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
2026-07-06
AI Q&A
2025-12-24
EPSS Evaluated
2026-07-05
NVD
CVE-2023-54124

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *

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Exploitability

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CWE ID Description
CWE-UNKNOWN

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Executive Summary

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.

Impact Analysis

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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