CVE-2023-54124
Unknown Unknown - Not Provided
Deadlock Vulnerability in Linux Kernel f2fs During umount

Publication date: 2025-12-24

Last updated on: 2025-12-24

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: f2fs: fix to drop all dirty pages during umount() if cp_error is set xfstest generic/361 reports a bug as below: f2fs_bug_on(sbi, sbi->fsync_node_num); kernel BUG at fs/f2fs/super.c:1627! RIP: 0010:f2fs_put_super+0x3a8/0x3b0 Call Trace: generic_shutdown_super+0x8c/0x1b0 kill_block_super+0x2b/0x60 kill_f2fs_super+0x87/0x110 deactivate_locked_super+0x39/0x80 deactivate_super+0x46/0x50 cleanup_mnt+0x109/0x170 __cleanup_mnt+0x16/0x20 task_work_run+0x65/0xa0 exit_to_user_mode_prepare+0x175/0x190 syscall_exit_to_user_mode+0x25/0x50 do_syscall_64+0x4c/0x90 entry_SYSCALL_64_after_hwframe+0x72/0xdc During umount(), if cp_error is set, f2fs_wait_on_all_pages() should not stop waiting all F2FS_WB_CP_DATA pages to be writebacked, otherwise, fsync_node_num can be non-zero after f2fs_wait_on_all_pages() causing this bug. In this case, to avoid deadloop in f2fs_wait_on_all_pages(), it needs to drop all dirty pages rather than redirtying them.
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Meta Information
Published
2025-12-24
Last Modified
2025-12-24
Generated
2026-05-07
AI Q&A
2025-12-24
EPSS Evaluated
2026-05-05
NVD
CVE-2023-54124
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *
Helpful Resources
Exploitability
CWE
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CWE ID Description
CWE-UNKNOWN
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AI Powered Q&A
Can you explain this vulnerability to me?

This vulnerability occurs in the Linux kernel's f2fs filesystem during the unmount (umount) process. If a checkpoint error (cp_error) is set, the function f2fs_wait_on_all_pages() incorrectly waits for all F2FS_WB_CP_DATA pages to be written back, which can cause a kernel bug due to a non-zero fsync_node_num after waiting. This leads to a kernel BUG and potential deadlock. The fix involves dropping all dirty pages during umount if cp_error is set, instead of redirtying them, to avoid the deadlock.


How can this vulnerability impact me? :

This vulnerability can cause the Linux kernel to crash (kernel BUG) during the unmounting of an f2fs filesystem if a checkpoint error occurs. This can lead to system instability, potential data loss, or denial of service as the system may deadlock or crash during filesystem operations.


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