# CVE-2025-71107: f2fs: ensure node page reads complete before f2fs_put_super() finishes

CVE-2025-71107 is fixed in linux on 1 platform, first by DEBIAN-CVE-2025-71107, released January 14, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2025-71107
- Priority: Routine
- CVSS: 5.5 (Moderate)
- EPSS: 0.0019
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jan 14, 2026
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-71107

## Description

In the Linux kernel, the following vulnerability has been resolved:  f2fs: ensure node page reads complete before f2fs_put_super() finishes  Xfstests generic/335, generic/336 sometimes crash with the following message:  F2FS-fs (dm-0): detect filesystem reference count leak during umount, type: 9, count: 1 ------------[ cut here ]------------ kernel BUG at fs/f2fs/super.c:1939! Oops: invalid opcode: 0000 [#1] SMP NOPTI CPU: 1 UID: 0 PID: 609351 Comm: umount Tainted: G        W           6.17.0-rc5-xfstests-g9dd1835ecda5 #1 PREEMPT(none) Tainted: [W]=WARN Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:f2fs_put_super+0x3b3/0x3c0 Call Trace:  <TASK>  generic_shutdown_super+0x7e/0x190  kill_block_super+0x1a/0x40  kill_f2fs_super+0x9d/0x190  deactivate_locked_super+0x30/0xb0  cleanup_mnt+0xba/0x150  task_work_run+0x5c/0xa0  exit_to_user_mode_loop+0xb7/0xc0  do_syscall_64+0x1ae/0x1c0  entry_SYSCALL_64_after_hwframe+0x76/0x7e  </TASK> ---[ end trace 0000000000000000 ]---  It appears that sometimes it is possible that f2fs_put_super() is called before all node page reads are completed. Adding a call to f2fs_wait_on_all_pages() for F2FS_RD_NODE fixes the problem.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.12.69-1 | [DEBIAN-CVE-2025-71107](https://patchblox.com/security/data/fix/linux/debian-cve-2025-71107.md) | Jan 14, 2026 |
| Linux | linux Debian 14 | 6.18.3-1 | [DEBIAN-CVE-2025-71107](https://patchblox.com/security/data/fix/linux/debian-cve-2025-71107.md) | Jan 14, 2026 |

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Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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