vulnerability has been resolved:
btrfs: fix the inode leak in btrfs_iget()
[BUG] There is a bug report that a syzbot reproducer can lead to the following busy inode at unmount time:
BTRFS info (device loop1): last unmount of filesystem 1680000e-3c1e-4c46-84b6-56bd3909af50 VFS: Busy inodes after unmount of loop1 (btrfs) ------------[ cut here ]------------ kernel BUG at fs/super.c:650! Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI CPU: 0 UID: 0 PID: 48168 Comm: syz-executor Not tainted 6.15.0-rc2-00471-g119009db2674 #2 PREEMPT(full) Hardware name: QEMU Ubuntu 24.04 PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:generic_shutdown_super+0x2e9/0x390 fs/super.c:650 Call Trace: kill_anon_super+0x3a/0x60 fs/super.c:1237 btrfs_kill_super+0x3b/0x50 fs/btrfs/super.c:2099 deactivate_locked_super+0xbe/0x1a0 fs/super.c:473 deactivate_super fs/super.c:506 [inline] deactivate_super+0xe2/0x100 fs/super.c:502 cleanup_mnt+0x21f/0x440 fs/namespace.c:1435 task_work_run+0x14d/0x240 kernel/task_work.c:227 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:114 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x269/0x290 kernel/entry/common.c:218 do_syscall_64+0xd4/0x250 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f
[CAUSE] When btrfs_alloc_path() failed, btrfs_iget() directly returned without releasing the inode already allocated by btrfs_iget_locked().
This results the above busy inode and trigger the kernel BUG.
[FIX] Fix it by calling iget_failed() if btrfs_alloc_path() failed.
If we hit error inside btrfs_read_locked_inode(), it will properly call iget_failed(), so nothing to worry about.
Although the iget_failed() cleanup inside btrfs_read_locked_inode() is a break of the normal error handling scheme, let's fix the obvious bug and backport first, then rework the error handling later.
{
"affected": [],
"aliases": [
"CVE-2025-37904"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-05-20T16:15:26Z",
"severity": null
},
"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\u0027s fix the obvious bug\nand backport first, then rework the error handling later.",
"id": "GHSA-935c-5v3p-3rp4",
"modified": "2025-05-20T18:30:54Z",
"published": "2025-05-20T18:30:54Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-37904"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/30a339bece3a44ab0a821477139e84fb86af9761"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/48c1d1bb525b1c44b8bdc8e7ec5629cb6c2b9fc4"
}
],
"schema_version": "1.4.0",
"severity": []
}
Sightings
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